What is the heart rate for idioventricular rhythm (IVR)?

Idioventricular rhythm (IVR) is characterized by a heart rate that typically falls within the range of 20 to 40 beats per minute. This rhythm occurs when the primary pacemaker of the heart shifts from the sinoatrial node or atrioventricular node to the ventricles, often as a result of failure in the higher pacemakers. The slower rate is reflective of the inherent pacing ability of the ventricular myocardium, which is much slower than that of the atrial pacemakers.

In cases where IVR is present, the heart is not generating enough rate to sustain effective circulation, which can lead to symptoms such as hypotension or altered mental status in the patient. Understanding this range is critical for recognizing the rhythm and facilitating appropriate management, particularly in critical care settings where timely interventions can be lifesaving.