What mechanism is AVNRT?

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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

What mechanism is AVNRT?

Explanation:
AVNRT is an intranodal reentrant tachycardia. The AV node contains two pathways—a fast and a slow one—that can form a tiny reentrant circuit entirely within the node. A premature impulse can travel down the slow pathway, then return up the fast pathway, creating continuous looping conduction confined to the AV node. Because the circuit is small and located inside the AV node, the mechanism is described as microreentry. In contrast, macroreentry involves a larger circuit around anatomical structures or through accessory pathways outside the AV node, which AVNRT does not use. That's why the correct concept is micro, not macro.

AVNRT is an intranodal reentrant tachycardia. The AV node contains two pathways—a fast and a slow one—that can form a tiny reentrant circuit entirely within the node. A premature impulse can travel down the slow pathway, then return up the fast pathway, creating continuous looping conduction confined to the AV node. Because the circuit is small and located inside the AV node, the mechanism is described as microreentry. In contrast, macroreentry involves a larger circuit around anatomical structures or through accessory pathways outside the AV node, which AVNRT does not use. That's why the correct concept is micro, not macro.

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