Difference between revisions of "Sinus Tachycardia"

From ECGpedia
Jump to navigation Jump to search
m
(No difference)

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 [1][2]). However this is often exceeded during vigorous exercise and has a large inter-individual variation.

Appropiate sinustachycardia can result from: [3]

  • exercise
  • anxiety
  • alcohol / caffeine use
  • drugs (e.g. beta-agonists like dobutamine)

The following disease states can result in sinustachycardia:

  • fever
  • hypotension
  • hypoxia
  • congestive heart failure
  • bleeding
  • anemia
  • hyperthyroidism
  • cardiomyopathy (with reduced left ventricular function and compensatory tachycardia)
  • myocarditis

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.

References

Error fetching PMID 11153730:
  1. Error fetching PMID 11153730: [Tanaka]
  2. Robergs and Landwehr. The Surprising History of the “HRmax=220-age” Equation. Journal of Exercise Physiology

    online. 2 May 2002

    [Robergs]
  3. ISBN:9780721686974 [Surawicz]