Table 1: World Health Organization Classification of Cardiomyopathies

Table 1:
World Health Organization Classification of Cardiomyopathies
Cardiomyopathy	Definition	Sample Etiologies
Dilated	Dilated left/both ventricle(s) with impaired contraction	Ischemic, idiopathic, familial/genetic, immune, alcoholic, toxic, valvular
Hypertrophic	Left and/or right ventricular hypertrophy	Familial with autosomal dominant inheritance (see chapter on Hypertrophic Cardiomyopathy)
Restrictive	Restrictive filling and reduced diastolic filling of one/both ventricles. Normal/near normal systolic function	Idiopathic, amyloidosis, endomyocardial fibrosis
Arrhythmogenic right ventricular cardiomyopathy	Fibro-fatty replacement of right ventricular myocardium,Uhl's anomaly ("parchment heart")	Unknown. Familial, usually autosomal dominant inheritance, with incomplete penetrance. Autosomal recessive inheritance may also occur. Rare forms associated with typical phenotype, eg, Naxos disease.
Unclassified	Not typical for previous 4 groups	Fibroelastosis, noncompacted myocardium, systolic dysfunction with minimal dilatation, mitochondrial diseases
Adapted from reference 1.