|
Search over 100 encyclopedias and dictionaries: |
Research categories | Follow us on Twitter |
Research categories
View all topics in the newsView all reference sources at Encyclopedia.com |
|||
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. |
|
|
Cite this article
COLIN BLAKEMORE and SHELIA JENNETT. "bradycardia." The Oxford Companion to the Body. 2001. Encyclopedia.com. 30 May. 2012 <http://www.encyclopedia.com>. COLIN BLAKEMORE and SHELIA JENNETT. "bradycardia." The Oxford Companion to the Body. 2001. Encyclopedia.com. (May 30, 2012). http://www.encyclopedia.com/doc/1O128-bradycardia.html COLIN BLAKEMORE and SHELIA JENNETT. "bradycardia." The Oxford Companion to the Body. 2001. Retrieved May 30, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O128-bradycardia.html |
|
bradycardia
brad·y·car·di·a / ˌbradiˈkärdēə/ • n. Med. abnormally slow heart action. |
|
|
Cite this article
"bradycardia." The Oxford Pocket Dictionary of Current English. 2009. Encyclopedia.com. 30 May. 2012 <http://www.encyclopedia.com>. "bradycardia." The Oxford Pocket Dictionary of Current English. 2009. Encyclopedia.com. (May 30, 2012). http://www.encyclopedia.com/doc/1O999-bradycardia.html "bradycardia." The Oxford Pocket Dictionary of Current English. 2009. Retrieved May 30, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O999-bradycardia.html |
|
bradycardia
bradycardia An unusually slow heartbeat, less than 60 beats/min. Such a low rate may be normal in trained athletes.
|
|
|
Cite this article
DAVID A. BENDER. "bradycardia." A Dictionary of Food and Nutrition. 2005. Encyclopedia.com. 30 May. 2012 <http://www.encyclopedia.com>. DAVID A. BENDER. "bradycardia." A Dictionary of Food and Nutrition. 2005. Encyclopedia.com. (May 30, 2012). http://www.encyclopedia.com/doc/1O39-bradycardia.html DAVID A. BENDER. "bradycardia." A Dictionary of Food and Nutrition. 2005. Retrieved May 30, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O39-bradycardia.html |
|
bradycardia
bradycardia (brad-i-kar-diă) n. slowing of the heart rate to less than 50 beats per minute.
|
|
|
Cite this article
"bradycardia." A Dictionary of Nursing. 2008. Encyclopedia.com. 30 May. 2012 <http://www.encyclopedia.com>. "bradycardia." A Dictionary of Nursing. 2008. Encyclopedia.com. (May 30, 2012). http://www.encyclopedia.com/doc/1O62-bradycardia.html "bradycardia." A Dictionary of Nursing. 2008. Retrieved May 30, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O62-bradycardia.html |
|
bradycardia
bradycardia A condition in which the heart rate is reduced substantially.
|
|
|
Cite this article
MICHAEL ALLABY. "bradycardia." A Dictionary of Ecology. 2004. Encyclopedia.com. 30 May. 2012 <http://www.encyclopedia.com>. MICHAEL ALLABY. "bradycardia." A Dictionary of Ecology. 2004. Encyclopedia.com. (May 30, 2012). http://www.encyclopedia.com/doc/1O14-bradycardia.html MICHAEL ALLABY. "bradycardia." A Dictionary of Ecology. 2004. Retrieved May 30, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O14-bradycardia.html |
|
bradycardia
bradycardia A condition in which the heart rate is reduced substantially.
|
|
|
Cite this article
MICHAEL ALLABY. "bradycardia." A Dictionary of Zoology. 1999. Encyclopedia.com. 30 May. 2012 <http://www.encyclopedia.com>. MICHAEL ALLABY. "bradycardia." A Dictionary of Zoology. 1999. Encyclopedia.com. (May 30, 2012). http://www.encyclopedia.com/doc/1O8-bradycardia.html MICHAEL ALLABY. "bradycardia." A Dictionary of Zoology. 1999. Retrieved May 30, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O8-bradycardia.html |
|
bradycardia
bradycardia A decrease in heart rate. See tachycardia.
|
|
|
Cite this article
"bradycardia." A Dictionary of Biology. 2004. Encyclopedia.com. 30 May. 2012 <http://www.encyclopedia.com>. "bradycardia." A Dictionary of Biology. 2004. Encyclopedia.com. (May 30, 2012). http://www.encyclopedia.com/doc/1O6-bradycardia.html "bradycardia." A Dictionary of Biology. 2004. Retrieved May 30, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O6-bradycardia.html |
|
bradycardia
bradycardia see arrhythmia . |
|
|
Cite this article
"bradycardia." The Columbia Encyclopedia, 6th ed.. 2011. Encyclopedia.com. 30 May. 2012 <http://www.encyclopedia.com>. "bradycardia." The Columbia Encyclopedia, 6th ed.. 2011. Encyclopedia.com. (May 30, 2012). http://www.encyclopedia.com/doc/1E1-X-bradycar.html "bradycardia." The Columbia Encyclopedia, 6th ed.. 2011. Retrieved May 30, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1E1-X-bradycar.html |
|
Search over 100 encyclopedias and dictionaries:
HighBeam™ Research, Inc. © Copyright 2012. All rights reserved.
The Encyclopedia.com advertising network includes:
