Atrial Fibrillation

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The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

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

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
Cryoballoon ablation of pulmonary veins for paroxysmal atrial fibrillation: first results of the North American Arctic Front (STOP AF) pivotal trial.
Righini, "Left atrial speckle tracking analysis in patients with mitral insufficiency and history of paroxysmal atrial fibrillation," International Journal of Cardiovascular Imaging, vol.
Detection of patients with hypertrophic cardiomyopathy at risk for paroxysmal atrial fibrillation during sinus rhythm by P-wave dispersion.
The Medical Anti-Arrhythmic Treatment of Radiofrequency Ablation in Paroxysmal Atrial Fibrillation (MANTA-PAF) study enrolled patients at centers in Denmark, Finland, Germany, and Sweden with symptomatic paroxysmal AF who were aged 70 or younger and had no prior ablation or treatment with a class 1C or III anti-arrhythmic drug.
This medication is approved to treat paroxysmal atrial fibrillation (intermittent), persistent atrial fibrillation, or atrial flutter.
using the Achieve Mapping Catheter, an intra-cardiac electrophysiology diagnostic catheter that can be used to assess pulmonary vein isolation when treating paroxysmal atrial fibrillation (PAF).
This high dose worked no better than placebo for adults with recent paroxysmal atrial fibrillation (52% (135/258) v.
A clinical trial of Medtronic Inc.'s (Minneapolis MN) cryoablation system looked at 245 patients with paroxysmal atrial fibrillation, a condition marked by intermittent episodes of abnormal heart rhythm that causes the upper chambers of the heart to quiver.
Reduced heart rate variability (HRV) has been associated with myocardial infarction and mortality in heart failure patients, and acute decreases in HRV have been reported to precede ischemic events and paroxysmal atrial fibrillation. Associations of particulate matter (PM) and traffic-related air pollution with myocardial infarction and cardiac mortality may be related to effects on HRV, but inconsistent findings of previous studies suggest that susceptibility to effects of pollution on HRV may vary.
He had a past medical history of hypertension, paroxysmal atrial fibrillation, asthma, bronchiectasis, hyperthyroidism and rheumatoid arthritis.
A YOU may be having panic attacks or have a heart condition like paroxysmal atrial fibrillation. Get a notebook and write down when you are having the symptoms, what they are like and information about what you were doing just before or at the time.
Forty-eight hours later, the patient had paroxysmal atrial fibrillation and a temperature of 39[degrees]C, with severe hemodynamic and respiratory impairment.