TNNT2 and Arrhythmia: Using myocardial biopsy, TTE or cMRI including LGE, and inclusion of other cardiac manifestations of skeletal muscle dystrophies such as arrhythmias or conduction abnormalities and diastolic dysfunction resulted in the highest clinical specificities for hs‐cTnT (100%, 95% confidence interval [CI] = 3–100) and hs‐cTnI (100%, 95% CI = 3–100; Figures 4 and 5).