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Sinus Tachycardia

981 bytes added, 21:33, 12 January 2010
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{{ChapterArrhythmias|Supraventricular Rhythms| 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 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.
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.
online. 2 May 2002
{{chapter|Supraventricular Rhythms}}

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