Difference between revisions of "Sinus Tachycardia"
Revision as of 21:32, 12 January 2010
|This is part of: Supraventricular Rhythms|
Sinustachycardia is sinus rhythm with a rate of > 100bpm.
The maximal heart rate is considered to be 220/min minus the age (or more precisely 207-0.7xAge ). However this is often exceeded during vigorous exercise and has a large inter-individual variation.
Appropiate sinustachycardia can result from: 
- alcohol / caffeine use
- drugs (e.g. beta-agonists like dobutamine)
The following disease states can result in sinustachycardia:
- congestive heart failure
- cardiomyopathy (with reduced left ventricular function and compensatory tachycardia)
Inappropiate sinustachycardia is rare and characterized by tachycardia at rest and exaggerated acceleration of the heart during physiologic stress. The mechanism leading to an exaggerated response of the sinus node to minimal physiologic stress is incompletely understood.
- Error fetching PMID 11153730:
Robergs and Landwehr. The Surprising History of the “HRmax=220-age” Equation. Journal of Exercise Physiology
online. 2 May 2002