Johns Hopkins Medicine: Atrial Fibrillation
... getting out of bed or rising from a chair—symptoms such as shortness of breath, dizziness, weakness, palpitation, or chest pain may occur, and can range from mild to severe. Some people complain that it feels as if “my heart is going to jump out of my chest.” AF, by far the most common sustained arr ...
... getting out of bed or rising from a chair—symptoms such as shortness of breath, dizziness, weakness, palpitation, or chest pain may occur, and can range from mild to severe. Some people complain that it feels as if “my heart is going to jump out of my chest.” AF, by far the most common sustained arr ...
Treatment Considerations for a Dual Epidemic of Atrial Fibrillation
... and increased mortality does not prove causality. Although the causal relationship between the AF and HF has not been fully determined, their coexistence can be explained to some degree by the presence of common risk factors such as age, hypertension, diabetes, and obesity, as well as valvular, isch ...
... and increased mortality does not prove causality. Although the causal relationship between the AF and HF has not been fully determined, their coexistence can be explained to some degree by the presence of common risk factors such as age, hypertension, diabetes, and obesity, as well as valvular, isch ...
DOWNLOAD PDF - UC Davis School of Veterinary Medicine
... years and only occasionally in younger horses. Degenerative changes affecting the heart valves, myocardium and lungs are associated with aging, increasing in frequency with age. The most commonly diagnosed conditions are heart rhythm irregularities and leaks in one or more heart valves. The most com ...
... years and only occasionally in younger horses. Degenerative changes affecting the heart valves, myocardium and lungs are associated with aging, increasing in frequency with age. The most commonly diagnosed conditions are heart rhythm irregularities and leaks in one or more heart valves. The most com ...
Permanent transvenous pacemaker implantation in a patient with
... If the communicating orifice is small, the patient shows symptoms of congestive heart failure during infancy or childhood and usually requires surgical intervention for survival. If the connection is large and non-obstructive, patient may remain asymptomatic for many years, as in our case. The clini ...
... If the communicating orifice is small, the patient shows symptoms of congestive heart failure during infancy or childhood and usually requires surgical intervention for survival. If the connection is large and non-obstructive, patient may remain asymptomatic for many years, as in our case. The clini ...
View Article
... If P waves are present, the nurse should ask, “Are there more P waves than QRS complexes?” The nurse then should follow the algorithm to the appropriate answer. ...
... If P waves are present, the nurse should ask, “Are there more P waves than QRS complexes?” The nurse then should follow the algorithm to the appropriate answer. ...
Unusual Site of Origin of a Non-Automatic Focal Right Ventricular
... The mechanism of the described VT is non-automatic. Induction by stimulation and termination by ATP, ICD shocks, and mechanically induced ventricular premature beats reliably excludes automaticity.1,7 The focal pattern of activation is compatible with micro–re-entry or epicardial or mid-myocardial m ...
... The mechanism of the described VT is non-automatic. Induction by stimulation and termination by ATP, ICD shocks, and mechanically induced ventricular premature beats reliably excludes automaticity.1,7 The focal pattern of activation is compatible with micro–re-entry or epicardial or mid-myocardial m ...
ECG
... Activity stimulates the heart to contract more vigorously than it does when the body is at rest. The EKG (electrocardiogram) sensor measures cardiac electrical potential waveforms (voltages) produced by the heart as its chambers contract. The EKG does not directly measure of heart muscle activity. A ...
... Activity stimulates the heart to contract more vigorously than it does when the body is at rest. The EKG (electrocardiogram) sensor measures cardiac electrical potential waveforms (voltages) produced by the heart as its chambers contract. The EKG does not directly measure of heart muscle activity. A ...
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... 92- which one of the following isn't true about sick sinus syndrome : a- also known as brady-tachy-syndrome b- the most important sinus arrhythmia c- caused by SA node ischemia d- most of the time the heart rate is less than 40 e- it's a physiological type and no treatment is needed ...
... 92- which one of the following isn't true about sick sinus syndrome : a- also known as brady-tachy-syndrome b- the most important sinus arrhythmia c- caused by SA node ischemia d- most of the time the heart rate is less than 40 e- it's a physiological type and no treatment is needed ...
Narrow Complex Tachycardias - Calgary Emergency Medicine
... – (intermediate): data are on the basis of a ...
... – (intermediate): data are on the basis of a ...
Sequence of Atrial Depolarization at Different Stages of
... confirmation of these findings could be made under the microscope, especially toward the end of each experiment, when the asynchronism between left and right atrial contraction was more easily noticeable. Intervals between the two atrial components as well as the P-R intervals were measured in all c ...
... confirmation of these findings could be made under the microscope, especially toward the end of each experiment, when the asynchronism between left and right atrial contraction was more easily noticeable. Intervals between the two atrial components as well as the P-R intervals were measured in all c ...
Rational Choices in Antiarrhythmic Pharmacotherapy
... high-conductance, voltage-gated Na+ channels, resulting in an increase in intracellular Na+ concentration and depolarization of the cell membrane. In phase 4, Na+ channels are in the closed state until slight depolarization of the cell reaches threshold and causes the channels to open. The channels ...
... high-conductance, voltage-gated Na+ channels, resulting in an increase in intracellular Na+ concentration and depolarization of the cell membrane. In phase 4, Na+ channels are in the closed state until slight depolarization of the cell reaches threshold and causes the channels to open. The channels ...
100708 Basic Dysrhythmias 2902KB Jan 14 2015 08:21:37 AM
... Have a heart, and have no fear, The SA node is over here. Beating at a constant rate, 60 – 100 is really great. The AV node can make a show, If SA node has gone too slow. 40 – 60 is not too bad If it’s all you’ve got, you will be glad. Should the whole thing drop it’s speed, His and bundle branches ...
... Have a heart, and have no fear, The SA node is over here. Beating at a constant rate, 60 – 100 is really great. The AV node can make a show, If SA node has gone too slow. 40 – 60 is not too bad If it’s all you’ve got, you will be glad. Should the whole thing drop it’s speed, His and bundle branches ...
Lesson 5 ELECTROCARDIOGRAPHY I
... conditions tested. The first four conditions each had an ECG recording of 20 seconds. The first condition tested was supine with regular breathing, a marker was inserted for each inhalation and exhalation. The second condition tested was [describe the other test conditions]. The subject did 30 push- ...
... conditions tested. The first four conditions each had an ECG recording of 20 seconds. The first condition tested was supine with regular breathing, a marker was inserted for each inhalation and exhalation. The second condition tested was [describe the other test conditions]. The subject did 30 push- ...
Catheter Ablation in New Zealand
... Atrial fibrillation is characterised by loss of the normal electrical rhythm of the heart (sinus rhythm), which is replaced by chaotic contraction of the atria (upper chambers of the heart) and results in an irregular, often rapid, heartbeat. It is associated with an approximate 2-fold increase in c ...
... Atrial fibrillation is characterised by loss of the normal electrical rhythm of the heart (sinus rhythm), which is replaced by chaotic contraction of the atria (upper chambers of the heart) and results in an irregular, often rapid, heartbeat. It is associated with an approximate 2-fold increase in c ...
Effect of Cardiac Resynchronization Therapy on Left Atrial Reverse
... and effective ejection time, reduces stroke volume, prolongs mitral regurgitation and leads to an increase in global and regional wall stress (Grines et al. 1989; Xiao et al. 1992; Nelson et al. 2000). Previous studies have shown that interventricular conduction delay is also an independent predicto ...
... and effective ejection time, reduces stroke volume, prolongs mitral regurgitation and leads to an increase in global and regional wall stress (Grines et al. 1989; Xiao et al. 1992; Nelson et al. 2000). Previous studies have shown that interventricular conduction delay is also an independent predicto ...
Basic ECG Interpretation Christopher Wenger, DO August 2012
... -Atrial activity is totally irregular and represented by fibrillatory waves of varying amplitude, duration and morphology, causing random oscillation of the baseline -The AV node allows some of the impulses to pass through at variable intervals ~ventricular rhythm is typically irregularly irregular ...
... -Atrial activity is totally irregular and represented by fibrillatory waves of varying amplitude, duration and morphology, causing random oscillation of the baseline -The AV node allows some of the impulses to pass through at variable intervals ~ventricular rhythm is typically irregularly irregular ...
Prioritising Summary for WATCHMAN® left atrial appendage closure
... The RCT by Holmes et al (2009) reported a higher rate of primary safety events in the intervention group compared with the control group (rate ratio [RR], 1.69; 95% credible interval [CrI], 1.01–3.19). Most of the complications (27/49 [55%]) occurring in the intervention group occurred on the day of ...
... The RCT by Holmes et al (2009) reported a higher rate of primary safety events in the intervention group compared with the control group (rate ratio [RR], 1.69; 95% credible interval [CrI], 1.01–3.19). Most of the complications (27/49 [55%]) occurring in the intervention group occurred on the day of ...
Cardiac Cycle - OpenStax CNX
... Fluids, whether gases or liquids, are materials that ow according to pressure gradientsthat is, they move from regions that are higher in pressure to regions that are lower in pressure. Accordingly, when the heart chambers are relaxed (diastole), blood will ow into the atria from the veins, which ...
... Fluids, whether gases or liquids, are materials that ow according to pressure gradientsthat is, they move from regions that are higher in pressure to regions that are lower in pressure. Accordingly, when the heart chambers are relaxed (diastole), blood will ow into the atria from the veins, which ...
Role of autonomic reflexes in syncope associated with
... Nonhemodynamic mechanisms may be even more readly suspected when heart rate is not particularly high . It is well known that the onset of paroxysmal tachycardia produces a hemodynamic disturbance that evokes a compensatory cardiovascular response (2,3) . This response, which is mediated mainly by re ...
... Nonhemodynamic mechanisms may be even more readly suspected when heart rate is not particularly high . It is well known that the onset of paroxysmal tachycardia produces a hemodynamic disturbance that evokes a compensatory cardiovascular response (2,3) . This response, which is mediated mainly by re ...
Current strategy for treatment of patient with Wolff–Parkinson–White
... The major finding from this EHRA EP network survey is that ablation in children with WPW is still performed in low numbers even in European high volume ablation centres, and the majority of centres will only perform ablation in children with overt WPW syndrome and recurrent episodes of AV reentry ta ...
... The major finding from this EHRA EP network survey is that ablation in children with WPW is still performed in low numbers even in European high volume ablation centres, and the majority of centres will only perform ablation in children with overt WPW syndrome and recurrent episodes of AV reentry ta ...
Catheter Ablation as a Treatment for Atrial Fibrillation
... appears to be located within the cardiac muscle that extends into the pulmonary veins. Atrial fibrillation accounts for approximately one third of hospitalizations for cardiac rhythm disturbances. Symptoms of atrial fibrillation, e.g., palpitations, decreased exercise tolerance, and dyspnea, are pri ...
... appears to be located within the cardiac muscle that extends into the pulmonary veins. Atrial fibrillation accounts for approximately one third of hospitalizations for cardiac rhythm disturbances. Symptoms of atrial fibrillation, e.g., palpitations, decreased exercise tolerance, and dyspnea, are pri ...
Atrial Fibrillation Begets Heart Failure and Vice Versa
... association of AF and HF with preserved versus reduced ejection fraction. Methods and Results—We studied Framingham Heart Study participants with new-onset AF or HF between 1980 and 2012. Among 1737 individuals with new AF (mean age, 75±12 years; 48% women), more than one third (37%) had HF. Convers ...
... association of AF and HF with preserved versus reduced ejection fraction. Methods and Results—We studied Framingham Heart Study participants with new-onset AF or HF between 1980 and 2012. Among 1737 individuals with new AF (mean age, 75±12 years; 48% women), more than one third (37%) had HF. Convers ...
Full Text - Archives of Cardiovascular Imaging
... (15) study showed that tissue Doppler derived strain rate can provide quantitative analysis of the regional right atrial performance in patients with TOF. They assessed 50 asymptomatic patients following corrective surgery of tetralogy of Fallot, and concluded a significantly reduced right atrial ac ...
... (15) study showed that tissue Doppler derived strain rate can provide quantitative analysis of the regional right atrial performance in patients with TOF. They assessed 50 asymptomatic patients following corrective surgery of tetralogy of Fallot, and concluded a significantly reduced right atrial ac ...
Atrial fibrillation
Atrial fibrillation (AF or A-fib) is an abnormal heart rhythm characterized by rapid and irregular beating. Often it starts as brief periods of abnormal beating which become longer and possibly constant over time. Most episodes have no symptoms. Occasionally there may be heart palpitations, fainting, shortness of breath, or chest pain. The disease increases the risk of heart failure, dementia, and stroke.Hypertension and valvular heart disease are the most common alterable risk factors for AF. Other heart-related risk factors include heart failure, coronary artery disease, cardiomyopathy, and congenital heart disease. In the developing world valvular heart disease often occurs as a result of rheumatic fever. Lung-related risk factors include COPD, obesity, and sleep apnea. Other factors include excess alcohol intake, diabetes mellitus, and thyrotoxicosis. However, half of cases are not associated with one of these risks. A diagnosis is made by feeling the pulse and may be confirmed using an electrocardiogram (ECG). The typical ECG shows no P waves and an irregular ventricular rate.AF is often treated with medications to slow the heart rate to a near normal range (known as rate control) or to convert the rhythm to normal sinus rhythm (known as rhythm control). Electrical cardioversion can also be used to convert AF to a normal sinus rhythm and is often used emergently if the person is unstable. Ablation may prevent recurrence in some people. Depending on the risk of stroke either aspirin or anti-clotting medications such as warfarin or a novel oral anticoagulant may be recommended. While these medications reduce this risk, they increase rates of major bleeding.Atrial fibrillation is the most common serious abnormal heart rhythm. In Europe and North America, as of 2014, it affects about 2% to 3% of the population. This is an increase from 0.4 to 1% of the population around 2005. In the developing world about 0.6% of males and 0.4% of females are affected. The percentage of people with AF increases with age with 0.14% under 50 years old, 4% between 60 and 70 years old, and 14% over 80 years old being affected. A-fib and atrial flutter resulted in 112,000 deaths in 2013, up from 29,000 in 1990. The first known report of an irregular pulse was by John Baptist Senac in 1749. This was first documented by ECG in 1909 by Thomas Lewis.