In AVRT, which pathway shows HIS earliest activation?

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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

In AVRT, which pathway shows HIS earliest activation?

Explanation:
During AVRT, the timing of His bundle activation tracks how close the accessory pathway is to the AV node/His system. Septal pathways lie on the interventricular septum right near the AV node and His bundle, so the retrograde impulse traveling through the accessory pathway reaches the atrium in proximity to the His region and makes the His bundle activate earliest. Lateral and posterior pathways are farther from the His bundle, leading to later activation timings. So the pathway that shows the earliest His activation is the septal one.

During AVRT, the timing of His bundle activation tracks how close the accessory pathway is to the AV node/His system. Septal pathways lie on the interventricular septum right near the AV node and His bundle, so the retrograde impulse traveling through the accessory pathway reaches the atrium in proximity to the His region and makes the His bundle activate earliest. Lateral and posterior pathways are farther from the His bundle, leading to later activation timings. So the pathway that shows the earliest His activation is the septal one.

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