Electrophysiology Unit (EPU) 26.19 Practice Test

During AVRT, a HIS-refractory PVC will do what to the arrhythmia?

Break the arrhythmia Prolong AVN conduction Accelerate AVRT Have no effect

Correct Answer:

Break the arrhythmia

Explanation:

AVRT is a reentrant circuit that depends on conduction through the ventricles, the AV node, and an accessory pathway to keep looping. If a ventricular premature beat occurs while the His-Purkinje system is refractory, that impulse cannot travel up through the AV node or participate in the reentrant loop. This disruption breaks the circuit and terminates the tachycardia. So a His-refractory PVC can stop AVRT rather than prolong conduction, accelerate the tachycardia, or have no effect.

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