Arrhythmias & electrophysiology
The Value of Functional Fascicular Block in Patients With Atrioventricular Re-Entrant Tachycardia
Authors' conclusion
In patients with AVRT, ΔVAI during complete BBB enables more robust AP localization compared with incomplete BBB. Moreover, ΔVAI during FB allows for AP localization along the mitral annulus, especially LAFB for left lateral APs and LPFB for posterior-septal and left posterior APs.
Study context
- Population
- Patients with AVRT and single non-decremental accessory pathway (APs) (left free wall, septal, right free wall) displaying functional fascicular block (FB) or bundle branch block (BBB) during AVRT
- Participants
- 419 single non-decremental APs
- Exposure
- ΔVAI during functional FB vs BBB by AP location
- Left free walln = 207
- Septaln = 159
- Right free walln = 53
- Outcome
- Change in ventriculoatrial interval (ΔVAI) by AP location
Main finding
As reported in the abstract
ΔVAI by AP location
- Left and right free wall APs: ΔVAI increased with ipsilateral BBB
- Complete BBB distinguished AP location better than incomplete BBB
- LAFB: ΔVAI prolongation with left lateral and posterior-lateral APs; no ΔVAI with left posterior and posterior-septal APs
- LPFB: marked ΔVAI lengthening with left posterior, posterior-lateral and posterior-septal APs; no ΔVAI with left lateral APs
Observational data: associations, not effects.
Original publication
The Value of Functional Fascicular Block in Patients With Atrioventricular Re-Entrant Tachycardia. JACC Clin Electrophysiol. Published 6 August 2025. doi:10.
Composed by AI from the published abstract and checked against it. How Briefs are made →