Why the study?
Macroreentrant VT with an intraseptal substrate exhibits centrifugal spread, making it challenging to delineate the circuit, necessitating alternative catheter ablation strategies such as targeting the entrance of the slow conduction zone.
Does catheter ablation targeting the entrance of the slow conduction zone provide a successful alternative method for intraseptal ventricular tachycardia ablation?
Does catheter ablation targeting the entrance of the slow conduction zone provide a successful alternative method for intraseptal ventricular tachycardia ablation?
Targeting the entrance of the slow conduction zone is a viable alternative strategy for catheter ablation of intraseptal ventricular tachycardia, particularly when exit ablation fails.
Entrance targeting may succeed after exit failure in intraseptal VT; leaves open need for prospective validation.
Key Teaching Points•Macroreentrant ventricular tachycardia (VT) with an intraseptal substrate exhibits a centrifugal spread, making it challenging to complete the delineation of the circuit.•The localization of the slow conduction zone (SCZ) in the intraseptum would be more convincingly elucidated when the “entrance” and “exit” can be identified on the ventricular septum.•Manifest entrainment and orthodromic capture of the earliest activation site indicate that the pacing site is proximal to the SCZ. When pacing from a limited area exhibits those findings, the pacing site would be located on the entrance side of the SCZ.•Catheter ablation strategy targeting the entrance of the SCZ is an alternative method of intraseptal VT ablation, especially in cases with exit ablation failure. •Macroreentrant ventricular tachycardia (VT) with an intraseptal substrate exhibits a centrifugal spread, making it challenging to complete the delineation of the circuit.•The localization of the slow conduction zone (SCZ) in the intraseptum would be more convincingly elucidated when the “entrance” and “exit” can be identified on the ventricular septum.•Manifest entrainment and orthodromic capture of the earliest activation site indicate that the pacing site is proximal to the SCZ. When pacing from a limited area exhibits those findings, the pacing site would be located on the entrance side of the SCZ.•Catheter ablation strategy targeting the entrance of the SCZ is an alternative method of intraseptal VT ablation, especially in cases with exit ablation failure.
No takes yet. Share an insight, caveat, or question.
Okada et al. (2023) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: