Enlarged heart. Dilated cardiomyopathy is description of an enlarged, poorly contracting heart. It can be due to known factors such as ischemia (coronary), infectiion (virus) drugs (cancer)etc or unknown (idiopathic) which is genetic or familial. The latter is transmitted as autosomal dominant 50% chance of getting it or X linked- mother are carriers but sons get the disease plus muscular dystrophy.
Heart muscle. That is not functioning normally with resultant chamber enlargement. Diagnosed by echocardiogram.