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 ?
The Watchman Implant is designed to close the LAA in order to keep harmful blood clots from the LAA from entering the blood stream and potentially causing a stroke for higher risk patients with non-valvular a-fib.
Researchers at the University of California, San Francisco, reported this month in Annals of Internal Medicine that people with a high rate of premature atrial contractions, which can be detected by a Holter monitor worn for 24 hours, face a significantly increased risk of developing A-fib.
MJ is a 77-year-old female admitted for evaluation and treatment of A-fib with a rapid ventricular response and congestive heart failure.
MD, Hybrid A-Fib Ablation surgery is the latest in a range of advanced cardiac procedures available at The Heart Institute.
Conducted in partnership with 15 major medical centers across the United States, Europe, and Australia, Marrouche's landmark study demonstrated that the amount of atrial injury can effectively predict whether patients were likely to benefit from A-fib catheter ablation procedure.
Melton, an administrative assistant, first experienced A-fib at work, when she felt a burning sensation in her chest.
Pico-Tesla is currently sponsoring clinical trials for both Parkinson's disease and type-2 diabetes, and expects to begin a clinical trial for A-Fib in the fourth quarter of this year.
Accordingly, we are in discussions with leading cardiology groups regarding the design and implementation of an exploratory study involving men and women with paroxsysmal A-Fib," added Allen Braswell, CEO of Pico-Tesla.
To prevent clots from forming, patients with A-Fib are often placed on blood thinners such as Coumadin or Pradaxa.
The Heart and Vascular Institute remains one of the institutions performing among the highest proportion of complex cardiac surgery procedures in the state, including multi-valve repair, aneurysm/aortic dissection repair, transmyocardial revascularization, chronic A-fib correction, and endovascular thoracic aneurysm graft (TAG) repair.