- Accelerated idioventricular rhythm
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MeshID = D016170
The rate of cardiac contraction is determined by the intrinsic rate of depolarisation of the cardiac cells. In normal hearts the
sinoatrial nodein the atria depolarises at a rate of 70 beats per minute. This suppresses the intrinsic depolarisation of the other parts of the heart.
The accelerated idioventricular rhythm occurs when depolarisation rate of a normally suppressed focus increases to above that of the "higher order" focuses (the sinoatrial node and the
atrioventricular node). This most commonly occurs in the setting of a sinus bradycardia. [http://www.emedicine.com/med/topic12.htm]
AIVR appears similar to
ventricular tachycardiabut is benign and doesn't need any treatment. It can most easily be distinguished from VT in that the rate is less than 120 and usually less than 100 bpm.
:1. http://www.emedicine.com/med/topic12.htm:2. Hampton, John (1997). The ECG Made Easy.
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