Atrial Fibrillation

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Atrial Fibrillation

 

a cardiac arrhythmia whose basis is a disturbance in atrial activity. Atrial fibrillation often occurs with heart defects, cardiosclerosis, rheumatic endocarditis, and thyrotoxicosis, but there is no generally accepted theory to explain how it develops.

A distinction is made between paroxysmal and continuous atrial fibrillation. Continuous fibrillation may be tachyrhythmic (rapid), with a pulse of 90 to 150–180 beats per minute, or bradyrhythmic (slow), in which the pulse is never more than 60–80 beats per minute. The tachyrhythmic form is associated with sensations of palpitations, pounding, general excitement, and weakness. Patients with the bradyrhythmic form usually do not sense the arrhythmia, which is often detected only by electrocardiographic examination.

Although atrial flutter arises from the same conditions as atrial fibrillation, it is distinguished from atrial fibrillation in that the number of atrial impulses reaches 300 and the pulse may be as rapid as 240–300 beats per minute. A distinction is made between regular flutter, in which every second or third impulse travels successfully from the atria to the ventricles, and irregular flutter, in which the alternation of atrial and ventricular contractions is irregular. Atrial flutter is more difficult for patients to tolerate than is fibrillation.

Cardiac arrhythmias are treated with cardiac glycosides, quinidine, Novocainamid, Inderal, Aimalin, potassium salts, cocarboxylase, and electropulse therapy.

N. R. PALEEV

References in periodicals archive ?
This report of benefit from AFib catheter ablation in patients with HF "absolutely advances the evidence," commented Clyde W.
Catheter ablation should now be "strongly considered" in patients with heart failure and AFib, he said, although he also had three qualifications for opting for this approach: Patients must already be on guideline-directed medical therapy for their heart failure, the catheter ablation needs to be performed by an experienced and skilled operator, and follow-up surveillance must focus on both the patient's AFib and heart failure.
Cognitive decline is a precursor to dementia, so the researchers speculate that treating AFib may help slow cognitive decline and possibly prevent AFib-related dementia.
Jeff Williams, chief operating officer, Apple Inc., said that through Apple Watch people have been able to learn more about their heart health, including discovering they have AFib.
"Our analysis shows that there is a genetic predisposition to early-onset AFib in blacks and Latinos that is greater than what we see in whites," said Dr.
Atrial fibrillation (AFib) is the most common human arrhythmia, affecting about 33 million patients worldwide.
AFib can feel like the heartbeat is quivering or skipping beats.
After 24 hours of in-hospital monitoring, his doctors informed him that he had AFib and needed to take vigilant action.
Atrial fibrillation (AFib) is one of the most common arrhythmias with an increased prevalence with advancing age [1].
"AFib is so common, but many people have no symptoms, or subtle symptoms like getting winded.
-- The Food and Drug Administration has approved Pradaxa (dabigatran etexilate) capsules as a treatment to reduce the risk of stroke and systemic embolism in patients with non-valvular atrial fibrillation (AFib).