IVR?: Do you have that right? It's usually abbreviated "AIVR" and stands for "accelerated idioventricular rhythm." The ventricles have an intrinsic rhythm of about 30-35 that is normally suppressed by supraventricular conduction. If there is AV dissociation, the ventricles can beat at their own rate or IVR. More often, the rate is about a 100 so it's called an "accelerated idioventricular rhythm."
Answered 7/24/2014
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