Cardiomyopathy causes significant morbidity and mortality in multiple forms of muscular dystrophy affecting children, including Duchenne muscular dystrophy (DMD), Becker muscular dystrophy (BMD) and subtypes of autosomal recessive limb-girdle muscular dystrophy (LGMD2). Pharmaceutical treatments for the cardiomyopathy of muscular dystrophy, including angiotensin-converting enzyme (ACE) inhibition and beta-adrenergic receptor blockade, afford significant benefit and demonstrate cardiac remodeling in clinical studies. Further studies are needed to identify and characterize more sensitive indicators of cardiac dysfunction in muscular dystrophy subjects to better stratify subjects for entry into clinical protocols.