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bradycardia

bradycardia describes a heart beat which is either habitually slow, or which drops from its usual rate. In health, bradycardia may be the result of athletic training, which reduces the resting heart rate. Persons with heart block have persistent or intermittent bradycardia. Sudden bradycardia can result in a dramatic fall in cardiac output and hence in arterial blood pressure, depriving the brain of blood flow and causing a ‘black-out’. Fainting (‘syncope’) is one such instance, caused by depression of the heart's pacemaker by the parasympathetic (vagus) nerves; acute exacerbation of heart block is another. From the Greek for ‘slow’ and ‘heart’.

Stuart Judge


See heart block; syncope; fainting.

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"bradycardia." The Oxford Companion to the Body. . Encyclopedia.com. 23 Aug. 2017 <http://www.encyclopedia.com>.

"bradycardia." The Oxford Companion to the Body. . Encyclopedia.com. (August 23, 2017). http://www.encyclopedia.com/medicine/encyclopedias-almanacs-transcripts-and-maps/bradycardia

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bradycardia

brad·y·car·di·a / ˌbradiˈkärdēə/ • n. Med. abnormally slow heart action.

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"bradycardia." The Oxford Pocket Dictionary of Current English. . Encyclopedia.com. 23 Aug. 2017 <http://www.encyclopedia.com>.

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"bradycardia." The Oxford Pocket Dictionary of Current English. . Retrieved August 23, 2017 from Encyclopedia.com: http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/bradycardia

bradycardia

bradycardia An unusually slow heartbeat, less than 60 beats/min. Such a low rate may be normal in trained athletes.

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"bradycardia." A Dictionary of Food and Nutrition. . Encyclopedia.com. 23 Aug. 2017 <http://www.encyclopedia.com>.

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"bradycardia." A Dictionary of Food and Nutrition. . Retrieved August 23, 2017 from Encyclopedia.com: http://www.encyclopedia.com/education/dictionaries-thesauruses-pictures-and-press-releases/bradycardia

bradycardia

bradycardia (brad-i-kar-diă) n. slowing of the heart rate to less than 50 beats per minute.

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"bradycardia." A Dictionary of Nursing. . Encyclopedia.com. 23 Aug. 2017 <http://www.encyclopedia.com>.

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bradycardia

bradycardia A condition in which the heart rate is reduced substantially.

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"bradycardia." A Dictionary of Ecology. . Encyclopedia.com. 23 Aug. 2017 <http://www.encyclopedia.com>.

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bradycardia

bradycardia A condition in which the heart rate is reduced substantially.

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"bradycardia." A Dictionary of Zoology. . Encyclopedia.com. 23 Aug. 2017 <http://www.encyclopedia.com>.

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bradycardia

bradycardia A decrease in heart rate. See tachycardia.

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"bradycardia." A Dictionary of Biology. . Encyclopedia.com. 23 Aug. 2017 <http://www.encyclopedia.com>.

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bradycardia

bradycardia: see arrhythmia.

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"bradycardia." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. 23 Aug. 2017 <http://www.encyclopedia.com>.

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"bradycardia." The Columbia Encyclopedia, 6th ed.. . Retrieved August 23, 2017 from Encyclopedia.com: http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/bradycardia