Accelerated idioventricular rhythm | |
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Accelerated idioventricular rhythm (AIVR) at a rate of 55/min presumably originating from the left ventricle (LV). Note the typical QRS morphology in lead V1 characteristic of ventricular ectopy from the LV. Monophasic R-wave with smooth upstroke and notching on the downstroke (i.e., the so-called taller left peak or "rabbit-ear".) | |
Specialty | Cardiology ![]() |
Accelerated idioventricular rhythm is a ventricular rhythm with a rate of between 40 and 120 beats per minute. Idioventricular means “relating to or affecting the cardiac ventricle alone” and refers to any ectopic ventricular arrhythmia.[1] Accelerated idioventricular arrhythmias are distinguished from ventricular rhythms with rates less than 40 (ventricular escape) and those faster than 120 (ventricular tachycardia).[2] Though some other references limit to between 60 and 100 beats per minute.[3] It is also referred to as AIVR and "slow ventricular tachycardia."
It can be present at birth.[4] However, it is more commonly associated with reperfusion after myocardial injury.[2] AIVR is generally considered to be a benign abnormal heart rhythm. It is typically temporary and does not require treatment.