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

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Prepare for the Electrophysiology Unit (EPU) 26.19 exam with our interactive quiz featuring flashcards and multiple choice questions. Check your understanding with hints and explanations for each question.

Multiple Choice

During AVRT, a HIS-refractory PVC will do what to 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.

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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