Which pathway tends to repolarize more slowly?

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Study for the Registered Cardiac Electrophysiology Specialist Exam. Engage with interactive flashcards and multiple-choice questions, each with detailed hints and explanations. Prepare to succeed in your examination!

Multiple Choice

Which pathway tends to repolarize more slowly?

Explanation:
In dual AV nodal pathways, the speed of repolarization is tied to how long a pathway remains refractory after activation. The fast pathway has a longer refractory period, so it takes longer to recover excitability and repolarize. The slow pathway, with a shorter refractory period, recovers sooner and repolarizes more quickly. Therefore, the fast pathway tends to repolarize more slowly. This difference helps explain how reentrant circuits can form, since the timing of recovery on each pathway determines which one can conduct again.

In dual AV nodal pathways, the speed of repolarization is tied to how long a pathway remains refractory after activation. The fast pathway has a longer refractory period, so it takes longer to recover excitability and repolarize. The slow pathway, with a shorter refractory period, recovers sooner and repolarizes more quickly. Therefore, the fast pathway tends to repolarize more slowly. This difference helps explain how reentrant circuits can form, since the timing of recovery on each pathway determines which one can conduct again.

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