Mitral regurgitation in congestive cardiomyopathy

CARDIOMYOPATHIES have been defined as 'A sub- acute or chronic disorder of heart muscle of unknown or obscure aetiology often with asso- ciated endocardial or pericardial involvement but not due to occlusive coronary atherosclerosis' (Goodwin et al., 1961; Goodwin, 1966).