Difference between revisions of "Sinus Tachycardia"

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Sinustachycardia is [[Sinus_node_rhythms_and_arrhythmias|sinus rhythm]] with a rate of > 100bpm.  
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Sinus tachycardia is [[Sinus_node_rhythms_and_arrhythmias|sinus rhythm]] with a rate of > 100bpm.  
  
Sinustachycardia is an examples of a [[Supraventricular Rhythms|supraventricular rhythm]].
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Sinus tachycardia is an examples of a [[Supraventricular Rhythms|supraventricular rhythm]].
In sinustachycardia the sinus node fires between 100 and 180 beats per minute and thus faster than normally. The maximal heartrate decreases with age from around 200 bpm to 140 bpm. The maximal heartrage can be estimated by subtracting the age in years from 210. Sinustachycardia normally has a gradual start and ending. Most often sinustachycardia is caused by an increase in the body's demand for oxygen, such as during exercise, stress, infection, blood loss and hyperthyroidism. It can also express an effort of the heart to compensate for a reduced stroke volume, as occurs during cardiomyopaty.
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In sinus tachycardia the sinus node fires between 100 and 180 beats per minute, faster than normal. The maximal heart rate decreases with age from around 200 bpm to 140 bpm. The maximal heart rate can be estimated by subtracting the age in years from 210. Sinus tachycardia normally has a gradual start and ending. Most often sinus tachycardia is caused by an increase in the body's demand for oxygen, such as during exercise, stress, infection, blood loss and hyperthyroidism. It can also express an effort of the heart to compensate for a reduced stroke volume, as occurs during cardiomyopathy.
 
{{clr}}
 
{{clr}}
  
The maximal heart rate is considered to be 220/min minus the age (or more precisely 207-0.7xAge <cite>Tanaka</cite><cite>Robergs</cite>). However this is often exceeded during vigorous exercise and has a large inter-individual variation.
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The maximal heart rate is considered to be 220/min minus the age (or more precisely 207-0.7xAge <cite>Tanaka</cite><cite>Robergs</cite>). However, this is often exceeded during vigorous exercise and has a large inter-individual variation.
  
Appropiate sinustachycardia can result from: <cite>Surawicz</cite>
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Appropriate sinus tachycardia can result from: <cite>Surawicz</cite>
* exercise
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* Exercise
* anxiety
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* Anxiety
* alcohol / caffeine use
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* Alcohol / caffeine use
* drugs (e.g. beta-agonists like dobutamine)
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* Drugs (e.g. beta-agonists like dobutamine)
  
The following disease states can result in sinustachycardia:
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Inappropriate sinus tachycardia can result from:
* fever
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* Fever
* hypotension
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* Hypotension
* hypoxia
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* Hypoxia
* congestive heart failure
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* Congestive heart failure
* bleeding
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* Bleeding
* anemia
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* Anemia
* hyperthyroidism
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* Hyperthyroidism
* cardiomyopathy (with reduced left ventricular function and compensatory tachycardia)
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* Cardiomyopathy (with reduced left ventricular function and compensatory tachycardia)
* myocarditis
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* 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.
 
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.

Revision as of 18:13, 27 January 2010

Sinustachycardia
{{{locatieafbeelding}}}
Atrial rate 100-180 bpm
Ventricular rate same
Regularity {{{regularity}}}
Origin sinus node
P-wave positive in II, AVF
Effect of adenosine no (can lead to temporary AV block)
Example ECG:
Example ECG2: {{{example2}}}

Sinus tachycardia is sinus rhythm with a rate of > 100bpm.

Sinus tachycardia is an examples of a supraventricular rhythm. In sinus tachycardia the sinus node fires between 100 and 180 beats per minute, faster than normal. The maximal heart rate decreases with age from around 200 bpm to 140 bpm. The maximal heart rate can be estimated by subtracting the age in years from 210. Sinus tachycardia normally has a gradual start and ending. Most often sinus tachycardia is caused by an increase in the body's demand for oxygen, such as during exercise, stress, infection, blood loss and hyperthyroidism. It can also express an effort of the heart to compensate for a reduced stroke volume, as occurs during cardiomyopathy.

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.

Appropriate sinus tachycardia can result from: [3]

  • Exercise
  • Anxiety
  • Alcohol / caffeine use
  • Drugs (e.g. beta-agonists like dobutamine)

Inappropriate sinus tachycardia can result from:

  • 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]
This is part of: Supraventricular Rhythms