short communication heart rate and gas exchange in freely diving
... (AT= 45) mlO2g~' h~'] are close to or above the Vo2mas determined for surfaceswimming mink (Williams, 1983). In view of the estimated 5- to 10-fold reduction in body drag during submerged swimming (Williams, 1983), the present values appear high. The probable reason for this is that the mink engaged ...
... (AT= 45) mlO2g~' h~'] are close to or above the Vo2mas determined for surfaceswimming mink (Williams, 1983). In view of the estimated 5- to 10-fold reduction in body drag during submerged swimming (Williams, 1983), the present values appear high. The probable reason for this is that the mink engaged ...
Cardiac arrhythmias
... cardiothoracic surgery, cardiomyopathy, myocarditis or pulmonary disease. Patients with the arrhythmia but no organic heart disease are said to have ‘lone atrial fibrillation’. Atrial fibrillation may be paroxysmal and convert to sinus rhythm spontaneously or easily after medical or electrical treatme ...
... cardiothoracic surgery, cardiomyopathy, myocarditis or pulmonary disease. Patients with the arrhythmia but no organic heart disease are said to have ‘lone atrial fibrillation’. Atrial fibrillation may be paroxysmal and convert to sinus rhythm spontaneously or easily after medical or electrical treatme ...
Solid Tumour Section Heart: Cardiac Myxoma Atlas of Genetics and Cytogenetics
... IgM and IgA fractions. These are associated with elevated erythrocyte sedimentation rate and C-reactive protein levels. Full blood examination may reveal anaemia. Up to 33% of cardiac myxoma patients will suffer haemolytic anaemia due to the mechanical effects of the tumour on the formed elements of ...
... IgM and IgA fractions. These are associated with elevated erythrocyte sedimentation rate and C-reactive protein levels. Full blood examination may reveal anaemia. Up to 33% of cardiac myxoma patients will suffer haemolytic anaemia due to the mechanical effects of the tumour on the formed elements of ...
Measurement of right ventricular volume in healthy term and preterm
... Pulmonary hypertension is associated with increased morbidity and mortality in cardiorespiratory disorders such as persistent pulmonary hypertension of the newborn and respiratory distress syndrome.8 Right ventricular pathophysiology is potentially important in these conditions. The ability of the r ...
... Pulmonary hypertension is associated with increased morbidity and mortality in cardiorespiratory disorders such as persistent pulmonary hypertension of the newborn and respiratory distress syndrome.8 Right ventricular pathophysiology is potentially important in these conditions. The ability of the r ...
Left ventricular diastolic collapse in regional left heart
... defined as a discrete, transient, inward motion of the left ventricular free wall adjacent to the pericardial effusion in diastole, was noted (Fig . 2) . The infusion was terminated when the mean arterial pressure was reduced to 75% of that in the control state, a condition defined as decompensated ...
... defined as a discrete, transient, inward motion of the left ventricular free wall adjacent to the pericardial effusion in diastole, was noted (Fig . 2) . The infusion was terminated when the mean arterial pressure was reduced to 75% of that in the control state, a condition defined as decompensated ...
Average T-wave alternans activity in ambulatory ECG records
... Data are presented as absolute frequencies and percentages and as mean ⫾ standard deviation. ACE ⫽ angiotensin-converting enzyme; ARB ⫽ angiotensin receptor blocker; LVEF ⫽ left ventricular ejection fraction; NYHA ⫽ New York Heart Association; TWA⫹ ⫽ T-wave alternans positive group; TWA⫺ ⫽ T-wave al ...
... Data are presented as absolute frequencies and percentages and as mean ⫾ standard deviation. ACE ⫽ angiotensin-converting enzyme; ARB ⫽ angiotensin receptor blocker; LVEF ⫽ left ventricular ejection fraction; NYHA ⫽ New York Heart Association; TWA⫹ ⫽ T-wave alternans positive group; TWA⫺ ⫽ T-wave al ...
Premature Closure of the Mitral and Tricuspid Valves
... ventricular diastolic flow period. This implies that ventricular filling from atrial systolic contraction was not important in the maintenance of an effective stroke output at these heart rates. Furthermore the modest elevations in left atrial and pulmonary artery pressures in both the human and exp ...
... ventricular diastolic flow period. This implies that ventricular filling from atrial systolic contraction was not important in the maintenance of an effective stroke output at these heart rates. Furthermore the modest elevations in left atrial and pulmonary artery pressures in both the human and exp ...
intracardiac shunting revealed by angiocardiography in the lizard
... the vena cava superior of the left-hand lizard (Fig. 2A) towards the end of a long apnoeic period (>3min). Contrast medium is apparent in all the cardiac outflow vessels. While the right aorta and the carotid arteries derived from it show rather faint contrast, the left aorta and the pulmonary arter ...
... the vena cava superior of the left-hand lizard (Fig. 2A) towards the end of a long apnoeic period (>3min). Contrast medium is apparent in all the cardiac outflow vessels. While the right aorta and the carotid arteries derived from it show rather faint contrast, the left aorta and the pulmonary arter ...
Ventricular Arrhythmias in Adult Aortic Stenosis
... hypertensive subjects with and only in 17% of those without LVH, indicating that the increase in myo¬ cardial mass may represent an anatomic substrate for ventricular arrhythmias. In 40 hypertensive patients with documented LVH and history of syncope and aborted sudden death, Vester and coauthors23 ...
... hypertensive subjects with and only in 17% of those without LVH, indicating that the increase in myo¬ cardial mass may represent an anatomic substrate for ventricular arrhythmias. In 40 hypertensive patients with documented LVH and history of syncope and aborted sudden death, Vester and coauthors23 ...
Electrophysiological recognition of an atrio
... her father died of a MI; she has no other cardiovascular risk factors. Her examination was unremarkable: no added heart sounds were audible and no signs of vascular disease noted. The 12-lead ECG revealed a short PR interval (90 ms), pre-excitation delta waves and large R waves in V1. This patient w ...
... her father died of a MI; she has no other cardiovascular risk factors. Her examination was unremarkable: no added heart sounds were audible and no signs of vascular disease noted. The 12-lead ECG revealed a short PR interval (90 ms), pre-excitation delta waves and large R waves in V1. This patient w ...
Peri-operative Cardiac Arrhythmias
... Life-threatening cardiovascular events under anaesthesia are uncommon. However, adverse cardiovascular events occurring during and after the emergence of anaesthesia occur more frequently. Although the incidence is higher during cardiac surgery, intra-operative dysrrhythmias affect up to 29% of pati ...
... Life-threatening cardiovascular events under anaesthesia are uncommon. However, adverse cardiovascular events occurring during and after the emergence of anaesthesia occur more frequently. Although the incidence is higher during cardiac surgery, intra-operative dysrrhythmias affect up to 29% of pati ...
coronary artery anomalies DR SANMATH
... the lumen of any one of the four cardiac chambers, the coronary sinus or its tributary veins, or the superior vena cava, pulmonary artery or pulmonary veins close to the heart. ...
... the lumen of any one of the four cardiac chambers, the coronary sinus or its tributary veins, or the superior vena cava, pulmonary artery or pulmonary veins close to the heart. ...
PDF Full-text
... Rotary blood pumps consist of an inlet and outlet with a single rotating element (impeller) that transfers energy to the blood in order to increase arterial blood flow and pressure. These devices can be axial, radial (centrifugal) and diagonal (mixed flow) according to the geometry of the impeller. ...
... Rotary blood pumps consist of an inlet and outlet with a single rotating element (impeller) that transfers energy to the blood in order to increase arterial blood flow and pressure. These devices can be axial, radial (centrifugal) and diagonal (mixed flow) according to the geometry of the impeller. ...
Myocardial bridges and left coronary artery trifurcation: a case report
... congenital and symptoms related to them in childhood are rare, and chronobiological extrinsic factors should influence the progression or not this entity. Furthermore, the appearance of symptoms and signs in patients who were asymptomatic can be explained by anatomical and functional changes in coro ...
... congenital and symptoms related to them in childhood are rare, and chronobiological extrinsic factors should influence the progression or not this entity. Furthermore, the appearance of symptoms and signs in patients who were asymptomatic can be explained by anatomical and functional changes in coro ...
Assessment of Heart Rates and Blood Pressure in
... HR in the prostrate position reduced significantly. We hypothesise that in the standing position, venous return decreased due to “venous pooling” in the lower limbs arising from the gravitational effects28). This decrease in venous return would have lead to a reduced cardiac output, leading to a red ...
... HR in the prostrate position reduced significantly. We hypothesise that in the standing position, venous return decreased due to “venous pooling” in the lower limbs arising from the gravitational effects28). This decrease in venous return would have lead to a reduced cardiac output, leading to a red ...
Aortic Insufficiency
... particularly loud due to the reduced forward output. A second diastolic murmur, the Austin Flint murmur, is a mid diastolic rumble similar to mitral stenosis best heard at the apex. Possible mechanisms of this murmur include relative mitral stenosis from the regurgitant jet displacing the anterior m ...
... particularly loud due to the reduced forward output. A second diastolic murmur, the Austin Flint murmur, is a mid diastolic rumble similar to mitral stenosis best heard at the apex. Possible mechanisms of this murmur include relative mitral stenosis from the regurgitant jet displacing the anterior m ...
the relative importance of nervous, humoral and intrinsic
... flow measured by this technique has been termed ' stroke flow' and it is taken as an indication of stroke volume. A previous investigation has shown that these values represent approximately 37% °f t n e actual cardiac output and stroke volume respectively, and that the same proportion of blood flow ...
... flow measured by this technique has been termed ' stroke flow' and it is taken as an indication of stroke volume. A previous investigation has shown that these values represent approximately 37% °f t n e actual cardiac output and stroke volume respectively, and that the same proportion of blood flow ...
Images and Case Reports in Heart Failure
... 61-year-old female underwent implantation of a Heartmate II left ventricular assist device (LVAD; Thoratec Corporation, Pleasanton, CA) for end-stage nonischemic cardiomyopathy. Six months later, she presented with chest pain and worsening heart failure symptoms. Computed tomography angiography reve ...
... 61-year-old female underwent implantation of a Heartmate II left ventricular assist device (LVAD; Thoratec Corporation, Pleasanton, CA) for end-stage nonischemic cardiomyopathy. Six months later, she presented with chest pain and worsening heart failure symptoms. Computed tomography angiography reve ...
Detection of Trabeculae and Papillary Muscles in Cardiac MR Images
... Few experiments have been performed on the usefulness of MRI in imaging right ventricular wall abnormalities. However, the 1998 task force of the European society of cardiology lists MRI as probably the best imaging technique for demonstrating structural and functional abnormalities of the right ven ...
... Few experiments have been performed on the usefulness of MRI in imaging right ventricular wall abnormalities. However, the 1998 task force of the European society of cardiology lists MRI as probably the best imaging technique for demonstrating structural and functional abnormalities of the right ven ...
Exenatide infusion decreases atrial natriuretic peptide levels by
... hospitalization for CHF according to NYHA III-IV criteria, left ventricular (LV) systolic dysfunction with a documented LV ejection fraction of ≤35 % (assessed by echocardiography), and clinically stable period of 24 h using established therapy [diuretics, angiotensinconverting enzyme (ACE) or ang ...
... hospitalization for CHF according to NYHA III-IV criteria, left ventricular (LV) systolic dysfunction with a documented LV ejection fraction of ≤35 % (assessed by echocardiography), and clinically stable period of 24 h using established therapy [diuretics, angiotensinconverting enzyme (ACE) or ang ...
Evaluation of Ejection Fraction in Patients with cardiac
... Introduction: Since assessment of left ventricular ejection fraction (LVEF) is crucial for evaluation of patients with cardiac resynchronization therapy (CRT) device both for selection of potential candidates for CRT as well as assessing outcome of therapy, we compared LVEF in patients with CRT devi ...
... Introduction: Since assessment of left ventricular ejection fraction (LVEF) is crucial for evaluation of patients with cardiac resynchronization therapy (CRT) device both for selection of potential candidates for CRT as well as assessing outcome of therapy, we compared LVEF in patients with CRT devi ...
Ventricular Septal Defects
... right ventricle (RV) and the primitive ventricle (PV) becomes the definitive left ventricle (LV). Stage 1: The trabecular IVS is the first to form, it grows from the apex towards the base of the heart. However, before this septum reaches the atrioventricular canal (AVC), it stops. This is because at ...
... right ventricle (RV) and the primitive ventricle (PV) becomes the definitive left ventricle (LV). Stage 1: The trabecular IVS is the first to form, it grows from the apex towards the base of the heart. However, before this septum reaches the atrioventricular canal (AVC), it stops. This is because at ...
AHEART August 46/2 - AJP
... precisely, that its behavior can be described within a phase space of finite dimension). The nonlinear predictive forecasting algorithm therefore consists of the following steps. 1) The technique of lags is used to reconstruct 8 different phase spaces with embedding dimensions from 3 to 10. 2) For e ...
... precisely, that its behavior can be described within a phase space of finite dimension). The nonlinear predictive forecasting algorithm therefore consists of the following steps. 1) The technique of lags is used to reconstruct 8 different phase spaces with embedding dimensions from 3 to 10. 2) For e ...
Flip and See ECG
... Obtaining a Patient History A complete and accurate picture of the patient can be obtained when you use an organized approach to patient history and physical examination. Experienced clinicians start their assessment with how the patient looks. They ask if there is a past cardiac history. There are ...
... Obtaining a Patient History A complete and accurate picture of the patient can be obtained when you use an organized approach to patient history and physical examination. Experienced clinicians start their assessment with how the patient looks. They ask if there is a past cardiac history. There are ...
Heart failure
Heart failure (HF), often referred to as congestive heart failure (CHF), occurs when the heart is unable to pump sufficiently to maintain blood flow to meet the body's needs. The terms chronic heart failure (CHF) or congestive cardiac failure (CCF) are often used interchangeably with congestive heart failure. Signs and symptoms commonly include shortness of breath, excessive tiredness, and leg swelling. The shortness of breath is usually worse with exercise, while lying down, and may wake the person at night. A limited ability to exercise is also a common feature.Common causes of heart failure include coronary artery disease including a previous myocardial infarction (heart attack), high blood pressure, atrial fibrillation, valvular heart disease, excess alcohol use, infection, and cardiomyopathy of an unknown cause. These cause heart failure by changing either the structure or the functioning of the heart. There are two main types of heart failure: heart failure due to left ventricular dysfunction and heart failure with normal ejection fraction depending on if the ability of the left ventricle to contract is affected, or the heart's ability to relax. The severity of disease is usually graded by the degree of problems with exercise. Heart failure is not the same as myocardial infarction (in which part of the heart muscle dies) or cardiac arrest (in which blood flow stops altogether). Other diseases that may have symptoms similar to heart failure include obesity, kidney failure, liver problems, anemia and thyroid disease.The condition is diagnosed based on the history of the symptoms and a physical examination with confirmation by echocardiography. Blood tests, electrocardiography, and chest radiography may be useful to determine the underlying cause. Treatment depends on the severity and cause of the disease. In people with chronic stable mild heart failure, treatment commonly consists of lifestyle modifications such as stopping smoking, physical exercise, and dietary changes, as well as medications. In those with heart failure due to left ventricular dysfunction, angiotensin converting enzyme inhibitors or angiotensin receptor blockers along with beta blockers are recommended. For those with severe disease, aldosterone antagonists, or hydralazine plus a nitrate may be used. Diuretics are useful for preventing fluid retention. Sometimes, depending on the cause, an implanted device such as a pacemaker or an implantable cardiac defibrillator may be recommended. In some moderate or severe cases cardiac resynchronization therapy (CRT) may be suggested or cardiac contractility modulation may be of benefit. A ventricular assist device or occasionally a heart transplant may be recommended in those with severe disease despite all other measures.Heart failure is a common, costly, and potentially fatal condition. In developed countries, around 2% of adults have heart failure and in those over the age of 65, this increases to 6–10%. In the year after diagnosis the risk of death is about 35% after which it decreases to below 10% each year. This is similar to the risks with a number of types of cancer. In the United Kingdom the disease is the reason for 5% of emergency hospital admissions. Heart failure has been known since ancient times with the Ebers papyrus commenting on it around 1550 BCE.