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Patients with cardiomyopathy, a stiffening and thickening of the heart muscle that weakens it, may develop an enlarged heart as it labors to pump an adequate supply of blood to the body. Coronary artery disease, in which plaque in the arteries interferes with the flow of blood, can cause the heart to enlarge.
In the other types of cardiomegaly, the heart's large muscular left ventricle becomes abnormally thick. Hypertrophy is usually what causes left ventricular enlargement. Hypertrophic cardiomyopathy is typically an inherited condition. There are many techniques and tests used to diagnose an enlarged heart.