QRS complexes that measure 0.12 seconds or greater and a heart rate between 20 and 40 bpm indicate that the impulses causing ventricular depolarization are coming from which location?

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QRS complexes that measure 0.12 seconds or greater and a heart rate between 20 and 40 bpm indicate a slow ventricular depolarization, which is consistent with impulses coming from the Purkinje fibers. The AV node and SA node typically have faster rates of impulse conduction, and interatrial pathways are not involved in ventricular depolarization.

QRS Complexes That Measure 0