DMD and hyperinsulinemic hypoglycemia, familial, 4: Life-threatening consequences of cardiac muscle dystrophin deficiency include dilated cardiomyopathy, arrhythmias, and congestive heart failure (Kamdar and Garry, 2016; McNally and Wyatt, 2017; Buddhe et al., 2019; Meyers and Townsend, 2019).