During AV Wenckebach the PR interval prolongs before a dropped ventricular beat.

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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

During AV Wenckebach the PR interval prolongs before a dropped ventricular beat.

Explanation:
AV Wenckebach, or Mobitz type I, involves decremental conduction at the AV node. With each heartbeat the PR interval gets longer until an atrial impulse isn’t conducted and a ventricular beat is dropped. After that dropped beat, the PR interval resets and the cycle repeats. This progressive PR prolongation before a dropped beat is the hallmark of this block, so the statement is true. The pattern contrasts with Mobitz II, where the PR interval before a drop is constant, and with complete heart block, where there’s no consistent relationship between atrial and ventricular activity.

AV Wenckebach, or Mobitz type I, involves decremental conduction at the AV node. With each heartbeat the PR interval gets longer until an atrial impulse isn’t conducted and a ventricular beat is dropped. After that dropped beat, the PR interval resets and the cycle repeats. This progressive PR prolongation before a dropped beat is the hallmark of this block, so the statement is true. The pattern contrasts with Mobitz II, where the PR interval before a drop is constant, and with complete heart block, where there’s no consistent relationship between atrial and ventricular activity.

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