Of the myocardium and myotonia atrophica (dystrophica myotonia).
D006327:Heart Block / Q000150:complications; D006329:Heart Conduction System / Q000503:physiopathology*; D006801:Humans; D009206:Myocardium / Q000473:pathology*; D009223:Myotonic Dystrophy / Q000503:physiopathology*