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Characterization of conduction system activation in the postinfarct ventricle using ripple mapping

Lookup NU author(s): Dr Ruairidh Martin, Dr Moloy Das, Dr Steve Murray

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Abstract

© 2024Background: Three-dimensional (3D) mapping of the ventricular conduction system is challenging. Objective: The purpose of this study was to use ripple mapping to distinguish conduction system activation to that of adjacent myocardium in order to characterize the conduction system in the postinfarct left ventricle (LV). Methods: High-density mapping (PentaRay, CARTO) was performed during normal rhythm in patients undergoing ventricular tachycardia ablation. Ripple maps were viewed from the end of the P wave to QRS onset in 1-ms increments. Clusters of >3 ripple bars were interrogated for the presence of Purkinje potentials, which were tagged on the 3D geometry. Repeating this process allowed conduction system delineation. Results: Maps were reviewed in 24 patients (mean 3112 ± 613 points). There were 150.9 ± 24.5 Purkinje potentials per map, at the left posterior fascicle (LPF) in 22 patients (92%) and at the left anterior fascicle (LAF) in 15 patients (63%). The LAF was shorter (41.4 vs 68.8 mm; P = .0005) and activated for a shorter duration (40.6 vs 64.9 ms; P = .002) than the LPF. Fourteen of 24 patients had left bundle branch block (LBBB), with 11 of 14 (78%) having Purkinje potential–associated breakout. There were fewer breakouts from the conduction system during LBBB (1.8 vs 3.4; 1.6 ± 0.6; P = .039) and an inverse correlation between breakout sites and QRS duration (P = .0035). Conclusion: We applied ripple mapping to present a detailed electroanatomic characterization of the conduction system in the postinfarct LV. Patients with broader QRS had fewer LV breakout sites from the conduction system. However, there was 3D mapping evidence of LV breakout from an intact conduction system in the majority of patients with LBBB.

Publication metadata

Author(s): Katritsis G, Kailey B, Luther V, Jamil Copley S, Koa-Wing M, Balasundram A, Malcolme-Lawes L, Qureshi N, Boon Lim P, Ng FS, Cortez Diaz N, Carpinteiro L, de Sousa J, Martin R, Das M, Murray S, Chow A, Peters NS, Whinnett Z, Linton NWF, Kanagaratnam P

Publication type: Article

Publication status: Published

Journal: Heart Rhythm

Year: 2024

Volume: 21

Issue: 5

Pages: 571-580

Print publication date: 01/05/2024

Online publication date: 26/01/2024

Acceptance date: 02/04/2023

ISSN (print): 1547-5271

ISSN (electronic): 1556-3871

Publisher: Elsevier B.V.

URL: https://doi.org/10.1016/j.hrthm.2024.01.038

DOI: 10.1016/j.hrthm.2024.01.038

PubMed id: 38286246

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