ORIGINAL ARTICLES - Mechanical Circulatory Devices for the Treatment of Heart Failure - The results of a prospective trial of partial left ventriculectomy (PLV) in patients with idiopathic dilated cardiomyopathy, left ventricular end-diastolic diameter (LVEDD) > 7 cm, refractory NYHA Class IV symptoms, and depressed exercise oxygen consumption studies are reported. PLV can be performed with acceptable early and 12-month mortality. Significant improvement in LVEF, LVEDD, and NYHA Class are seen at up to 12-month follow-up