Cardiomyopathy

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Arrhythmogenic right ventricular dysplasia (ARVD)
ARVD develops when the muscle tissue in the right ventricle dies and is replaced with scar tissue. This process causes problems in the heart's electrical signaling, resulting in arrhythmias.
Restrictive cardiomyopathy
The ventricles become stiff and rigid due to replacement of the normal heart muscle with abnormal tissue, such as scar tissue. As a result, the ventricles cannot relax normally and expand to fill with blood, which causes the atria to become enlarged.
Types of Cardiomyopathy
Hypertrophic cardiomyopathy
occurs when the heart muscle thickens abnormally.
Dilated cardiomyopathy
affects the heart's ventricles and atria. It usually starts in the left ventricle, where the heart muscle begins to dilate or stretch and become thinner. This leads to enlargement of the inside of the ventricle.
Source: U.S. Department of Health and Human Services, National Institutes of Health, National Heart Lung and Blood Institute. nhlbi.nih.gov
Cardiomyopathy refers to diseases of the heart muscle. These diseases have a variety of causes, symptoms, and treatments. In cardiomyopathy, the heart muscle becomes enlarged or abnormally thick or rigid. In rare cases, the muscle tissue in the heart is replaced with scar tissue.
Nonobstructive
The thickened muscle makes the inside of the left ventricle smaller so that it holds less blood.
Obstructive
The septum thickens and bulges into the left ventricle.
Cardiomyopathy