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Assessment of Exercise Function in Children and Young Adults with Hypertrophic Cardiomyopathy and Correlation with Transthoracic Echocardiographic Parameters

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Abstract

Exercise function is well characterized in adults with hypertrophic cardiomyopathy (HCM); however, there is a paucity of data in children and young adults with HCM. Here we sought to characterize exercise function in young people with HCM, understand limitations in exercise function by correlating exercise function parameters with echocardiogram parameters and identify prognostic value of exercise parameters. We performed a retrospective, single-center cohort study characterizing exercise function in patients < 26 years old with HCM undergoing cardiopulmonary exercise testing (CPET). Patients with syndromic HCM or submaximal effort were excluded. We compared exercise function in this cohort to population normal values and measured changes in exercise function over time. We correlated exercise function parameters with echocardiographic parameters and investigated the relationship between exercise test parameters and a clinical composite outcome comprised of significant ventricular arrhythmia, death, or heart transplantation. We identified 229 CPETs performed by 117 patients (mean age at time of first CPET 15.6 ± 3.2 years). Mean %-predicted peak VO2, O2 pulse, and peak heart rate were statistically significantly depressed compared to population normal values and exercise function gradually worsened over time. Abnormal exercise testing correlated closely with echocardiographic indices of diastolic dysfunction. There was a trend toward increased incidence of poor clinical outcome in patients with abnormal exercise function. While adverse clinical outcomes were rare, normal exercise function appears to be a marker of low risk for adverse clinical outcomes in this population.

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Authors and Affiliations

  1. Department of Cardiology, Boston Children’s Hospital, 300 Longwood Avenue, Boston, MA, 02115, USA

    Robert Przybylski, Ilana R. Fischer, Kimberlee Gauvreau, Mark E. Alexander, Keri M. Shafer, Steven D. Colan & Jonathan Rhodes

  2. Department of Pediatrics, Maria Ferrari Children’s Hospital and New York Medical College, Valhalla, USA, NY, 10595

    Christa Miliaresis

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  1. Robert Przybylski
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Przybylski, R., Fischer, I.R., Gauvreau, K. et al. Assessment of Exercise Function in Children and Young Adults with Hypertrophic Cardiomyopathy and Correlation with Transthoracic Echocardiographic Parameters. Pediatr Cardiol 43, 1037–1045 (2022). https://doi.org/10.1007/s00246-022-02822-2

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