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Cardiomyopathies are diseases of the myocardium
associated with cardiac dysfunction
There are five types of cardiomyopathy: dilated,
hypertrophic, restrictive, arrhythmogenic right
ventricular, and unclassified cardiomyopathy. Many
conditions present as one form of cardiomyopathy and
progress to another. For example, hypertensive heart
disease may begin with a hypertrophic pattern and
subsequently become a dilated cardiomyopathy. Some
diseases may have features of more than one type of
cardiomyopathy, eg, sarcoidosis may have features of
restrictive and dilated cardiomyopathy at different
times in the course of the disease.
Cardiomyopathy frequently results in the heart
failure syndrome, with multiple systemic
manifestations. On the other hand, many systemic
conditions have cardiac involvement and may present
primarily as heart failure.
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