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Related to Sinus bradycardia: sinus arrhythmia, Sinus tachycardia


see arrhythmiaarrhythmia
, disturbance in the rate or rhythm of the heartbeat. Various arrhythmias can be symptoms of serious heart disorders; however, they are usually of no medical significance except in the presence of additional symptoms.
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The Columbia Electronic Encyclopedia™ Copyright © 2013, Columbia University Press. Licensed from Columbia University Press. All rights reserved.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



decrease in frequency of heart contractions to less than 60 beats per minute.

Bradycardia may be found as a normal, constitutionally conditioned phenomenon in perfectly healthy persons, in well-trained athletes, and as one of the symptoms in many diseases. More often, bradycardia is observed as a result of organic disturbances of auriculoventricular conductivity—heart blockage, myocardial infarction, and inflammatory (infectious or toxic) diseases of the heart muscle. Complete blockage of the heart with a pulse frequency of 30–40 beats per minute or less threatens brain complications: loss of consciousness, convulsions, and cessation of heart activity. Prophylaxis and treatment are directed toward removal of the cause.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.


Slow heart rate.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
Sinus bradycardia (sinus rhythm of less than 60 bpm) can be normal in specific instances, but specific causes such as ischemic heart disease, sick sinus syndrome, and noncardiac causes such as metabolic causes, medications, and toxins exist [1-4].
The outcomes of the study suggested that clinical use of SSYX was safe and effective for treating patients with sinus bradycardia.
Sinus bradycardia (Figure 4A) is diagnosed on the surface ECG or atrial electrogram as a P wave preceding a normal QRS complex at a rate that is slow for age and physiologic requirements.
A: Sinus bradycardia with rates as low as you describe can be a completely normal finding.
During the first 24 hours of hospitalization, their mean heart rate was 43.5 beats per minute (bpm), with 26 of 31 (84%) patients meeting criteria for sinus bradycardia (less than 50 bpm).
TIMOPTIC in OCUDOSE, TIMOPTIC, and TIMOPTIC-XE are contraindicated in patients with bronchial asthma; a history of bronchial asthma; severe chronic obstructive pulmonary disease; sinus bradycardia; second or third degree atrioventricular block; overt cardiac failure; cardiogenic shock; or hypersensitivity to any component of this product.
Two electrocardiograms (EKGs) done in the emergency room showed sinus bradycardia and nonspecific T-wave abnormalities.
Interpretation: Sinus bradycardia with an intermittent wide QRS rhythm (accelerated ventricular escape rhythm versus ventricular pacing) and a premature junctional contraction (PJC).
On February 10, 2001, he had marked sinus bradycardia (as low as 33 beats/min) and became fatigued.
A cardiac pacemaker is used to manage a heartbeat that is unusually slow, an arrhythmia called sinus bradycardia. People with bradycardia may experience symptoms such as fatigue, dizziness and fainting.
The President has a heart arrhythmia called sinus bradycardia, the White House has confirmed.