QRS duration of idioventricular rhythm (IVR) is typically:

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Multiple Choice

QRS duration of idioventricular rhythm (IVR) is typically:

Explanation:
Idioventricular rhythm is a ventricular escape rhythm, so the impulse starts in the ventricles and spreads through the ventricular muscle via slower, abnormal pathways. That results in a broad QRS complex, typically 0.12 seconds (120 ms) or longer. Therefore, the QRS duration for IVR is best described as 0.12 seconds or greater. Shorter, narrow QRS durations would point to a rhythm using the normal conduction system (not IVR), while a width like 0.15 seconds is consistent with IVR but the standard criterion is 0.12 seconds or greater.

Idioventricular rhythm is a ventricular escape rhythm, so the impulse starts in the ventricles and spreads through the ventricular muscle via slower, abnormal pathways. That results in a broad QRS complex, typically 0.12 seconds (120 ms) or longer. Therefore, the QRS duration for IVR is best described as 0.12 seconds or greater. Shorter, narrow QRS durations would point to a rhythm using the normal conduction system (not IVR), while a width like 0.15 seconds is consistent with IVR but the standard criterion is 0.12 seconds or greater.

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