Age-Related Ventricular Tachycardia Substrate Characteristics for Repaired Tetralogy of Fallot Before Transcatheter Pulmonary Valve Placement.
Document Type
Article
Publication Date
3-2025
Identifier
DOI: 10.1016/j.jacep.2024.11.005
Abstract
Background: Ventricular tachycardia (VT) substrate characteristics before transcatheter pulmonary valve replacement (TPVR) in repaired tetralogy of Fallot (rTOF) are unknown.
Objectives: In this study, the authors sought to evaluate substrates for sustained monomorphic VT before TPVR in rTOF.
Methods: Retrospective (2017 to 2021) and prospective (commencing 2021) rTOF patients with native right ventricular outflow tract referred for electrophysiology study (EPS) before TPVR were included. Electrophysiologic findings and outcomes of VT ablation were determined.
Results: A total of 180 patients (mean age 39 ± 14 years, 54% male, 71 retrospective, 109 prospective) were identified. At EPS, monomorphic VT was induced in 45 (25%), and a slowly conducting anatomic isthmus alone was observed in 40 (22%). VT isthmus conduction velocity decreased (-0.08 m/s per decade; P = 0.008) and VT inducibility (P < 0.001 for trend) and cycle length (CL) (+15 ms per decade, P = 0.005) increased with age. Multivariable factors associated with shorter VT CL included preserved isthmus conduction velocity (-50 ms per m/s; P = 0.02), absence of atrial flutter (-18 ms; P = 0.007), and improved RV ejection fraction (-16 ms per 10% increase; P = 0.007). Catheter ablation was acutely successful in 80/83 (96%). At repeated EPS after a median of 5 months, previously ablated substrates were evident in 3/24 (13%) and new VT substrates in 3/33 (9%).
Conclusions: Pre-TPVR VT substrates in rTOF demonstrate age-related degeneration that was associated with VT inducibility and VT CL. Both recovery of VT isthmus conduction and new VT substrates were observed after TPVR despite successful catheter ablation.
Journal Title
JACC Clin Electrophysiol
Volume
11
Issue
3
First Page
551
Last Page
562
MeSH Keywords
Humans; Tetralogy of Fallot; Male; Female; Tachycardia, Ventricular; Adult; Retrospective Studies; Catheter Ablation; Middle Aged; Pulmonary Valve; Prospective Studies; Heart Valve Prosthesis Implantation; Electrophysiologic Techniques, Cardiac; Age Factors; Young Adult
PubMed ID
39818670
Keywords
catheter ablation; electrophysiology study; tetralogy of Fallot; transcatheter pulmonary valve; ventricular tachycardia
Recommended Citation
Moore JP, Waldmann V, Bessière F, et al. Age-Related Ventricular Tachycardia Substrate Characteristics for Repaired Tetralogy of Fallot Before Transcatheter Pulmonary Valve Placement. JACC Clin Electrophysiol. 2025;11(3):551-562. doi:10.1016/j.jacep.2024.11.005
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