Which component is targeted during AVNRT ablation?

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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

Which component is targeted during AVNRT ablation?

Explanation:
AVNRT relies on a reentrant loop that uses two pathways near the AV node: a slow-conducting limb and a fast-conducting limb. In the common slow-fast form, the impulse travels antegrade down the slow pathway and returns retrograde via the fast pathway. Ablation aims to eliminate the slow pathway, disrupting the antegrade limb of the circuit and preventing reentry, which stops the tachycardia. The fast pathway can remain intact to preserve normal AV conduction, and ablation is carefully placed away from the His bundle to avoid complete AV block. The right atrial appendage isn’t part of the reentrant circuit, so it isn’t targeted.

AVNRT relies on a reentrant loop that uses two pathways near the AV node: a slow-conducting limb and a fast-conducting limb. In the common slow-fast form, the impulse travels antegrade down the slow pathway and returns retrograde via the fast pathway. Ablation aims to eliminate the slow pathway, disrupting the antegrade limb of the circuit and preventing reentry, which stops the tachycardia. The fast pathway can remain intact to preserve normal AV conduction, and ablation is carefully placed away from the His bundle to avoid complete AV block. The right atrial appendage isn’t part of the reentrant circuit, so it isn’t targeted.

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