ⓘ Idioventricular rhythm. Normally, the pacemaker of the heart that is responsible for triggering each heart beat is the SA node. However, if the ventricle does n ..

                                     

ⓘ Idioventricular rhythm

Normally, the pacemaker of the heart that is responsible for triggering each heart beat is the SA node. However, if the ventricle does not receive triggering signals at a rate high enough from either the SA node or the AV node, the ventricular myocardium itself becomes the pacemaker. This is called Idioventricular Rhythm. Ventricular signals are transmitted cell-to-cell between cardiomyocytes and not by the conduction system, creating wide sometimes bizarre QRS complexes. The rate is usually 20-40 bpm. If the rate is > 40 bpm, it is called accelerated idioventricular rhythm. The rate of 20-40 is the "intrinsic automaticity" of the ventricular myocardium. It can be regarded as a physiological redundancy of the cardiac electrical system.

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