Cardiac Biomarkers in Pediatric Cardiomyopathy (PCM Biomarkers)

Pediatric cardiomyopathy is a heterogeneous disease with high morbidity and mortality in which children often present with fulminant disease leading to death or transplant. Highly sensitive and specific cardiac biomarkers or panels of biomarkers, representing different pathologic mechanisms or pathways, are the least invasive (a particularly important consideration in children) and most-cost-effective approach to the early detection of cardiac dysfunction. The long-term goal of this project is to identify such biomarkers in children with cardiomyopathy. These findings could represent a major advance in determining the most appropriate evidence-based clinical care for these children, including when to consider heart transplantation. The specific aims of this study are: 1. To determine the ability of established and novel cardiac biomarkers to predict short- and long-term outcomes in children with newly diagnosed (incident) dilated cardiomyopathy (DCM) 2. To assess the clinical utility of cardiac biomarkers of collagen metabolism in determining the presence of myocardial fibrosis, as established by cardiac MRI (cMRI), and left ventricular (LV) diastolic dysfunction, as established by echocardiography in both newly diagnosed and existing cases of idiopathic and familial hypertrophic cardiomyopathy (HCM) in children. 3. To determine whether longitudinal changes in cardiac biomarkers are associated with worsening heart failure (HF) class in clinically stable children with dilated or hypertrophic cardiomyopathy. This study will determine the importance of serological biomarkers, in conjunction with cardiac imaging, in the early identification of heart disease before cardiac remodeling and functional impairment have become irreversible in a pediatric population. This is a 5-year prospective study of up to 480 children with either primary dilated or hypertrophic cardiomyopathy. The study will have three components: 1) clinical data collection by chart review, 2) biospecimen collection and testing, and 3) centralized review and measurement of echocardiograms and cMRIs.