Cardiomyopathy changes the heart's shape, making it harder to pump blood. What is Cardiomyopathy? Cardiomyopathy is a progressive disease of the heart muscle (myocardium) that makes it increasingly difficult for the heart to pump blood to the rest of the body. The Result: Because the heart cannot meet the body's demands, this condition frequently leads to chronic Heart Failure and dangerous heart rhythm disturbances. The 3 Main Types [Image comparing Dilated, Hypertrophic, and Restrictive cardiomyopathy] Type What Happens to the Heart? Who is at Risk? Dilated (Most Common) The left ventricle muscle becomes thin and stretched (like an overblown balloon). The heart becomes enlarged and pumps weakly. Middle-aged adults, often due to coronary artery disease or genetic factors. ...