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. 2022 Aug 30;80(9):902-914.
doi: 10.1016/j.jacc.2022.05.053.

Impact and Modifiers of Ventricular Pacing in Patients With Single Ventricle Circulation

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Free article

Impact and Modifiers of Ventricular Pacing in Patients With Single Ventricle Circulation

Henry Chubb et al. J Am Coll Cardiol. .
Free article

Abstract

Background: Palliation of the single ventricle (SV) circulation is associated with a burden of lifelong complications. Previous studies have identified that the need for a permanent ventricular pacing system (PPMv) may be associated with additional adverse long-term outcomes.

Objectives: The goal of this study was to quantify the attributable risk of PPMv in patients with SV, and to identify modifiable risk factors.

Methods: This international study was sponsored by the Pediatric and Congenital Electrophysiology Society. Centers contributed baseline and longitudinal data for functionally SV patients with PPMv. Enrollment was at implantation. Controls were matched 1:1 to PPMv subjects by ventricular morphology and sex, identified within center, and enrolled at matched age. Primary outcome was transplantation or death.

Results: In total, 236 PPMv subjects and 213 matched controls were identified (22 centers, 9 countries). Median age at enrollment was 5.3 years (quartiles: 1.5-13.2 years), follow-up 6.9 years (3.4-11.6 years). Median percent ventricular pacing (Vp) was 90.8% (25th-75th percentile: 4.3%-100%) in the PPMv cohort. Across 213 matched pairs, multivariable HR for death/transplant associated with PPMv was 3.8 (95% CI 1.9-7.6; P < 0.001). Within the PPMv population, higher Vp (HR: 1.009 per %; P = 0.009), higher QRS z-score (HR: 1.19; P = 0.009) and nonapical lead position (HR: 2.17; P = 0.042) were all associated with death/transplantation.

Conclusions: PPMv in patients with SV is associated with increased risk of heart transplantation and death, despite controlling for increased associated morbidity of the PPMv cohort. Increased Vp, higher QRS z-score, and nonapical ventricular lead position are all associated with higher risk of adverse outcome and may be modifiable risk factors.

Keywords: Fontan; Glenn; cardiac resynchronization therapy; cardiac transplant; congenital heart disease; electrical dyssynchrony; heart failure; pediatric; single ventricle.

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Conflict of interest statement

Funding Support and Author Disclosures Drs Janousek and Fumanelli were supported by the Ministry of Health, Czech Republic: conceptual development of research organization, Motol University Hospital, Prague, Czech Republic. Dr Balaji has been a medical advisor/consultant to “yoR labs” (stock options). All other authors have reported that they have no relationships relevant to the contents of this paper to disclose.

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