bradycardia

[brad-i-kahr-dee-uh]
noun Medicine/Medical.
a slow heartbeat rate, usually less than 60 beats per minute.

Origin:
1885–90; brady- + -cardia

bradycardic, adjective
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World English Dictionary
bradycardia (ˌbrædɪˈkɑːdɪə)
 
n
pathol Compare tachycardia an abnormally low rate of heartbeat
 
bradycardiac
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

bradycardia brad·y·car·di·a (brād'ĭ-kär'dē-ə)
n.
A slowness of the heartbeat, usually under 60 beats per minute in adults. Also called brachycardia.


brad'y·car'dic (-dĭk) or brad'y·car'di·ac' (-dē-āk') adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Encyclopedia Britannica
Encyclopedia

bradycardia

type of arrhythmia (abnormal heart rhythm) characterized by slowing of the heart rate to 60 beats per minute or less. A slow heart rate in itself may have little medical significance; bradycardia is frequent among young adults, especially in highly trained athletes or during sleep. However, bradycardia may indicate significant heart disease if accompanied by other symptoms. Bradycardia caused by a dysfunction of the sinoatrial node (sinus bradycardia), the heart's natural pacemaker, often produces weakness, confusion, palpitations, and fainting (syncope). When slowing alternates with rapid acceleration of the heart rate (tachycardia) in sick sinus syndrome or when bradycardia is accompanied by congestive heart failure or other serious complications, an artificial pacemaker may be necessary to regulate the heart rate. Another common cause of bradycardia, the blockage of electrical conduction through the atrioventricular node (heart block), is similar in its symptoms to sinus bradycardia. Bradycardia can also be produced by drugs such as digitalis or morphine and is a common abnormality in heart attack victims, for whom it often indicates a favourable prognosis.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Dangerous heart rhythms, including slow rhythms known as bradycardia, may develop.
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