etiologies include normal physiologic variance , idiopathic bundle branch fibrosis , calcific valvular heart disease , ischemic heart disease , cardiomyopathies , infections resulting in myocarditis , drugs ( especially type i antidysrhythmic medications ) , collagen vascular diseases , tumors , trauma , electrolyte imbalances , and many other miscellaneous causes .
C0878544
cardiomyopathies
C0027059
myocarditis