Difference between revisions of "Sinus Tachycardia"

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{{Chapter|Supraventricular Rhythms}}
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{{Arrhythmias|
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| name = Sinustachycardia
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| locatieImage = [[Image:Rhythm_tachycardia.png|250px]]
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| atrial_frequency = 100-180 bpm
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| ventricular_frequency = same
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| origin = sinus node
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| p_wave = positive in II, AVF
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| adenosine = no (can lead to temporary AV block)
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| example =
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}}
 
Sinustachycardia is [[Sinus_node_rhythms_and_arrhythmias|sinus rhythm]] with a rate of > 100bpm.  
 
Sinustachycardia is [[Sinus_node_rhythms_and_arrhythmias|sinus rhythm]] with a rate of > 100bpm.  
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Sinustachycardia is an examples of a [[Supraventricular Rhythms|supraventricular rhythm]].
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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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{{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.
 
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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online. 2 May 2002
 
online. 2 May 2002
 
</biblio>
 
</biblio>
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{{chapter|Supraventricular Rhythms}}

Revision as of 21:33, 12 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}}}

Sinustachycardia is sinus rhythm with a rate of > 100bpm.

Sinustachycardia is an examples of a 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.

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]
This is part of: Supraventricular Rhythms