In a patient with AVNRT, a His-refractory PVC will affect the tachycardia cycle length.

Unlock all questions

This demo includes only 20 questions. Upgrade to access hundreds of questions, flashcards, exam simulations, and disable ads.

Full question bankExam simulationsFlashcards
From $24.99Unlock all

Study for the EPU Electrophysiology Exam with comprehensive questions and explanations. Enhance your knowledge with flashcards and a variety of question formats to ensure you are prepared to excel!

Multiple Choice

In a patient with AVNRT, a His-refractory PVC will affect the tachycardia cycle length.

Explanation:
AVNRT is sustained by a reentrant circuit inside the AV node, with the ventricle not part of the looping pathway. A premature ventricular contraction that arrives when the His bundle is refractory cannot propagate to reset the AV nodal circuit, so it does not alter the timing of the next impulse through the tachycardia. Therefore, the tachycardia cycle length stays the same. Only ventricular events that can engage or reset the reentrant loop (when not His-refractory) might affect TCL.

AVNRT is sustained by a reentrant circuit inside the AV node, with the ventricle not part of the looping pathway. A premature ventricular contraction that arrives when the His bundle is refractory cannot propagate to reset the AV nodal circuit, so it does not alter the timing of the next impulse through the tachycardia. Therefore, the tachycardia cycle length stays the same. Only ventricular events that can engage or reset the reentrant loop (when not His-refractory) might affect TCL.

More Multiple Choice Questions
Subscribe

Get the latest from Examzify

You can unsubscribe at any time. Read our privacy policy