Sinus Tachycardia: Difference between revisions
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{{ | {{Arrhythmias| | ||
| name = Sinustachycardia | |||
| locatieImage = [[Image:Rhythm_tachycardia.png|250px]] | |||
| atrial_frequency = 100-180 bpm | |||
| ventricular_frequency = same | |||
| origin = sinus node | |||
| p_wave = positive in II, AVF | |||
| adenosine = no (can lead to temporary AV block) | |||
| example = | |||
}} | |||
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. | ||
Sinustachycardia 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. | |||
{{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> | ||
{{chapter|Supraventricular Rhythms}} | |||
Revision as of 21:33, 12 January 2010
| {{{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
- Tanaka H, Monahan KD, and Seals DR. Age-predicted maximal heart rate revisited. J Am Coll Cardiol. 2001 Jan;37(1):153-6. DOI:10.1016/s0735-1097(00)01054-8 |
-
Robergs and Landwehr. The Surprising History of the “HRmax=220-age” Equation. Journal of Exercise Physiology
online. 2 May 2002
- ISBN:9780721686974
| This is part of: Supraventricular Rhythms |