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Valvular Heart Disease
Noon Conference
Guidelines Review (Board Questions)
December 2014
Sanjay Verma, MD
Question 1
A 66-year-old patient presents with angina, but no symptoms of heart failure. He has a history of
hypertension, smoking, type 2 diabetes mellitus, and hyperlipidemia. He has a strong family history of
coronary artery disease. A nuclear stress test reveals a positive electrocardiogram (ECG) with stress,
chest pain, and transient ischemic dilation on the stress image.
He undergoes cardiac catheterization and significant three-vessel disease is found. His echocardiogram
reveals an ejection fraction (EF) of 50% and evidence for mitral regurgitation (MR). There is an area of
mild hypokinesia laterally.
Which of the following mitral valve echocardiographic parameters should prompt repair of the mitral
valve in the setting of concomitant coronary artery bypass grafting (CABG) and an ejection fraction (EF)
of 50%?
A.
Mitral valve effective regurgitant orifice (ERO) = 42 mm2
B.
MR vena contracta = 0.4 cm
C.
MR regurgitant fraction = 40%
D.
MR regurgitant volume = 38 cc
Question 1
A 66-year-old patient presents with angina, but no symptoms of heart failure. He has a history of
hypertension, smoking, type 2 diabetes mellitus, and hyperlipidemia. He has a strong family history of
coronary artery disease. A nuclear stress test reveals a positive electrocardiogram (ECG) with stress,
chest pain, and transient ischemic dilation on the stress image.
He undergoes cardiac catheterization and significant three-vessel disease is found. His echocardiogram
reveals an ejection fraction (EF) of 50% and evidence for mitral regurgitation (MR). There is an area of
mild hypokinesia laterally.
Which of the following mitral valve echocardiographic parameters should prompt repair of the mitral
valve in the setting of concomitant coronary artery bypass grafting (CABG) and an ejection fraction (EF)
of 50%?
A.
Mitral valve effective regurgitant orifice (ERO) = 42 mm2
B.
MR vena contracta = 0.4 cm
C.
MR regurgitant fraction = 40%
D.
MR regurgitant volume = 38 cc
Answer 1
• The correct answer is A. Hemodynamically severe valve lesions
should undergo repair or replacement at the time of CABG, even if
presumably asymptomatic. The likelihood of symptoms referable to
severe lesions within 2-3 years of diagnosis is high, and the
reoperative cardiac surgery mortality is greater in that time frame
than the mortality associated with CABG combined with valve
surgery
• The definition of severe MR by echocardiographic criteria includes
vena contracta ≥0.7 cm, regurgitant volume ≥60 cc, regurgitant
fraction ≥50%, or ERO ≥40 mm2. Answer A is thus the only response
that suggests severe MR and warrants concomitant mitral valve
repair with CABG.
•
References
–
Nishimura RA, Otto CM, Bonow RO, et al. 2014 AHA/ACC Guideline for the Management of Patients With Valvular Heart Disease: A Report of
the American College of Cardiology/American Heart Association Task Force on Practice Guidelines. J Am Coll Cardiol 2014;63:e57-185.
Answer 1
Answer 1
Answer 1
Question 2
•
A 74-year-old man presents to the ambulatory clinic for evaluation of dyspnea. He
is a farmer whose symptoms began approximately 2 months ago. His dyspnea
occurs only during moderate or severe levels of exertion, such as baling hay or
carrying 50 lb. sacks of dairy feed in his daily work.
The patient’s medical history consists of treated hypertension, and a remote deep
venous thrombosis that occurred in the setting of knee surgery. Family history is
unremarkable. His current medications are hydrochlorothiazide (25 mg daily) and
metoprolol (25 mg twice daily).
On physical examination, his blood pressure is 132/74 mm Hg and heart rate is 84
bpm. The lungs are clear. Jugular venous pulse is normal. Carotid upstroke is 1+
tardus. The apical impulse is localized and not enlarged. There is a late-peaking
systolic ejection murmur heard best at the right upper sternal border. No systolic
click is present. The aortic component of the second heart sound is auscultated,
but is slightly diminished; the pulmonic component is normal. Peripheral
examination shows no edema. The remainder of the examination is normal.
Question 2
• The patient undergoes a transthoracic echocardiogram
(TTE) with the following results:
–
–
–
–
–
–
–
–
Left ventricular (LV) EF (calculated): 68%
Interventricular septal wall thickness: 13 mm
LV outflow tract diameter: 2.4 cm
LV outflow tract time-velocity integral: 30 cm
Aortic valve time velocity integral: 105 cm
Mean aortic valve gradient: 35 mm Hg
Aortic valve area (AVA): 1.3 cm2
Estimated right ventricular (RV) systolic pressure: 32 mm
Hg
– Cardiac output: 5.5 L/min.
Question 2
The next best step would be which of the
following?
A. Aortic valve calcium score assessment
B. Invasive hemodynamic catheterization
C. Surgical aortic valve replacement
D. Transcatheter aortic valve replacement
E. Dobutamine echocardiogram
Question 2
The next best step would be which of the
following?
A. Aortic valve calcium score assessment
B. Invasive hemodynamic catheterization
C. Surgical aortic valve replacement
D. Transcatheter aortic valve replacement
E. Dobutamine echocardiogram
Answer 2
•
The correct answer is B. The patient presents for evaluation of symptoms of exertional dyspnea.
The physical examination suggests severe aortic stenosis (AS); however, the echocardiogram shows
only moderate AS. In symptomatic patients with a discrepancy between clinical examination and
results of the noninvasive testing, invasive hemodynamic catheterization is indicated to determine
the true severity of the aortic valve lesion (Class I recommendation).
In this patient, echocardiography may have underestimated the AS by poor alignment of the
Doppler probe with the aortic systolic jet (i.e., leading to underestimation of the gradient), and by
sampling the LV outflow tract time velocity integral too close to the aortic valve (i.e., leading to
overestimation of the time velocity integral measurement). Invasive hemodynamic catheterization
is not indicated in patients with concordant results from the clinical examination and
echocardiogram due to the risk of the procedure, particularly in regard to stroke (Class III
recommendation).
Neither surgery nor catheter-based aortic valve replacement would be considered until severe AS is
determined to be present. A dobutamine study is not indicated unless the cardiac output is low.
•
References
– Nishimura RA, Otto CM, Bonow RO, et al. 2014 AHA/ACC Guideline for the Management of Patients With Valvular Heart Disease:
A Report of the American College of Cardiology/American Heart Association Task Force on Practice Guidelines. J Am Coll Cardiol
2014;63:e57-185.
– Omran H, Schmidt H, Hackenbroch M, et al. Silent and apparent cerebral embolism after retrograde catheterisation of the aortic
valve in valvular stenosis: a prospective, randomised study. Lancet 2003;361:1241-6.
– Nishimura RA, Grantham JA, Connolly HM, Schaff HV, Higano ST, Holmes DR Jr. Low-output, low-gradient aortic stenosis in
patients with depressed left ventricular systolic function: the clinical utility of the dobutamine challenge in the catheterization
laboratory. Circulation 2002;106:809-13.
Question 3
• A 54-year-old woman presents to the ambulatory clinic for evaluation of
shortness of breath. She has been followed for mitral stenosis with a
history of rheumatic fever at the age of 14 years. Two months ago, she
began experiencing her symptoms during light exercise, such as jogging
and indoor cycling. The patient works as nurse, and feels that her
symptoms have begun to interfere with her occupation.
A TTE shows normal LV systolic function (EF 65%). Mitral stenosis is
present with a mean mitral gradient of 5 mm Hg and a calculated valve
area of 1.9 cm2 (heart rate 60 bpm). The valve appears pliable with no
commissural calcification (score = 4). She undergoes cardiac
catheterization using catheters placed in the LV and pulmonary capillary
wedge position. The invasively-derived mitral gradient is 12 mm Hg; valve
area is calculated to be 0.9 cm2. Mild pulmonary hypertension (40/20 mm
Hg) is present. Coronary angiography shows no atherosclerosis.
Question 2
Which of the following is the next best step for
this patient?
A. Balloon mitral valvuloplasty
B. Mitral valve replacement
C. Exercise study
D. Repeat echocardiogram
Question 2
Which of the following is the next best step for
this patient?
A. Balloon mitral valvuloplasty
B. Mitral valve replacement
C. Exercise study
D. Repeat echocardiogram
Answer 3
•
The correct answer is C. The patient presents with echocardiographic findings of
moderate mitral stenosis. However, the invasive hemodynamic data suggest severe
mitral stenosis. In this discrepancy, the invasive data are incorrect due to the use
of pulmonary capillary wedge pressure for calculation of the mitral gradient.
Pulmonary capillary wedge pressures accurately reflect mean left atrial (LA)
pressure in the vast majority of patients. However, pulmonary capillary wedge
pressures cannot be used for the accurate calculation of the mitral gradient due to
their characteristic temporal delay and damping of the y descent. Doppler
echocardiography is highly reliable for assessment of the transmitral gradient, as
the Doppler probe can be easily aligned with the direction of mitral flow.
In this patient, further evaluation is indicated to assess the mitral gradient with
exercise, as the gradient is highly dependent on transvalvular flow. Balloon mitral
valvuloplasty would be indicated in the presence of elevated transmitral gradient
(>15 mm Hg) during an exercise study. Balloon mitral valvuloplasty would be
preferred over surgical valve replacement due to the pliable nature of the lesion.
•
References
–
Nishimura RA, Otto CM, Bonow RO, et al. 2014 AHA/ACC Guideline for the Management of Patients With Valvular Heart Disease: A Report of
the American College of Cardiology/American Heart Association Task Force on Practice Guidelines. J Am Coll Cardiol 2014;63:e57-185.
–
Nishimura RA, Rihal CS, Tajik AJ, Holmes DR Jr. Accurate measurement of the transmitral gradient in patients with mitral stenosis: a
simultaneous catheterization and Doppler echocardiographic study. J Am Coll Cardiol 1994;24:152-8.
Question 4
A 37-year-old woman presents for routine follow-up in your medical office. When she
was 29 years old, the patient suffered from rheumatic fever with carditis, and
recovered fully with medical therapy. She exercises regularly, usually as a runner who
covers 4 miles in 35 minutes several times per week. The patient is asymptomatic.
There is no history of atrial arrhythmias or prior embolic events.
On physical examination, she is 67 inches tall and weighs 127 lbs. Her blood pressure
is 122/72 mm Hg and heart rate is 76 bpm. Lungs are clear. Examination of the internal
jugular vein, carotid artery, and precordium is entirely normal. The first heart sound is
slightly increased. Both components of the second heart sound are normal. A soft late
diastolic rumble is present that is preceded by a crisp opening snap. There is no third
or fourth heart sound. No peripheral edema is present.
An echocardiogram shows rheumatic mitral stenosis. The mean transmitral gradient is
4 mm Hg, which is observed at a heart rate of 88 bpm. By pressure half-time method,
the mitral valve area is calculated to be 2.3 cm2. Trivial MR is present. The mitral valve
appears pliable (echocardiographic score = 2). With supine bicycle exercise and an
increase in her heart rate to 122 bpm, the mean mitral gradient is 8 mm Hg.
Question 4
Which of the following is the most appropriate
next step for this patient?
A. Percutaneous balloon mitral valvotomy
B. Transesophageal echocardiography (TEE)
C. Penicillin V, 250 mg twice daily
D. Surgical mitral valve replacement
Question 4
Which of the following is the most appropriate
next step for this patient?
A. Percutaneous balloon mitral valvotomy
B. Transesophageal echocardiography (TEE)
C. Penicillin V, 250 mg twice daily
D. Surgical mitral valve replacement
Answer 4
• The correct answer is C. The patient has evidence of rheumatic
mitral stenosis on physical examination and echocardiography.
However, her lesion is mild and she is asymptomatic. Thus, there is
no indication for percutaneous or surgical therapy. TEE would be
indicated to rule out LA thrombus in patients being considered for
percutaneous balloon mitral valvotomy. Current guidelines
recommend antibiotics for secondary prevention in patients with
rheumatic fever and carditis. For those with residual valvular
disease, the recommended duration is 10 years or greater since the
last episode and at least until age 40 years.
•
References
– Nishimura RA, Otto CM, Bonow RO, et al. 2014 AHA/ACC Guideline for the Management of Patients With Valvular Heart Disease:
A Report of the American College of Cardiology/American Heart Association Task Force on Practice Guidelines. J Am Coll Cardiol
2014;63:e57-185.
– Dajani A, Taubert K, Ferrieri P, Peter G, Shulman S. Treatment of acute streptococcal pharyngitis and prevention of rheumatic
fever: a statement for health professionals. Committee on Rheumatic Fever, Endocarditis, and Kawasaki Disease of the Council
on Cardiovascular Disease in the Young, the American Heart Association. Pediatrics 1995;96:758-64.
Question 5
• A 40-year-old woman presents for routine general medical evaluation.
Three years ago, she underwent percutaneous closure of an ostium
secundum atrial septal defect. At that time, the RV was moderately dilated
and dysfunctional, but she was asymptomatic. She has done well since the
procedure, and reports no symptoms.
Her physical examination is unremarkable. TTE demonstrates normal LV
function (EF 65%). The RV is mildly enlarged with mild depression of
systolic function. The atrial septal occluder is well visualized at the atrial
septum with no evidence of device erosion. Doppler color flow across the
atrial septum shows no residual shunting. With intravenous injection of
agitated saline, few bubbles appear in the LA after 7 heartbeats.
The patient will be undergoing a dental procedure to address a cavity that
is associated with gingivitis. She would like to know about the need for
antibiotic prophylaxis. Her medical history is significant for prior
anaphylactoid reaction to penicillin.
Question 5
What is the next best step for her:
A. Amoxicillin 2 g, 30-60 minutes prior to the
procedure
B. Clindamycin 600 mg, 30-60 minutes prior to
the procedure
C. No antibiotic prophylaxis is indicated
D. TEE
E. Cardiac catheterization with oximetry
Question 5
What is the next best step for her:
A. Amoxicillin 2 g, 30-60 minutes prior to the
procedure
B. Clindamycin 600 mg, 30-60 minutes prior to
the procedure
C. No antibiotic prophylaxis is indicated
D. TEE
E. Cardiac catheterization with oximetry
Answer 5
• The correct answer is C. Antibiotic prophylaxis is indicated only for
patients with:
1) prosthetic cardiac valves or prosthetic material used for valve repair
2) prior infective endocarditis
3) unrepaired cyanotic congenital heart disease
4) surgically or percutaneously repaired congenital heart defects during the first 6 months
after the procedure
5) repaired congenital heart disease with residual defects at the site or adjacent to the site
of a prosthesis or
6) cardiac transplant recipients with valvular disease due to a structurally abnormal valve.
Note: Bicuspid AV, VSD, and native valve regurgitation do not warrant IE prophylaxis
– In the present patient, no antibiotic prophylaxis is indicated as the procedure
occurred more than 6 months ago, and there is no evidence of residual
defects. Both TEE and cardiac catheterization can be used to further assess
intracardiac shunting. However, neither of these diagnostic tests would be
indicated when the device and its potential complications can be
comprehensively evaluated with TTE.
•
References
–
Nishimura RA, Otto CM, Bonow RO, et al. 2014 AHA/ACC Guideline for the Management of Patients With Valvular Heart Disease: A Report of
the American College of Cardiology/American Heart Association Task Force on Practice Guidelines. J Am Coll Cardiol 2014;63:e57-185.
Answer 5
• Endocarditis: procedures that warrant IE
prophylaxis
– Dental procedures that involve gingival manipulation
– Respiratory tract procedures that involve invasive
biopsy
– Invasive procedures that involve infected skin or
musculoskeletal tissue
•
Note: GI / GU procedures do not warrant IE prophylaxis, nor routine respiratory
tract procedures that do not involve invasive biopsy
•
Reference:
–
Nishimura, Rick A., et al. "ACC/AHA 2008 Guideline update on valvular heart disease: focused update on infective endocarditis: a report of the American College of
Cardiology/American Heart Association Task Force on Practice Guidelines endorsed by the Society of Cardiovascular Anesthesiologists, Society for Cardiovascular Angiography
and Interventions, and Society of Thoracic Surgeons." Journal of the American College of Cardiology 52.8 (2008): 676-685.
Question 6
•
The decision to intervene as well as the appropriate choice of intervention in
valvular heart disease should be based on the risk-benefit analysis that includes
the operative mortality, the patient’s degree of frailty, the number of current
major organ systems that are dysfunctional, and any specific procedural
impediments that would limit the likelihood that the procedure would be a
success.
In your evaluation of an 80-year-old patient with severe AS, you determine that his
Society of Thoracic Surgeons (STS) predicted risk of mortality (PROM) is 7.0%. He is
relatively active, lives alone, and continues to play golf on the weekends. He has
moderate chronic kidney disease with a creatinine of 1.9. Though a prior smoker,
his most recent pulmonary function tests have not suggested significant lung
disease. He has had a prior bypass procedure and abdominal aortic aneurysm
repair. He otherwise has felt well until recently when he has noted some dyspnea
on exertion. His aortic valve mean gradient is now estimated at 45 mm Hg and the
AVA is 0.7 cm2.
Question 6
Based on the latest guidelines, his combined risk
assessment would place him into which of the
following categories?
A. Low risk
B. Intermediate risk
C. High risk
D. Prohibitive risk
Question 6
Based on the latest guidelines, his combined risk
assessment would place him into which of the
following categories?
A. Low risk
B. Intermediate risk
C. High risk
D. Prohibitive risk
Answer 6
The correct answer is B. The latest valvular heart disease guidelines suggest that the risk-benefit for
patients needing a valvular intervention can be best defined using the following guidelines:
• Low risk: STS PROM <4.0% AND no evidence for frailty AND no other major organ system
dysfunction AND no procedural specific impediment.
• Intermediate risk: STS PROM 4-8% OR at least one index of frailty (mild) OR one organ system
involvement OR a possible procedural impediment.
• High risk: STS PROM >8.0% OR two or more indices of frailty (moderate-severe) OR up to two major
organ systems compromised OR probable procedural impediment.
• Prohibitive risk: Predicted surgical risk or major morbidity at 1 year of >50% OR three or more
major organ systems compromised OR severe procedural impediment.
In the patient described, his surgical risk from the STS score places him in the intermediate risk. He also
has some mild-moderate compromise in his renal function, but he has no obvious frailty despite his age
and there is no clear procedural impediment, although a computed tomography (CT) might be useful to
decide if his prior coronary grafts are adherent to his sternum. He would therefore be considered at
intermediate risk based on the information provided.
Answer 6
• Answer A is incorrect, as the STS score is too high and he has an organ
system involved. Answer C is incorrect, as his STS score is not >8% and he
has no frailty nor two major organ systems involved. Answer D is incorrect
for the same reasons, as he meets none of the most severely restrictive
criteria.
The most difficult decision in this situation is often defining frailty. Most of
the available efforts to quantitate take into account the patient’s
independence in doing routine activities, such as eating, bathing, dressing,
transferring, toileting, incontinence, ambulating (with and without
assistance), and the distance one can ambulate. Procedural impediments
can also be quite subjective, but include the presence of a porcelain aorta,
lack of vascular access, prior chest radiation, adherent coronary grafts to
the sternum, chest malformation, presence of a tracheostomy, etc.
•
References
–
Nishimura RA, Otto CM, Bonow RO, et al. 2014 AHA/ACC Guideline for the Management of Patients With Valvular Heart Disease: A Report of
the American College of Cardiology/American Heart Association Task Force on Practice Guidelines. J Am Coll Cardiol 2014;63:e57-185.
Answer 6
• http://riskcalc.sts.org
Answer 6
Answer 6
Answer 6
Question 7
A 72-year-old woman presents to your clinic with a 1-month history of
progressive shortness of breath and ankle edema. She is New York Heart
Association (NYHA) functional class III. Past medical history includes
hypertension and hyperlipidemia.
On examination, there is an elevated jugular venous pressure to the jaw.
There was a single second heart sound and a grade 2/6 late-peaking systolic
ejection murmur along the second right interspace.
A two-dimensional echocardiogram reveals a mildly dilated LV with a
calculated EF of 36%. There is global hypokinesis and moderate LV
hypertrophy.
A continuous wave Doppler echocardiogram across the aortic valve is shown
(Figure 1).
Question 7
• Her mean gradient was 44 mm Hg. Calculated AVA was 0.67 cm2
• Cardiac catheterization revealed no significant coronary artery disease
Question 7
Which of the following would you now
recommend?
A. Dobutamine echocardiogram to further
assess the severity of the AS
B. Refer for transcatheter aortic valve
replacement (TAVR)
C. Refer for surgical AVR
D. Medical management of congestive heart
failure
Question 7
Which of the following would you now
recommend?
A. Dobutamine echocardiogram to further
assess the severity of the AS
B. Refer for transcatheter aortic valve
replacement (TAVR)
C. Refer for surgical AVR
D. Medical management of congestive heart
failure
Answer 7
• The correct answer is C. One of the Class I guideline indications for AVR is
symptomatic AS. This patient has moderate LV dysfunction and a high
mean gradient, thus classifying it as severe AS with LV dysfunction.
• Dobutamine echocardiography is reserved for low-gradient, low EF AS
(Class IIa). It is defined as a mean gradient of ≤30 mm Hg and an EF <40%.
– Dobutamine is infused to a maximal dose of 20 mcg/kg/min (as tolerated) to
assess for contractile reserve (>20% increase in stroke volume) and to
distinguish between true AS and “pseudo-AS” (i.e., severe LV dysfunction and
not severe AS).
• This patient has no significant comorbidities and therefore would not be
considered a candidate for percutaneous AVR based on current guidelines.
• There is no role for medical management of severe symptomatic AS except
to relieve symptoms prior to valve replacement.
•
References
–
Nishimura RA, Otto CM, Bonow RO, et al. 2014 AHA/ACC Guideline for the Management of Patients With Valvular Heart Disease: A Report of
the American College of Cardiology/American Heart Association Task Force on Practice Guidelines. J Am Coll Cardiol 2014;63:e57-185.
–
Lange RA, Hillis D. Dobutamine stress echocardiography in patients with low gradient aortic stenosis. Circulation 2006;113:1718-20.
Question 8
You are asked to see a 60-year-old man who claims he has had a
murmur since his teenage years. He entered military service, however,
and has not seen a cardiologist since then. He finally had a routine
physical examination with his internist, who ordered an
echocardiogram and Doppler, with the following pertinent results:
• LVEF: 55%
• LV wall thickness: 1.1 cm
• Estimated pulmonary artery pressure via tricuspid regurgitant (TR)
jet velocity: 40 mm Hg
• Aortic valve thickening/calcified
• Aortic Doppler: Peak instantaneous gradient: 3.6 m/sec, mean
gradient 30 mm Hg, estimated AVA: 1.1 cm2
• Aortic root size: 2.8 cm
• LA size: 3.8 cm
Question 8
• The patient claims he has noticed an increase in exertional dyspnea
lately and is unable to climb a flight of stairs without getting
“winded.” He has not had syncope or presyncope, but does have
some chest tightness at times with extreme exertion. He denies any
orthopnea, paroxysmal nocturnal dyspnea, edema, or palpitations.
On examination, his blood pressure is 120/80 mm Hg andheart rate
is 78 bpm. His lungs are clear. He has no jugular venous distention
or hepatojugular reflux. His carotid suggests low amplitude with
delay and there is a transmitted aortic murmur. He has a modest LV
heave in the left lateral position with a palpable A wave. On
auscultation, there is a systolic murmur that is crescendodecrescendo in nature with mid peaking and a single S2. No ejection
click is heard. There is an S4. No aortic regurgitation (AR) or MR is
audible. There is no edema.
Question 8
Given his echo/Doppler and examination
findings, which of the following is the next best
step or this patient?
A. Cardiac magnetic resonance imaging (MRI)
B. Cardiac CT
C. Single-photon emission computed
tomography (SPECT) myocardial perfusion.
D. Cardiac catheterization
Question 8
Given his echo/Doppler and examination
findings, which of the following is the next best
step or this patient?
A. Cardiac magnetic resonance imaging (MRI)
B. Cardiac CT
C. Single-photon emission computed
tomography (SPECT) myocardial perfusion.
D. Cardiac catheterization
Answer 8
•
•
•
•
•
•
The correct answer is D. The correct answer is to proceed with cardiac
catheterization given his symptomatic status and the discrepancy between the
clinical findings and the echo/Doppler.
Given his age, the patient likely has a bicuspid aortic valve and alternative imaging,
such as cardiac MRI and CT, are clearly of value in deciphering whether he has an
associated aortic aneurysm, but the echo does not suggest an enlarged aorta.
Cardiac MRI might be able to clarify the aortic valve severity and provide
quantitative LV functional data, but is an unnecessary step if you believe the
patient has symptomatic AS based on your clinical exam (i.e., loss of ejection
sound, mid-late peaking aortic murmur, loss of A2 resulting in a single second heart
sound). Cardiac MRI can also provide evidence of prior myocardial injury and
myocardial perfusion.
He does have some chest pressure, but a myocardial perfusion study is not helpful
in deciphering the severity of his AS.
It is considered a Class I indication (Level of Evidence C) to proceed to an invasive
study in symptomatic patients where there appears to be a discrepancy between
the echocardiographic findings and the clinical exam and history.
References
–
Nishimura RA, Otto CM, Bonow RO, et al. 2014 AHA/ACC Guideline for the Management of Patients With Valvular Heart Disease: A Report of the American College of
Cardiology/American Heart Association Task Force on Practice Guidelines. J Am Coll Cardiol 2014;63:e57-185.
Question 9
A 70-year-old man is referred from his internist for management of AS. He
retired this past year from the local university. He and his wife walk daily for
30 minutes every morning. He denies any exertional limitations, angina, or
syncope. An echocardiogram demonstrates an aortic velocity of 3.5 m/s, valve
area of 1.0 cm2, EF 60%, and mild LV hypertrophy is present. His exam is
notable for the lack of hypertension or vascular disease. He has a grade 3/6
systolic murmur over the base of the heart radiating to the carotids, clavicles,
and apex.
Which of the following do you recommend to his internist?
A. Repeat echo in 6 months
B. Repeat echo in 1 year
C. Repeat echo in 3 years
D. No need to repeat echo; follow by exam and history
E. Follow-up only as needed since he is asymptomatic
Question 9
A 70-year-old man is referred from his internist for management of AS. He
retired this past year from the local university. He and his wife walk daily for
30 minutes every morning. He denies any exertional limitations, angina, or
syncope. An echocardiogram demonstrates an aortic velocity of 3.5 m/s, valve
area of 1.0 cm2, EF 60%, and mild LV hypertrophy is present. His exam is
notable for the lack of hypertension or vascular disease. He has a grade 3/6
systolic murmur over the base of the heart radiating to the carotids, clavicles,
and apex.
Which of the following do you recommend to his internist?
A. Repeat echo in 6 months
B. Repeat echo in 1 year
C. Repeat echo in 3 years
D. No need to repeat echo; follow by exam and history
E. Follow-up only as needed since he is asymptomatic
Answer 9
In the absence of change in signs or symptoms of AS, surveillance echocardiographic
follow-up is recommended. This recommendation is predicated on the potential for
silent and variable progression of AS, as well as the potential for progressive LV
dysfunction and the development of other concomitant valvular heart disease.
The frequency of follow-up is based on the severity of disease (Aortic velocity):
– ≥ 4.0 m/s, 1 year
– ≥ 3.0-3.9 m/s, 1 -2 years
– ≥ 2.0-2.9 m/s, 3-5 years
This patient has moderate AS; thus, the follow-up should be 1-2 years or answer B.
The average annual rate of progression is an increase in aortic velocity of 0.3 m/sec,
mean gradient of 5-10 mm Hg, and decrease in AVA of 0.1 cm2 once moderate AS is
present.
More rapid progression can be anticipated in the presence of advanced age and
extensive valvular calcification, but progression is highly variable. Repeat
echocardiographic assessment is indicated if symptoms or a change in exam develops.
References
•
Nishimura RA, Otto CM, Bonow RO, et al. 2014 AHA/ACC Guideline for the Management of Patients With Valvular Heart Disease: A Report of the American College of
Cardiology/American Heart Association Task Force on Practice Guidelines. J Am Coll Cardiol 2014;63:e57-185.
Question 10
• You have been following a 71-year-old man for over a
decade with known bicuspid aortic valve stenosis. He is a
college professor and is very physically active. He had a
cardiac MRI that revealed no evidence for an associated
dilated ascending aorta. He has noted gradual worsening of
the severity of his AS and now has a peak instantaneous
Doppler velocity of 4.1 m/sec, an estimated mean aortic
gradient of 42 mm Hg, and an AVA of 0.9 cm2 with normal
LV function. He continues to deny any exertional symptoms
of chest pressure, dyspnea, or dizziness.
You are concerned, however, that he has now developed
severe AS, given his echo/Doppler findings.
Question 10
Which of the following is the appropriate next
step based on the current guidelines?
A. Proceed to surgical AVR
B. Evaluate for percutaneous AVR
C. Exercise stress test
D. Monitor with echocardiograms every 6
months
Question 10
Which of the following is the appropriate next
step based on the current guidelines?
A. Proceed to surgical AVR
B. Evaluate for percutaneous AVR
C. Exercise stress test
D. Monitor with echocardiograms every 6
months
Answer 10
The correct answer is C. The patient now has evidence for significant aortic valve
stenosis. He denies symptoms, however. It is reasonable to proceed directly to surgery
in asymptomatic severe AS if the gradient is “super-severe” (i.e., velocity >5 m/sec and
the patient is low risk (Class IIa indication; Level of Evidence B), but he does not meet
those criteria. Thus, answer A is incorrect. He is not high risk and has a bicuspid aortic
valve, making an evaluation for TAVR incorrect as well. AS progresses very slowly and it
is still safe to monitor his echocardiograms on a yearly basis and continue to assess
whether any symptoms emerge; therefore, answer D is incorrect.
The correct answer is, therefore, option C: perform an exercise treadmill test. This
should always be done under the supervision of a physician, with close monitoring of
both the ECG and blood pressure response. The test should be considered positive if
there are any symptoms provoked, if there is an abnormal hemodynamic response
(hypotension or a lack of rise >20 mm Hg in systemic blood pressure with stress, or ST
abnormalities develop). By using this method, up to 29% of patients thought to be
asymptomatic can be identified as being limited by the aortic valve stenosis. Exercise
stress testing should not be performed in patients with symptoms of AS or in those
with “super-severe” AS.
References
•
Nishimura RA, Otto CM, Bonow RO, et al. 2014 AHA/ACC Guideline for the Management of Patients With Valvular Heart Disease: A Report of the
American College of Cardiology/American Heart Association Task Force on Practice Guidelines. J Am Coll Cardiol 2014;63:e57-185.
Question 11
• A 72-year-old man complains of mild dyspnea while walking up
hills. Symptoms began about 6 months ago. Past medical history is
remarkable for a heart murmur detected 8 years previously,
hypertension, and gout. Current medications include lisinopril 10
mg and diltiazem 180 mg slow-release daily. His blood pressure is
150/80 mm Hg, and heart rate is 70 bpm. There is no jugular
venous distention or hepatojugular reflux. The chest exam is clear.
The carotid upstrokes are slightly weak and delayed. There is a
normal first heart sound, the aortic component of the second
sound is reduced, and there is a grade 3/6 mid-peaking systolic
ejection murmur heard best at the left upper sternal border. There
is mild peripheral edema.
Based on these data, you obtain an echocardiogram (Figure 1).
Question 11
• Associated Doppler information includes a peak instantaneous aortic valve
velocity of 4.5 m/sec, an estimated mean aortic valve gradient of 43 mm
Hg, and a calculated AVA of 0.8 cm2. His LVEF is 55%.
Question 11
Which of the following is the best next step in
management of this patient?
A. Improve his systemic BP control
B. TEE
C. AVR
D. Exercise treadmill stress testing
Question 11
Which of the following is the best next step in
management of this patient?
A. Improve his systemic BP control
B. TEE
C. AVR
D. Exercise treadmill stress testing
Answer 11
The correct answer is C. The patient has severe AS by
pressure gradient by all measures
• peak instantaneous velocity >4 m/sec
• mean gradient >40 mm Hg
• and AVA <1.0 cm2
He is symptomatic as well. These all meet the Class I
guideline criteria for AVR.
Improving blood pressure control is important, but he
does not need stress testing or a TEE to further define his
requirement for AVR
References
•
Nishimura RA, Otto CM, Bonow RO, et al. 2014 AHA/ACC Guideline for the Management of Patients With Valvular Heart Disease: A Report of the
American College of Cardiology/American Heart Association Task Force on Practice Guidelines. J Am Coll Cardiol 2014;63:e57-185.
Question 12
You are asked to see an 87-year-old woman who has known aortic valve stenosis. She lives in an assisted
living environment, but is quite independent and continues to knit and visit with friends and family. She
had a prior cerebrovascular accident (CVA) 2 years ago, but has recovered except for a mild right foot
drop, causing her to ambulate with a cane or walker. Her past history is also positive for hypertension,
mild type 2 diabetes, mild obesity, a right hip replacement, and a prior colon resection for colon cancer
(12 years ago). She has recently noticed that her stamina has declined and now she is dyspneic after
ambulating just 30-40 feet. She has no orthopnea or paroxysmal nocturnal dyspnea, but does note
bilateral ankle edema. She has no palpitations or chest pain, and has not fallen since her stroke.
On her exam, she has obvious severe AS, and this is confirmed by an echocardiogram that reveals
severe AS with preserved LV systolic function. Her peak gradient is 4.8 m/sec and mean gradient is 50
mm Hg, with an AVA of 0.5 cm2. Pertinent laboratory data, however, reveal her creatinine is 3.2 and she
has a severely calcific aorta (porcelain aorta) on the screening CT scan.
Based on the preceding findings, which of the following therapeutic options do you recommend?
A.
Percutaneous balloon aortic valvuloplasty
B.
TAVR
C.
Medical therapy alone
D.
Surgical AVR
Question 12
You are asked to see an 87-year-old woman who has known aortic valve stenosis. She lives in an assisted
living environment, but is quite independent and continues to knit and visit with friends and family. She
had a prior cerebrovascular accident (CVA) 2 years ago, but has recovered except for a mild right foot
drop, causing her to ambulate with a cane or walker. Her past history is also positive for hypertension,
mild type 2 diabetes, mild obesity, a right hip replacement, and a prior colon resection for colon cancer
(12 years ago). She has recently noticed that her stamina has declined and now she is dyspneic after
ambulating just 30-40 feet. She has no orthopnea or paroxysmal nocturnal dyspnea, but does note
bilateral ankle edema. She has no palpitations or chest pain, and has not fallen since her stroke.
On her exam, she has obvious severe AS, and this is confirmed by an echocardiogram that reveals
severe AS with preserved LV systolic function. Her peak gradient is 4.8 m/sec and mean gradient is 50
mm Hg, with an AVA of 0.5 cm2. Pertinent laboratory data, however, reveal her creatinine is 3.2 and she
has a severely calcific aorta (porcelain aorta) on the screening CT scan.
Based on the preceding findings, which of the following therapeutic options do you recommend?
A.
Percutaneous balloon aortic valvuloplasty
B.
TAVR
C.
Medical therapy alone
D.
Surgical AVR
Question 12
The correct answer is B. This is a difficult patient, and it is hard to know the correct
thing to do next. She has multiple organ system dysfunction with significant renal
disease and prior stroke with residual. She also has some frailty with her limited
activity, although she continues to enjoy family and sedentary activity.
Answer A is not correct, as it is a reasonable option only as a bridge to surgical AVR or
TAVR, and the decision for one of those should be made now.
She has criteria to be considered a prohibitive surgical risk given her porcelain aorta,
significant renal disease, and CVA with residual. This has left her rather frail as well.
The surgical option seems off the table for those reasons. She could opt for continued
medical therapy knowing that it will eventually fail given the severity of her AS, or she
would be considered a candidate for TAVR in a setting where there is a team of
physicians dedicated to the procedure. Based on the newest guidelines, TAVR is
recommended if patients have an indication for AVR, but a prohibitive risk for surgical
AVR and a predicted post-TAVR survival of >12 months.
References
•
Nishimura RA, Otto CM, Bonow RO, et al. 2014 AHA/ACC Guideline for the Management of Patients With Valvular Heart Disease: A Report of the
American College of Cardiology/American Heart Association Task Force on Practice Guidelines. J Am Coll Cardiol 2014;63:e57-185.
Question 13
An 84-year-old man presents to the clinic with mild dyspnea on
exertion. Past history includes hypertension (not compliant with
medications), hyperlipidemia, chronic kidney disease, and recurrent
gout.
His examination reveals a heart rate of 75 bpm and a blood pressure of
160/65 mm Hg. He has a grade1/6 early peaking systolic ejection
murmur in the second right interspace and a grade 2/4 diastolic
murmur in the left sternal border.
The echocardiogram shows preserved EF and moderate LV
hypertrophy. There was moderate LA enlargement and grade 2
diastolic dysfunction. The aortic valve was sclerotic and trileaflet. The
regurgitant volume of the aortic insufficiency (AI) was estimated at 35
cc/beat and the width of the jet was 50% of the LV outflow tract
diameter.
Question 13
Based on these data, you would define the
severity of this AR as which of the following?
A. Trivial
B. Mild
C. Moderate
D. Severe
Question 13
Based on these data, you would define the
severity of this AR as which of the following?
A. Trivial
B. Mild
C. Moderate
D. Severe
Answer 13
The correct answer is C. The AR is moderate.
Severe AR is characterized by a regurgitant volume ≥60 cc, a
jet width ≥65% of LV outflow tract diameter, vena contracta
>0.6 cm, ERO ≥30 mm2 and/or regurgitant fraction ≥50%
Moderate AR: regurgitant volume = 30-59 cc, jet width 2564% of LV outflow tract, vena contracta 0.3-0.6 cm, ERO 10-29
mm2, and/or regurgitant fraction 30-49%
Mild AR: regurgitant volume <30 cc, jet width <25% of LV
outflow tract, vena contracta <0.3 cm, ERO ≤10 mm2, and/or
regurgitant fraction <30%. These guidelines place him in the
moderate range for the severity of the AR
References
•
Zogbhi WA, Enriquez-Sarano M, Foster E, et al. Recommendations for evaluation of the severity of native valvular regurgitation with two-dimensional
and Doppler echocardiography. J Am Soc Echocardiogr 2003;16:777-802.
Answer 13
Question 14
You have been following a 48-year-old man who has a known bicuspid aortic valve with evidence for an
ascending aneurysm or coarctation of the aorta by a prior CT obtained 10 years ago. He has been doing
well and works full-time as a garage mechanic, doing reasonable heavy physical labor at times. He has
noted only mild dyspnea with exertion, but he attributes this to his increasing weight gain. He is now 68
inches and weighs 295 lbs.
His exam is remarkable for a blood pressure of 140/65 mm Hg, heart rate of 80 bpm, clear lungs, and no
obvious jugular venous distention. He has a barrel chest, but no LV heave noted. On auscultation, he has
a grade 2/6 AS murmur with probable aortic ejection click and a grade 3/4 diastolic blowing murmur
along the left sternal border. His peripheral pulses are hyperdynamic and the systolic blood pressure in
his leg is noted to be 185 mm Hg. He has no edema. You order an echocardiogram, but due this body
habitus, the pictures are quite poor.
Given this scenario, which of the following diagnostic studies should be considered next to better assess
his cardiac function and the severity of his AR?
A.
Repeat transthoracic echocardiogram with contrast
B.
CT of the aortic root only
C.
Cardiac MRI
D.
Cardiac catheterization
Question 14
You have been following a 48-year-old man who has a known bicuspid aortic valve with evidence for an
ascending aneurysm or coarctation of the aorta by a prior CT obtained 10 years ago. He has been doing
well and works full-time as a garage mechanic, doing reasonable heavy physical labor at times. He has
noted only mild dyspnea with exertion, but he attributes this to his increasing weight gain. He is now 68
inches and weighs 295 lbs.
His exam is remarkable for a blood pressure of 140/65 mm Hg, heart rate of 80 bpm, clear lungs, and no
obvious jugular venous distention. He has a barrel chest, but no LV heave noted. On auscultation, he has
a grade 2/6 AS murmur with probable aortic ejection click and a grade 3/4 diastolic blowing murmur
along the left sternal border. His peripheral pulses are hyperdynamic and the systolic blood pressure in
his leg is noted to be 185 mm Hg. He has no edema. You order an echocardiogram, but due this body
habitus, the pictures are quite poor.
Given this scenario, which of the following diagnostic studies should be considered next to better assess
his cardiac function and the severity of his AR?
A.
Repeat transthoracic echocardiogram with contrast
B.
CT of the aortic root only
C.
Cardiac MRI
D.
Cardiac catheterization
Answer 14
The correct answer is C. The patient has a bicuspid aortic valve with evidence for
significant AR. His body habitus precludes adequate chest wall echo/Doppler imaging,
and it is appropriate to seek an alternative imaging modality. Echocardiographic
contrast may help in outlining the clinical structures, but still proves to be inadequate
data for this root anatomy. CT of the root only will provide the necessary data for this
root anatomy, but not regarding the severity of this AR and LV function. Cardiac
catheterization would be indicated to assess his hemodynamics, root anatomy, and
coronary anatomy prior to surgical intervention, but is not indicated as the next step.
The best choice is cardiac MRI. It not only provides excellent images of ventricular
function and his aortic valve and root, but it also provides a quantitative measurement
of the degree of regurgitation that is present, something neither a cardiac CT nor TEE
can accomplish readily. Ordering a cardiac MRI in this situation is now considered a
Class I indication (Level of Evidence B).
References
•
Nishimura RA, Otto CM, Bonow RO, et al. 2014 AHA/ACC Guideline for the Management of Patients With Valvular Heart Disease: A Report of the
American College of Cardiology/American Heart Association Task Force on Practice Guidelines. J Am Coll Cardiol 2014;63:e57-185.
Question 15
A 43-year-old man with a known bicuspid aortic valve is admitted after 3
months of low grade fevers, weakness and fatigue. He appears toxic and with
sinus tachycardia at 110, a temperature of 33.8 C and a BP of 90/60. He has
bilateral rales halfway up his back on lung auscultation. His JVP is not
elevated, though he has a positive hepatojugular reflux. He is hyperdynamic
with a soft aortic stenotic murmur and a soft aortic diastolic murmur. A loud
S3 is appreciated and S1 is barely audible. There is no edema.
Initial lab reveals an anemia with hematocrit of 28%, normal electrolytes and
a serum creatinine of 1.4. His sed rate is 98 and the initial blood cultures both
grow are growing a gram positive organism in chains. You obtain a
transthoracic echocardiogram and there is evidence for a vegetation on the
aortic valve with what appears to be moderate AR. No abscess is seen on the
transthoracic echo. An M-mode echo is also obtained with the study and is
shown (Figure 1).
Question 15
Question 15
Based on the preceding information, which of
the following is the next course of action?
A. Urgent surgical intervention
B. Begin antibiotics and await surveillance
cultures before intervening
C. Obtain an urgent TEE to further assess the
valvular status
D. Proceed to cardiac catheterization in
anticipation of surgery
Question 15
The correct answer is A. The patient has early closure of the mitral valve and
is in heart failure with eminent shock. He has severe acute AR that results in
rapid elevation of the LV diastolic closure, thus closing the mitral valve prior
to the QRS and ventricular systole. This sign implies marked hemodynamic
compromise, and he needs urgent surgery.
While antibiotics should be started, there is no reason to wait in this
situation.
A TEE would help define the aortic anatomy, but would only delay his surgery.
A TEE would be routinely obtained at surgery anyway.
He does not require a catheterization at his age, and there is no reason to
further delay his surgery based on the echocardiographic findings.
References
•
Nishimura RA, Otto CM, Bonow RO, et al. 2014 AHA/ACC Guideline for the Management of Patients With Valvular Heart Disease: A Report of the American College of
Cardiology/American Heart Association Task Force on Practice Guidelines. J Am Coll Cardiol 2014;63:e57-185.
Quesiton 16
A bicuspid aortic valve is often associated with an ascending aortic aneurysm due to
concomitant aortic aortopathy. The aortic dilatation can be either in the sinuses or
more commonly in the ascending aorta, and appears to be more common in patients
with commissural fusion of the noncoronary cusp with either the right or left cusp (vs.
right-to-left commissural fusion). In the majority of patients, imaging of the aorta
should be considered with use of either CT or cardiac MR to define the presence or
absence and/or the size of the aorta in these patients. The newest guidelines have
updated the size of the aorta that is considered a Class I indication for aortic root
repair regardless of the severity of the associated bicuspid aortic valve.
At which of the following aortic root diameters is it now recommended (Class I
indication) that one intervene on the aortic root in a patient with a bicuspid aortic
valve, even when there are no indications for AVR or any other risk factors for
dissection?
A. 4.0 cm
B. 4.5 cm
C. 5.0 cm
D. 5.5 cm
E.
6.0 cm
Quesiton 16
A bicuspid aortic valve is often associated with an ascending aortic aneurysm due to
concomitant aortic aortopathy. The aortic dilatation can be either in the sinuses or
more commonly in the ascending aorta, and appears to be more common in patients
with commissural fusion of the noncoronary cusp with either the right or left cusp (vs.
right-to-left commissural fusion). In the majority of patients, imaging of the aorta
should be considered with use of either CT or cardiac MR to define the presence or
absence and/or the size of the aorta in these patients. The newest guidelines have
updated the size of the aorta that is considered a Class I indication for aortic root
repair regardless of the severity of the associated bicuspid aortic valve.
At which of the following aortic root diameters is it now recommended (Class I
indication) that one intervene on the aortic root in a patient with a bicuspid aortic
valve, even when there are no indications for AVR or any other risk factors for
dissection?
A. 4.0 cm
B. 4.5 cm
C. 5.0 cm
D. 5.5 cm
E.
6.0 cm
Answer 16
The correct answer is D. The current Class I (Level of Evidence C) indication
for repair or replacement of the aortic root in patients with a bicuspid aortic
valve has returned to 5.5 cm. This is a change from the 2008 American
College of Cardiology Foundation (ACCF)/American Heart Association (AHA)
guidelines back to what had been the critical dimension on prior guidelines.
Surgery may continue to be considered if the aorta is 5.0 cm and there are
associated risk factors, such as:
• a family history of dissection
• or there is a change in the aortic root size of >0.5 cm in 1 year (Class IIa
Level of Evidence C)
In point of fact, the critical dimension for complications in patients with an
ascending aneurysm and a bicuspid aortic valve is 6.0 cm (Figure 1), so every
effort should be made to not allow the root to expand to this level.
References
•
Nishimura RA, Otto CM, Bonow RO, et al. 2014 AHA/ACC Guideline for the Management of Patients With Valvular Heart Disease: A Report of the American College of
Cardiology/American Heart Association Task Force on Practice Guidelines. J Am Coll Cardiol 2014;63:e57-185.
Answer 16
Question 17
A 34-year-old woman is referred to you with shortness of breath and the new onset of
atrial fibrillation. After your examination and following the performance of the chest
wall echo/Doppler, you find she has significant mitral stenosis (mean gradient 15 mm
Hg) with mild MR. Her estimated pulmonary pressures are elevated at 64 mm Hg and
her LA size is 5.0 cm. Her valvular leaflets appear fused on the echocardiogram, but
there is still good mobility with mild-moderate valvular thickening, only minimal
calcium, and mild-moderate submitral scar and retraction. You conclude that her echo
score for all this is approximately 8. However, you are concerned regarding the
severity of her MR. By the transthoracic echo, there appears to be only mild MR, but it
is clearly audible on exam.
The next appropriate test to decide if she is a candidate for percutaneous balloon
mitral valvuloplasty would be which of the following:
A. Cardiac MRI
B. Cardiac CT
C. TEE
D. Cardiac catheterization
Question 17
A 34-year-old woman is referred to you with shortness of breath and the new onset of
atrial fibrillation. After your examination and following the performance of the chest
wall echo/Doppler, you find she has significant mitral stenosis (mean gradient 15 mm
Hg) with mild MR. Her estimated pulmonary pressures are elevated at 64 mm Hg and
her LA size is 5.0 cm. Her valvular leaflets appear fused on the echocardiogram, but
there is still good mobility with mild-moderate valvular thickening, only minimal
calcium, and mild-moderate submitral scar and retraction. You conclude that her echo
score for all this is approximately 8. However, you are concerned regarding the
severity of her MR. By the transthoracic echo, there appears to be only mild MR, but it
is clearly audible on exam.
The next appropriate test to decide if she is a candidate for percutaneous balloon
mitral valvuloplasty would be which of the following:
A. Cardiac MRI
B. Cardiac CT
C. TEE
D. Cardiac catheterization
Answer 17
The correct answer is C. Patients with rheumatic valvular mitral stenosis have been shown to do well
following percutaneous balloon mitral valvuloplasty. Long-term results mirror those of surgical
commissurotomy. This patient has indications for intervention in her mitral stenosis, as her mean
gradient is >5 mm Hg at a heart rate <70 bpm, there is pulmonary hypertension and atrial fibrillation,
and she is symptomatic.
The mitral valve appears amenable to a percutaneous approach with relatively low echo score.
• Each component of the echo score is graded 1-4 with 4 being the most severe.
• The components include: valvular mobility, valvular thickening, the amount of calcification, and the
amount of submitral apparatus scar and retraction.
• Not included in the scoring system, however, is the degree of MR. The procedure is ineffective if the
MR is >2+.
The next best test to decide that is the TEE. This is especially the case, since an atrial thrombus needs to
be excluded as well before the procedure can be done.
Cardiac MRI can estimate the degree of MR by noting the regurgitant flow and, if properly obtained, can
provide some evidence for an atrial appendage thrombus; thus, it would be a second choice in this
situation.
The cardiac CT would not provide the MR severity information, and cardiac catheterization should be
reserved for either resolving unclear information from the noninvasive studies or for the actual
procedure.
References
•
Nishimura RA, Otto CM, Bonow RO, et al. 2014 AHA/ACC Guideline for the Management of Patients With Valvular Heart Disease: A Report of the American College of
Cardiology/American Heart Association Task Force on Practice Guidelines. J Am Coll Cardiol 2014;63:e57-185.
Answer 17
Answer 17
Answer 17
Answer 17
Question 18
You have been sent a 30-year-old patient with symptomatic severe rheumatic mitral
stenosis, who appears to have a relatively low echo score for success using balloon
mitral valvuloplasty. Prior to the procedure, you obtain a TEE that reveals an LA
appendage thrombus. She has never had a clinical embolic event and is in normal
sinus rhythm at the time of the TEE. Her current medications include aspirin 81 mg a
day, furosemide 40 mg a day, spironolactone 12.5 mg/day, and metoprolol 25 mg
twice a day. She is also taking a birth control pill.
Based on the preceding information, you recommend repeating the TEE in 4-6 weeks
before attempting the mitral valvuloplasty.
During that time, which of the following do you also recommend?
A. Discontinue the birth control pill
B. Begin warfarin to achieve an international normalized ratio (INR) of 2.0-2.5
C. Increase the aspirin dose to 325 mg a day
D. Begin dabigatran at 150 mg twice a day
Question 18
You have been sent a 30-year-old patient with symptomatic severe rheumatic mitral
stenosis, who appears to have a relatively low echo score for success using balloon
mitral valvuloplasty. Prior to the procedure, you obtain a TEE that reveals an LA
appendage thrombus. She has never had a clinical embolic event and is in normal
sinus rhythm at the time of the TEE. Her current medications include aspirin 81 mg a
day, furosemide 40 mg a day, spironolactone 12.5 mg/day, and metoprolol 25 mg
twice a day. She is also taking a birth control pill.
Based on the preceding information, you recommend repeating the TEE in 4-6 weeks
before attempting the mitral valvuloplasty.
During that time, which of the following do you also recommend?
A. Discontinue the birth control pill
B. Begin warfarin to achieve an international normalized ratio (INR) of 2.0-2.5
C. Increase the aspirin dose to 325 mg a day
D. Begin dabigatran at 150 mg twice a day
Answer 18
The correct answer is B. While being on the birth control pill may contribute
to a hypercoagulable state, there are no data that its discontinuation would
result in dissolution of the appendage thrombus. Similarly, there are currently
no data that in a patient with valvular disease and paroxysmal atrial
fibrillation that either increasing the aspirin dose or the use of other
antithrombin agents is superior to the use of warfarin. The use of warfarin in
this setting is a Class I indication (Level of Evidence B). A vitamin K antagonist
is also indicated in mitral stenosis patients with paroxysmal, persistent, or
permanent atrial fibrillation, or in those who have had a prior embolic event.
The most recent guidelines also suggest, as a Class IIb indication (Level of
Evidence C), that vitamin K antagonists be considered when the mitral valve
area is <1.5 cm2 and there is echo evidence that the LA is >55 mm by TTE, or if
there is spontaneous LA appendage contrast.
References
•
Nishimura RA, Otto CM, Bonow RO, et al. 2014 AHA/ACC Guideline for the Management of Patients With Valvular Heart Disease: A Report of the
American College of Cardiology/American Heart Association Task Force on Practice Guidelines. J Am Coll Cardiol 2014;63:e57-185.
Question 19
A 50-year-old physician with a 5-year history of mitral valve prolapse presents
with an acute increase in his murmur. His wife reports noting a new audible
murmur when she sat next to him recently while watching television. He feels
well and notes no change in stamina, chest pain, or dyspnea. His exam
confirms a grade 4/6 holosystolic murmur over precordium and loudest at the
apex. His echocardiogram demonstrates flail posterior leaflet from chordal
rupture and ERO 35 cm2, EF 60%, end-systolic dimension 4.5 cm, and LA 4.5
cm. His ECG shows sinus rhythm, occasional premature ventricular
contractions, and a narrow QRS with nonspecific ECG changes.
Which of the following do you recommend?
A. Continued observation since asymptomatic
B. Surgical referral
C. Antibiotic prophylaxis
D. Lisinopril
E. Carvedilol
Question 19
A 50-year-old physician with a 5-year history of mitral valve prolapse presents
with an acute increase in his murmur. His wife reports noting a new audible
murmur when she sat next to him recently while watching television. He feels
well and notes no change in stamina, chest pain, or dyspnea. His exam
confirms a grade 4/6 holosystolic murmur over precordium and loudest at the
apex. His echocardiogram demonstrates flail posterior leaflet from chordal
rupture and ERO 35 cm2, EF 60%, end-systolic dimension 4.5 cm, and LA 4.5
cm. His ECG shows sinus rhythm, occasional premature ventricular
contractions, and a narrow QRS with nonspecific ECG changes.
Which of the following do you recommend?
A. Continued observation since asymptomatic
B. Surgical referral
C. Antibiotic prophylaxis
D. Lisinopril
E. Carvedilol
Answer 19
The correct answer is B. Although this physician is
asymptomatic, he has developed acute severe MR
complicated by a flail mitral leaflet and an increased endsystolic dimension suggesting early LV dysfunction. Surgical
management is recommended due to the natural history of
severe MR in the setting of a flail leaflet and early LV
dysfunction.
Antibiotic prophylaxis is no longer recommended for such
lesions.
There is currently insufficient evidence that either
angiotensin-converting enzyme inhibitors or beta-blockers
meaningfully alter the natural history of severe MR.
References
•
Nishimura RA, Otto CM, Bonow RO, et al. 2014 AHA/ACC Guideline for the Management of Patients With Valvular Heart Disease: A Report of the American College of
Cardiology/American Heart Association Task Force on Practice Guidelines. J Am Coll Cardiol 2014;63:e57-185.
•
Ling LH, Enriquez-Sarano M, Seward JB, et al. Clinical outcome of mitral regurgitation due to flail leaflet. N Engl J Med 1996;335:1417-23.
Question 20
A 63-year-old man, NYHA class I, presents to your clinic with a newly
diagnosed heart murmur.
His echocardiogram shows the following: LV end-systolic diameter is 50
mm. LVEF is 55%. There is posterior leaflet prolapse of the mitral valve
with color flow evidence for significant MR. The ERO is measured at 45
mm2. Blood pressure during the exam is 140/80 mm Hg.
Based on the echocardiographic findings, which of the following would
you recommend?
A. Watchful waiting
B. Treat hypertension; re-echo in 6 months
C. Refer for mitral valve repair
D. Refer for mitral valve replacement
Question 20
A 63-year-old man, NYHA class I, presents to your clinic with a newly
diagnosed heart murmur.
His echocardiogram shows the following: LV end-systolic diameter is 50
mm. LVEF is 55%. There is posterior leaflet prolapse of the mitral valve
with color flow evidence for significant MR. The ERO is measured at 45
mm2. Blood pressure during the exam is 140/80 mm Hg.
Based on the echocardiographic findings, which of the following would
you recommend?
A. Watchful waiting
B. Treat hypertension; re-echo in 6 months
C. Refer for mitral valve repair
D. Refer for mitral valve replacement
Answer 20
The correct answer is C. The patient has severe MR by
quantitative echocardiography (regurgitant volume ≥60
cc/ERO ≥40 mm2).
Although he is asymptomatic, the ventricle is dilated and the
EF is not normal for severe MR.
A Class I guideline recommendation to refer for surgery in the
asymptomatic patient with severe MR and mitral valve
prolapse is an EF of 30-60% and/or an end-systolic diameter of
≥40 mm.
Isolated posterior leaflet prolapse is ideal for valve repair with
a >90% chance of success.
References
•
Nishimura RA, Otto CM, Bonow RO, et al. 2014 AHA/ACC Guideline for the Management of Patients With Valvular Heart Disease: A Report of the
American College of Cardiology/American Heart Association Task Force on Practice Guidelines. J Am Coll Cardiol 2014;63:e57-185.
Answer 20
Answer 20
Answer 20
Question 21
A 51-year-old woman is referred to you with mitral valve prolapse and severe MR. She
has had known MR for many years and has been followed with serial
echocardiography. Her most recent echo/Doppler reveals severe posterior leaflet
prolapse with a valvular aneurysmal bulge and possible torn mitral chord. The
prolapse involves approximately one-third of the posterior mitral leaflet.
The other features of her echocardiogram are listed as follows:
• LV end-diastolic dimension 5.8 cm
• LV end-systolic dimension 4.1 cm
• LVEF estimate: 50%
• ERO 0.45 cm2
• Mild TR
• Pulmonary systolic pressure estimate: 45 mm Hg
• No mitral gradient
• No aortic valve disease
• Mild LV hypertrophy
Question 21
Based on these data, which of the following would
be the next appropriate step for this patient?
A. Mitral valve replacement
B. Mitral valve repair
C. Exercise testing
D. Afterload reduction with an angiotensinconverting enzyme inhibitor or angiotensinreceptor blocker
Question 21
Based on these data, which of the following would
be the next appropriate step for this patient?
A. Mitral valve replacement
B. Mitral valve repair
C. Exercise testing
D. Afterload reduction with an angiotensinconverting enzyme inhibitor or angiotensinreceptor blocker
Answer 21
The correct answer is B. The patient has reached an indication for an intervention into
her MR. Her LVEF is now below 60% and her LV end-systolic dimension is >4.0 cm. She
has severe MR (ERO 0.4 cm2). There is no need to consider any functional testing with
exercise in this situation. In addition, there are no data that afterload reduction alters
the course of her disease. She should undergo an intervention. She is not a prohibitive
surgical risk; thus, a percutaneous approach is not warranted and she should therefore
have surgical intervention. When the prolapse involves <50% of the posterior leaflet,
the surgical approach should definitely be valve repair and not replacement.
Indeed, for the most part, mitral repair should always be a first choice in those with
degenerative mitral valve disease. Current guidelines emphasize that it is a Class III
(harm) indication to do mitral valve replacement in a patient with <50% of the
posterior leaflet involved; rather, they all should have mitral repair. The only exception
would be in those situations where mitral repair was attempted and failed.
References
•
Nishimura RA, Otto CM, Bonow RO, et al. 2014 AHA/ACC Guideline for the Management of Patients With Valvular Heart Disease: A Report of the
American College of Cardiology/American Heart Association Task Force on Practice Guidelines. J Am Coll Cardiol 2014;63:e57-185.
Question 22
In approximately 80% of the cases of TR, the anatomic underpinnings are functional in
nature. This relates to the fact that chordal attachments for the three leaflets are
often on the ventricular wall and not specific papillary muscles. If the RV dilates for
any reason, it results in poor leaflet coaptation due to the resultant tethering of the
valve. In addition, the tricuspid annular reverts from its normal saddle-shaped
ellipsoid to a planar circular structure when the RV enlarges, further discouraging
appropriate leaflet coaptation. The decision as to when to operate in functional TR is
not an infrequent clinical dilemma.
Which of the following is considered a Class I (Level of Evidence C) indication for
tricuspid valve repair when severe TR is present?
A. When left-sided valve surgery is being performed
B. When the patient is in need of a pacemaker or defibrillator that will cross the
tricuspid valve
C. When there is evidence for pulmonary hypertension due to thromboembolic
disease
D. When the TR has resulted in atrial arrhythmias
Question 22
In approximately 80% of the cases of TR, the anatomic underpinnings are functional in
nature. This relates to the fact that chordal attachments for the three leaflets are
often on the ventricular wall and not specific papillary muscles. If the RV dilates for
any reason, it results in poor leaflet coaptation due to the resultant tethering of the
valve. In addition, the tricuspid annular reverts from its normal saddle-shaped
ellipsoid to a planar circular structure when the RV enlarges, further discouraging
appropriate leaflet coaptation. The decision as to when to operate in functional TR is
not an infrequent clinical dilemma.
Which of the following is considered a Class I (Level of Evidence C) indication for
tricuspid valve repair when severe TR is present?
A. When left-sided valve surgery is being performed
B. When the patient is in need of a pacemaker or defibrillator that will cross the
tricuspid valve
C. When there is evidence for pulmonary hypertension due to thromboembolic
disease
D. When the TR has resulted in atrial arrhythmias
Answer 22
The correct answer is A. It is a Class I indication to perform tricuspid
valve repair when repairing or replacing the mitral or aortic valve and
there is associated severe TR.
While pacemakers and/or defibrillators are a source of worsening TR
when it is present, there is no indication to repair functional TR prior
to their implantation. In general, functional TR responds to reducing
the pulmonary pressures when pulmonary hypertension is present,
but it is not indicated without treating the RV afterload problem.
And finally, while reducing TR may reduce the volume overload on the
RA and reduce atrial arrhythmias, it is currently not considered a
primary indication for intervening on the tricuspid valve in functional
TR.
References
•
Nishimura RA, Otto CM, Bonow RO, et al. 2014 AHA/ACC Guideline for the Management of Patients With Valvular Heart Disease: A Report of the
American College of Cardiology/American Heart Association Task Force on Practice Guidelines. J Am Coll Cardiol 2014;63:e57-185.
Answer 22
Question 23
While the valvular heart disease guidelines generally focus on interventional criteria
for individual valves and individual lesions (either stenosis or regurgitation), some
patients present with mixed valvular disease, where both stenosis and regurgitation
are present. The gradients and resultant ventricular volumes are greatly affected by
both regurgitation and stenosis, making the traditional thresholds for intervention
likely unreliable in some cases.
As a general construct, which of the following is correct regarding the decision to
intervene in mixed valvular heart disease?
A.
Use the guideline criteria for the stenotic rather than the regurgitant lesion
B.
Use the guideline criteria for the regurgitant rather than the stenotic lesion
C.
Use the criteria for the dominant valvular lesion
D.
Do not use lesion guideline criteria, but rather intervene only for symptoms
Question 23
While the valvular heart disease guidelines generally focus on interventional criteria
for individual valves and individual lesions (either stenosis or regurgitation), some
patients present with mixed valvular disease, where both stenosis and regurgitation
are present. The gradients and resultant ventricular volumes are greatly affected by
both regurgitation and stenosis, making the traditional thresholds for intervention
likely unreliable in some cases.
As a general construct, which of the following is correct regarding the decision to
intervene in mixed valvular heart disease?
A.
Use the guideline criteria for the stenotic rather than the regurgitant lesion
B.
Use the guideline criteria for the regurgitant rather than the stenotic lesion
C.
Use the criteria for the dominant valvular lesion
D.
Do not use lesion guideline criteria, but rather intervene only for symptoms
Answer 23
The correct answer is C. As a generality, it is generally best to utilize the criteria for
the dominant lesion. For instance, if there is severe AS and only mild-moderate AR,
then the AS criteria prevail. Conversely, if there is mild-moderate AS with severe AR,
then the AR criteria would prevail. Options A and B are therefore incorrect, as is
option D. Many patients with mixed valve disease develop hemodynamic
consequences earlier than the severity of either lesion might predict. For instance,
pulmonary hypertension would be expected earlier in mixed mitral stenosis/MR.
Similarly, a reduced LV end-systolic dimension or EF might be expected earlier in mixed
AS/AR disease than anticipated with either alone.
The decision to intervene often comes down to a clinical judgment call. Exercise
testing may help if cardiac limitation can be demonstrated in those apparently
asymptomatic. Although unstudied at this point, other parameters, such as biomarkers
may also be of value in the future.
References
•
Nishimura RA, Otto CM, Bonow RO, et al. 2014 AHA/ACC Guideline for the Management of Patients With Valvular Heart Disease: A Report of the
American College of Cardiology/American Heart Association Task Force on Practice Guidelines. J Am Coll Cardiol 2014;63:e57-185.
Question 24
You are consulted to see a 58-year-old man, who underwent cardiac surgery for severe, symptomatic AS
due to a bicuspid valve yesterday. During surgery, he receives a mechanical bileaflet aortic valve. The
surgeon also performs root repair to treat mild dilatation of the thoracic aorta (mid-ascending aortic
diameter, 45 mm). A postoperative echocardiogram shows the valve to be functioning normally (mean
gradient, 9 mm Hg) with a LVEF 65%. The patient’s hospital course has been uncomplicated. There is no
history of prior stroke or atrial fibrillation.
The surgical team has asked you to initiate antithrombotic therapy for the aortic valve prosthesis. Which
of the following is the most appropriate next step?
A.
Warfarin, goal 3.5-4.5.
B.
Aspirin 81 mg daily; warfarin, INR goal 2.0-3.0.
C.
Warfarin, INR goal 2.5-3.5.
D.
Dabigatran, 110 mg twice daily.
E.
Dabigatran, 150 mg twice daily.
Question 24
You are consulted to see a 58-year-old man, who underwent cardiac surgery for severe, symptomatic AS
due to a bicuspid valve yesterday. During surgery, he receives a mechanical bileaflet aortic valve. The
surgeon also performs root repair to treat mild dilatation of the thoracic aorta (mid-ascending aortic
diameter, 45 mm). A postoperative echocardiogram shows the valve to be functioning normally (mean
gradient, 9 mm Hg) with a LVEF 65%. The patient’s hospital course has been uncomplicated. There is no
history of prior stroke or atrial fibrillation.
The surgical team has asked you to initiate antithrombotic therapy for the aortic valve prosthesis. Which
of the following is the most appropriate next step?
A.
Warfarin, goal 3.5-4.5
B.
Aspirin 81 mg daily; warfarin, INR goal 2.0-3.0
C.
Warfarin, INR goal 2.5-3.5
D.
Dabigatran, 110 mg twice daily
E.
Dabigatran, 150 mg twice daily
Answer 24
•
•
•
•
The correct answer is B. Warfarin is indicated with a target INR of 2.0-3.0 in patients with bileaflet
or Medtronic Hall mechanical aortic valve prosthesis, who do not have high-risk features, such as LV
dysfunction, atrial fibrillation, prior thromboembolism, and hypercoagulable conditions.
In patients with high-risk features, a Starr Edwards valve, or a disc valve besides a Medtronic Hall
valve, warfarin is indicated with a target INR of 2.5-3.5.
The addition of low-dose aspirin has been shown to decrease the risk of thromboembolism for
patients with all prosthetic heart valves.
Dabigatran is not indicated for antithrombotic therapy of prosthetic heart valves.
References
•
Nishimura RA, Otto CM, Bonow RO, et al. 2014 AHA/ACC Guideline for the Management of Patients With Valvular Heart Disease: A
Report of the American College of Cardiology/American Heart Association Task Force on Practice Guidelines. J Am Coll Cardiol
2014;63:e57-185.
•
Turpie AG, Gent M, Laupacis A, et al. A comparison of aspirin with placebo in patients treated with warfarin after heart-valve
replacement. N Engl J Med 1993;329:524-9.
•
Altman R, Rouvier J, Gurfinkel E, et al. Comparison of two levels of anticoagulant therapy in patients with substitute heart valves. J
Thorac Cardiovasc Surg 1991;101:427-31.
•
Albertal J, Sutton M, Pereyra D, et al. Experience with moderate intensity anticoagulation and aspirin after mechanical valve
replacement: a retrospective, non-randomized study. J Heart Valve Dis 1993;2:302-7.
•
Hayashi J, Nakazawa S, Oguma F, Miyamura H, Eguchi S. Combined warfarin and antiplatelet therapy after St. Jude Medical valve
replacement for mitral valve disease. J Am Coll Cardiol 1994;23:672-7.
•
Cappelleri JC, Fiore LD, Brophy MT, Deykin D, Lau J. Efficacy and safety of combined anticoagulant and antiplatelet therapy versus
anticoagulant monotherapy after mechanical heart-valve replacement: a meta analysis. Am Heart J 1995;130:547-52.
Question 25
A 43-year-old woman who has had a prior mechanical AVR is admitted to the
coronary care unit following 2 weeks of progressive dyspnea and now frank
pulmonary edema. She has had a long history of poor medical compliance
and the admission INR was 1.0, suggesting that she had not been taking her
warfarin. Her past history is notable for two prior cardiac surgeries, both for
endocarditis treatment. Because of family issues and finances, she stopped
getting regular checks of her INR approximately 1 year ago, although she
claims she generally took all her medicines.
On examination, she is anxious and in respiratory distress and hypotensive.
She is afebrile, with a loud aortic regurgitant murmur evident. She initially
responds to continuous positive airway pressure, intravenous diuresis, and
inotropes. A heparin drip is started. An emergency echocardiogram reveals
severe AS and regurgitation, with a questionable large mass on the aortic
valve. A fluoroscopic view of the aortic valve reveals one leaflet frozen in the
open position.
Question 25
Based on the clinical situation, which of the following is
the next best step?
A. Begin fibrinolytic therapy with tissue plasminogen
activator
A. Begin fibrinolytic therapy with streptokinase
A. Continue the heparin and observe for 24 more hours
A. Refer for emergency surgery
Question 25
Based on the clinical situation, which of the following is
the next best step?
A. Begin fibrinolytic therapy with tissue plasminogen
activator
A. Begin fibrinolytic therapy with streptokinase
A. Continue the heparin and observe for 24 more hours
A. Refer for emergency surgery
Answer 25
The correct answer is D. In a patient with a probable large thrombus burden and
evidence for severe prosthetic valve dysfunction with Class III or IV symptoms, surgical
removal of the thrombus is indicated. A TEE would also have been useful to
characterize the valve and provide an estimate of the thrombus size, but in some
cases, it is simply easier to use fluoroscopy; in this case, it was diagnostic. Answers A
and B are reasonable therapies only in those with NYHA functional class I or II
symptoms. The risk is obviously that of embolization of the thrombus, and it appears
the larger the thrombus, the more likely it will result in a clinical embolus. Those >0.8
cm2 are particularly prone to emboli. Other risks of using fibrinolytics include active
internal bleeding, history of hemorrhagic stroke, recent cranial trauma or neoplasm,
diabetic hemorrhagic retinopathy, hyper- or hypotension, shock, or Class III or IV
symptoms.
Current guidelines suggest that those with large emboli and Class III/IV symptoms
should be treated with emergency surgery (Class IIa; Level of Evidence B).
References
•
Nishimura RA, Otto CM, Bonow RO, et al. 2014 AHA/ACC Guideline for the Management of Patients With Valvular Heart Disease: A Report of the
American College of Cardiology/American Heart Association Task Force on Practice Guidelines. J Am Coll Cardiol 2014;63:e57-185.
Question 26
A 71-year-old man returns for follow-up of his prosthetic aortic valve. He had a 23 mm bioprosthetic
valve placed 16 years ago and has done well. His initial echocardiograms revealed minimal gradient, but
over the last few years, progressive evidence for worsening AS with mild AR has been demonstrated. He
is active and denies any symptoms of exertional dyspnea, chest pressure, or dizziness. He has no
palpitations, orthopnea, paroxysmal nocturnal dyspnea, or edema. His exam is normal except for the
median sternotomy scar and a grade 3/6 mid-peaking AS murmur with trivial AR. An S4 is also present.
An echocardiogram is obtained with the following information:
• LVEF 55%
• LV end-diastole 4.9 cm
• LV end-systole 2.3 cm
• LV wall thickness 1.1 cm
• Aortic gradients: peak instantaneous velocity: 4.3 m/sec; mean gradient: 44 mm Hg
• AVA: 0.8 cm2
• Mild AR
• No TR jet to estimate pulmonary pressures
Answer 26
Based on these data, which of the following should
be your next step for this patient?
A. Refer for redo AVR
A. Refer for TAVR valve-in-valve replacement.
A. Exercise test
B. D.TEE
Answer 26
Based on these data, which of the following should
be your next step for this patient?
A. Refer for redo AVR
A. Refer for TAVR valve-in-valve replacement.
A. Exercise test
B. D.TEE
Answer 26
The correct answer is C. Patients with prosthetic valve stenosis are generally handled similarly to those
with native valve stenosis. The patient has severe AS, yet denies symptoms. His valve is severe, but not
super-severe (mean gradient >60 mm Hg); thus, an exercise test is appropriate to assess. This should be
done with a physician on hand. The test should be considered positive if there are any symptoms
provoked, if there is an abnormal hemodynamic response (i.e., hypotension or a lack of rise >20 mm Hg
in systemic blood pressure with stress, or ST abnormalities develop). By using this method, up to 29% of
patients thought to be asymptomatic can be identified as being limited by the aortic valve stenosis.
At times, the stenosis observed after surgery is simply due to too small a valve being utilized at the
procedure. This is referred to as “patient-prosthetic mismatch.” Because of this, it is important to always
obtain an echocardiogram early after the surgical procedure. Severe mismatch is considered present in
AVR when the AVA is <0.65 cm2.
At the current time, if replacement is required, surgical AVR is still recommended. TAVR has been
performed for relief of bioprosthetic valve regurgitation and/or stenosis, and it appears very promising
that this will be a viable option in the future. No additional information is likely to be gleaned from a
TEE, given the results of chest wall echo in this particular patient.
References
•
Nishimura RA, Otto CM, Bonow RO, et al. 2014 AHA/ACC Guideline for the Management of Patients With Valvular Heart Disease: A Report of the American College of
Cardiology/American Heart Association Task Force on Practice Guidelines. J Am Coll Cardiol 2014;63:e57-185.
Question 27
A 36-year-old woman is seen for evaluation of a new murmur. She underwent bioprosthetic AVR 14
years earlier for a stenotic bicuspid aortic valve. She is active, but has mild dyspnea on exertion and mild
fatigue. She has not had anorexia or fever. She is on no medications. She is afebrile and her blood
pressure is 132/60 mmm Hg and heart rate is 90 bpm. She has 5 cm jugular venous distention when
upright. Chest examination is clear, and there is a grade 3/6 systolic ejection murmur at the left upper
sternal border along with a grade 3/4 decrescendo diastolic murmur at the left lower sternal border.
A TTE is ordered and reveals an aortic valve that appears to have a mass or calcium on the leaflets.
There is poor mobility of the leaflets and evidence for severe AR and moderate AS.
Which of the following is the best next step for this patient?
A.
TEE
A.
Nifedipine sustained release orally 30 mg daily
A.
Repeat TTE in 6 months
A.
Redo AVR
A.
Lisinopril orally 5 mg daily
Question 27
A 36-year-old woman is seen for evaluation of a new murmur. She underwent bioprosthetic AVR 14
years earlier for a stenotic bicuspid aortic valve. She is active, but has mild dyspnea on exertion and mild
fatigue. She has not had anorexia or fever. She is on no medications. She is afebrile and her blood
pressure is 132/60 mmm Hg and heart rate is 90 bpm. She has 5 cm jugular venous distention when
upright. Chest examination is clear, and there is a grade 3/6 systolic ejection murmur at the left upper
sternal border along with a grade 3/4 decrescendo diastolic murmur at the left lower sternal border.
A TTE is ordered and reveals an aortic valve that appears to have a mass or calcium on the leaflets.
There is poor mobility of the leaflets and evidence for severe AR and moderate AS.
Which of the following is the best next step for this patient?
A.
TEE
A.
Nifedipine sustained release orally 30 mg daily
A.
Repeat TTE in 6 months
A.
Redo AVR
A.
Lisinopril orally 5 mg daily
Answer 27
The correct answer is D. The patient has obvious prosthetic
degenerative valve failure with severe AR and early symptoms
of exertional dyspnea. She should be referred for redo AVR.
The mass could represent a vegetation, but there is no clinical
evidence for endocarditis.
Afterload reduction with either nifedipine or lisinopril is not
needed unless there is associated systemic hypertension.
She has severe AR and should be referred for redo AVR, as the
diagnosis is clear at this time.
References
•
Nishimura RA, Otto CM, Bonow RO, et al. 2014 AHA/ACC Guideline for the Management of Patients With Valvular Heart Disease: A Report of the American College of
Cardiology/American Heart Association Task Force on Practice Guidelines. J Am Coll Cardiol 2014;63:e57-185.
Question 28
A 20-year-old woman with a history of mitral valve repair 2 years prior (for MR due to mitral prolapse) is
admitted with fever of unknown cause. She has been feeling poorly for at least 2 months and notes her
temperature tends to increase in the evening. She generally can get the temperature down with
acetaminophen and has been able to go to school. She has lost a few pounds, but has no other specific
complaints. She initially went to urgent care, where she was prescribed azithromycin. She has taken this
for the last 3 days.
On examination, she is mildly febrile (37.8°C) and tachycardic at 105. Her blood pressure is 100/75 mm
Hg. Her lungs are clear. Cardiac exam reveals no jugular venous distention, no CV wave, and no
hepatojugular reflux. Her carotid is normal. Apex is hyperdynamic with no thrills. On auscultation, there
is a grade 3/6 MR murmur radiating to the axilla and back with an associated S3. The remainder of her
exam is normal, with no peripheral stigmata for endocarditis.
An echocardiogram is obtained, and it reveals severe MR with a bright target observed on the anterior
leaflet that is officially read as either calcium or possible vegetation. LV function is normal, and there are
no other abnormalities observed.
You order two sets of blood cultures and admit her to the hospital. After 24 hours, neither set of
cultures is positive for any growth of bacteria.
Question 28
The next step should be which of the following?
A. Begin treatment for culture-negative endocarditis with
ampicillin and gentamicin.
A. Begin treatment for culture-negative endocarditis with
vancomycin and rifampin.
A. Draw another set of blood cultures and observe with no
antibiotics.
A. Send off titers for Coxiella burnettii (Q fever).
Question 28
The next step should be which of the following?
A. Begin treatment for culture-negative endocarditis with
ampicillin and gentamicin.
A. Begin treatment for culture-negative endocarditis with
vancomycin and rifampin.
A. Draw another set of blood cultures and observe with no
antibiotics.
A. Send off titers for Coxiella burnettii (Q fever).
Answer 28
The correct answer is C. The patient has evidence for fever and the clinical
scenario where endocarditis is certainly possible. You are given no prior
exams to know if the MR is new or worse from previous exams. The target on
the mitral valve is not definitive and a TEE would be indicated to better define
the lesion.
She took antibiotics from the urgent care; thus, the lack of positivity of the
initial blood cultures may not confirm culture-negative endocarditis.
Antibiotics should not be initiated until cultures have been obtained that have
not been potentially influenced by prior antibiotic therapy.
At this stage, she does not meet the modified Duke criteria for endocarditis,
and a second set of cultures should be obtained and no therapy initiated until
these results are back.
If the cultures then become positive, antibiotic therapy can be initiated,
which is appropriate for the infecting organism.
References
•
Nishimura RA, Otto CM, Bonow RO, et al. 2014 AHA/ACC Guideline for the Management of Patients With Valvular Heart Disease: A Report of the
American College of Cardiology/American Heart Association Task Force on Practice Guidelines. J Am Coll Cardiol 2014;63:e57-185.
• Consider Modified Duke Criteria
• Consider Culture Neg Endocarditis
• Consider HACEK organisms
Question 29
You are asked to see a 23-year-old pregnant woman who is nearing the end of her
second trimester. She has had continuous prenatal care, but her physician noted she
seems to be having more respiratory symptoms than he would have expected, and he
ordered a cardiac echo/Doppler. It revealed that she has severe mitral stenosis
unbeknownst to anyone before the pregnancy. You initially see her and begin
hydrocholorothiazide to help with the congestive symptoms and metoprolol to try to
slow her heart rate. Despite this, she continues to demonstrate worsening dyspnea.
•
Which of the following is the next best step?
A.
Surgical mitral valve replacement
A.
Balloon mitral valvuloplasty if echo score is satisfactory and MR <2+.
A.
Consider a therapeutic abortion.
A.
Continue to treat medically until the baby is considered viable, then a C-section.
Question 29
You are asked to see a 23-year-old pregnant woman who is nearing the end of her
second trimester. She has had continuous prenatal care, but her physician noted she
seems to be having more respiratory symptoms than he would have expected, and he
ordered a cardiac echo/Doppler. It revealed that she has severe mitral stenosis
unbeknownst to anyone before the pregnancy. You initially see her and begin
hydrocholorothiazide to help with the congestive symptoms and metoprolol to try to
slow her heart rate. Despite this, she continues to demonstrate worsening dyspnea.
•
Which of the following is the next best step?
A.
Surgical mitral valve replacement
A.
Balloon mitral valvuloplasty if echo score is satisfactory and MR <2+.
A.
Consider a therapeutic abortion.
A.
Continue to treat medically until the baby is considered viable, then a C-section.
Answer 29
The correct answer is B. Pregnancy complicates the care of patients with valvular heart disease. As a
generality, regurgitant valvular lesions are tolerated much better than stenotic lesions, as pregnancy
incurs a marked afterload reduction due to the placental flow, but a marked increase in cardiac output
requirement. During the first 2 trimesters, much of the cardiac output is accomplished by increasing the
stroke volume, while heart rate increases dominate during the third trimester. The gradient in mitral
stenosis is dependent on both the stroke volume through the valve and the amount of diastolic time. As
the heart rate increases in the third trimester, diastolic time falls and the gradient further worsens,
making option D a difficult choice.
The Food and Drug Administration (FDA) considers hydrocholorothiazide a Class B agent and
appropriate in pregnancy. Although all of the beta-blockers are considered Class C drugs, they are
routinely given and approved by the guidelines. There are many studies validating the use of
percutaneous mitral valvuloplasty during pregnancy, and there is little risk to the fetus from the
procedure or the radiation during the second and third trimester. Surgical mitral valve replacement can
be done, but at an increased fetal risk, with the time period between the 20th and 28th week
representing the least risk. If the valve is amenable to commissurotomy, then a percutaneous approach
is preferred.
References
•
Nishimura RA, Otto CM, Bonow RO, et al. 2014 AHA/ACC Guideline for the Management of Patients With Valvular Heart Disease: A Report of the American College of
Cardiology/American Heart Association Task Force on Practice Guidelines. J Am Coll Cardiol 2014;63:e57-185.
Question 30
Which of the following statements best describes the frequency of follow-up of
various valve conditions in the absence of symptoms?
A.
One year for AVA 0.9 cm2 and mitral valve area 1.5 cm2.
A.
One year for MR vena contracta 0.3 cm and aortic insufficiency vena contracta
0.3 cm.
B.
Two years for aortic velocity 4.5 m/s and mitral diastolic pressure half-time of
200 msec.
A.
Two years for MR ERO 45 cm2 and aortic insufficiency jet width 70% of LV
outflow tract.
B.
One year for MR ERO 20 cm2 and aortic insufficiency jet width 25% of LV outflow
tract.
Question 30
Which of the following statements best describes the frequency of follow-up of
various valve conditions in the absence of symptoms?
A.
One year for AVA 0.9 cm2 and mitral valve area 1.5 cm2.
A.
One year for MR vena contracta 0.3 cm and aortic insufficiency vena contracta
0.3 cm.
B.
Two years for aortic velocity 4.5 m/s and mitral diastolic pressure half-time of
200 msec.
A.
Two years for MR ERO 45 cm2 and aortic insufficiency jet width 70% of LV
outflow tract.
B.
One year for MR ERO 20 cm2 and aortic insufficiency jet width 25% of LV outflow
tract.
Answer 30
The correct answer is A. AVA 0.9 cm2 and mitral valve area 1.5 cm2 are
severe valvular lesions; in general, all hemodynamically severe valvular
lesions should be followed echocardiographically on an annual basis in the
absence of symptoms. The other choices either describe mild lesions (when
surveillance echocardiographic follow-up every 3-5 years suffices) or severe
lesions that should be followed more closely. These recommendations are
predicated on the potential for silent and variable progression of the lesion as
well as the potential for progressive LV dysfunction or enlargement and/or
the development of other concomitant valvular heart disease.
Option B describes mild MR and aortic insufficiency; thus, follow-up should
be 3-5 years. Option C describes severe AS and mitral stenosis; thus, followup should be 1 year. Option D describes severe MR and aortic insufficiency;
thus, follow-up should be 1 year. Option E describes mild MR and aortic
insufficiency; thus follow-up should be 3-5 years.