Key result
Spontaneous transition of 2:1 AV block to 1:1 AV conduction occurred in 75% of patients with AV nodal reentrant tachycardia and was associated with significant HV interval prolongation.
Observational (n=20)
In patients with AV nodal reentrant tachycardia, 2:1 AV block is functional and typically occurs within or below the His bundle, with spontaneous transition to 1:1 conduction occurring in 75% of cases.
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Suggests infra-Hisian involvement in AVNRT-related block; leaves open whether HV changes alter ablation strategy or risk assessment.
Lee et al. (2003) conducted an observational in 2:1 AV block during AV nodal reentrant tachycardia (n=20). 2:1 AV block during AV nodal reentrant tachycardia was evaluated on Spontaneous transition of 2:1 AV block to 1:1 AV conduction. Spontaneous transition of 2:1 AV block to 1:1 AV conduction occurred in 75% of patients with AV nodal reentrant tachycardia and was associated with significant HV interval prolongation.
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