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Lookup NU author(s): Dr Zdenka Reinhardt
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License (CC BY-NC 4.0).
BACKGROUND: Maximal left ventricular wall thickness (MLVWT) is a risk factor for sudden cardiac death (SCD) in hypertrophic cardiomyopathy (HCM). In adults, the severity of left ventricular hypertrophy has a nonlinear relationship with SCD, but it is not known whether the same complex relationship is seen in childhood. The aim of this study was to describe the relationship between left ventricular hypertrophy and SCD risk in a large international pediatric HCM cohort. METHODS: The study cohort comprised 1075 children (mean age, 10.2 years [±4.4]) diagnosed with HCM (1-16 years) from the International Paediatric Hypertrophic Cardiomyopathy Consortium. Anonymized, noninvasive clinical data were collected from baseline evaluation and follow-up, and 5-year estimated SCD risk was calculated (HCM Risk-Kids). RESULTS: MLVWT Z score was <10 in 598 (58.1%), ≥10 to <20 in 334 (31.1%), and ≥20 in 143 (13.3%). Higher MLVWT Z scores were associated with heart failure symptoms, unexplained syncope, left ventricular outflow tract obstruction, left atrial dilatation, and nonsustained ventricular tachycardia. One hundred twenty-two patients (71.3%) with MLVWT Z score ≥20 had coexisting risk factors for SCD. Over a median follow-up of 4.9 years (interquartile range, 2.3-9.3), 115 (10.7%) had an SCD event. Freedom from SCD event at 5 years for those with MLVWT Z scores <10, ≥10 to <20, and ≥20 was 95.6%, 87.4%, and 86.0, respectively. The estimated SCD risk at 5 years had a nonlinear, inverted U-shaped relationship with MLVWT Z score, peaking at Z score +23. The presence of coexisting risk factors had a summative effect on risk. CONCLUSIONS: In children with HCM, an inverted U-shaped relationship exists between left ventricular hypertrophy and estimated SCD risk. The presence of additional risk factors has a summative effect on risk. While MLVWT is important for risk stratification, it should not be used either as a binary variable or in isolation to guide implantable cardioverter defibrillator implantation decisions in children with HCM.
Author(s): Norrish G, Ding T, Field E, Cervi E, Ziolkowska L, Olivotto I, Khraiche D, Limongelli G, Anastasakis A, Weintraub R, Biagini E, Ragni L, Prendiville T, Duignan S, McLeod K, Ilina M, Fernandez A, Marrone C, Bokenkamp R, Baban A, Kubus P, Daubeney PEF, Sarquella-Brugada G, Cesar S, Klaassen S, Ojala TH, Bhole V, Medrano C, Uzun O, Brown E, Gran F, Sinagra G, Castro FJ, Stuart G, Vignati G, Yamazawa H, Barriales-Villa R, Garcia-Guereta L, Adwani S, Linter K, Bharucha T, Garcia-Pavia P, Siles A, Rasmussen TB, Calcagnino M, Jones CB, De Wilde H, Kubo T, Felice T, Popoiu A, Mogensen J, Mathur S, Centeno F, Reinhardt Z, Schouvey S, O'Mahony C, Omar RZ, Elliott PM, Kaski JP
Publication type: Article
Publication status: Published
Journal: Circulation. Arrhythmia and electrophysiology
Year: 2022
Volume: 15
Issue: 5
Online publication date: 02/05/2022
Acceptance date: 23/02/2022
Date deposited: 09/06/2022
ISSN (print): 1941-3149
ISSN (electronic): 1941-3084
Publisher: Lippincott Williams & Wilkins
URL: https://doi.org/10.1161/CIRCEP.121.010075
DOI: 10.1161/CIRCEP.121.010075
PubMed id: 35491873
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