Last updated: January 26, 2023
Cardiomyopathies are diseases of the muscle tissue of the heart. Types of cardiomyopathies include dilated (most common), hypertrophic, restrictive, and arrhythmogenic right ventricular cardiomyopathy.
Arrhythmogenic right ventricular cardiomyopathy (ARVC) primarily affects the right ventricle and is characterized by fibrofatty replacement of myocardium, which causes myocardial thinning and subsequent ventricular dilation. Although the hallmark finding is arrhythmia, symptoms are highly variable. Because management depends greatly on individual factors, such as the extent of the disease, there is no single best course of treatment. All patients should avoid strenuous exercise.
Arrhythmia-induced cardiomyopathy is a very rare type of cardiomyopathy. It is caused by long-standing arrhythmia and typically affects the left ventricle. Features include palpitations, syncope, and signs of arrhythmia on ECG. Progression to left heart failure is possible in severe cases. Treatment involves antiarrhythmics such as beta blockers for rhythmic control.
“Dilated cardiomyopathy”, “Hypertrophic cardiomyopathy,” “Restrictive cardiomyopathy,” and “Peripartum cardiomyopathy” are described in their respective articles in more detail.
Overview of major types of cardiomyopathy
Arrhythmogenic right ventricular cardiomyopathy (ARVC)
Left ventricular noncompaction 
Definition: rare inherited cardiomyopathy which is associated with structural abnormalities of the left ventricular myocardium (prominent trabeculations and deep intertrabecular recesses)
Diagnostics: echocardiography and/or cardiac MRI: LV wall thickening, prominent trabecular meshwork, detection of abnormal flow (within the deep intertrabecular recesses)
Treatment: no causal treatment available
Arrhythmia-induced cardiomyopathy 
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