A group of diseases that affect the myocardium (muscle of the heart).
There are three basic types of cardiomyopathy, which are distinguished by the kind of muscle problem involved:
Dilated cardiomyopathy, in which the heart muscle becomes weak and the heart chambers subsequently dilate.
Hypertrophic cardiomyopathy, in which the heart muscle itself is much thicker than normal.
Restrictive cardiomyopathy, in which the heart becomes stiff and cannot fill efficiently during diastole, the period of the...