Clinical evaluation of observations in poorly contracting and nondilated left ventricles (nondilated cardiomyopathy)

Idiopathic cardiomyopathy is defined as a heart muscle disease of unknown etiology and classified in 3 categories: dilated, hypertrophic and restrictive cardiomyopathy. 1 We occasionally encounter cases not classifiable in any of these 3 categories. 2–4 Cases with poorly contracting left ventricles without dilatation and hypertrophy are difficult to classify if intracardiac pressure does not have any restrictive feature. This study examines the pathophysiology of patients with poorly contracting and nondilated left ventricle (nondilated cardiomyopathy).