Local reentry within the AV node causes which arrhythmia?

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Multiple Choice

Local reentry within the AV node causes which arrhythmia?

Explanation:
Local reentry within the AV node drives a fast, regular heart rhythm that stays supraventricular in origin. When the reentrant circuit is confined to the AV node, the ventricles are activated through the normal conduction system, producing a narrow-complex tachycardia. This pattern falls under the category of supraventricular tachycardia, specifically AV nodal reentrant tachycardia (AVNRT). Why the others don’t fit: atrial fibrillation is an irregular, disorganized atrial rhythm with variable AV conduction, not a single AV-node–based reentrant circuit. Ventricular tachycardia originates below the AV node in the ventricles. nodal bradycardia is a slow rhythm due to reduced nodal automaticity or conduction, not a rapid reentrant SVT.

Local reentry within the AV node drives a fast, regular heart rhythm that stays supraventricular in origin. When the reentrant circuit is confined to the AV node, the ventricles are activated through the normal conduction system, producing a narrow-complex tachycardia. This pattern falls under the category of supraventricular tachycardia, specifically AV nodal reentrant tachycardia (AVNRT).

Why the others don’t fit: atrial fibrillation is an irregular, disorganized atrial rhythm with variable AV conduction, not a single AV-node–based reentrant circuit. Ventricular tachycardia originates below the AV node in the ventricles. nodal bradycardia is a slow rhythm due to reduced nodal automaticity or conduction, not a rapid reentrant SVT.

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