Cardiomyopathy may be seen in all except-
Duchenne muscular dystrophy
Friedreich's ataxia
Type II glycogen storage
Alkaptonuria
Etiological classification of cardiomyopathy:
A. Primary myocardial involvement

Idiopathic (D, R, H)
Familial (D, R, H)
Eosinophilic endomyocardial disease (R)
Endomyocardial fibrosis (R)

B) Secondary myocardial involvement