Surgical correction of hypertrophic obstructive cardiomyopathy: seventeen-year Green Lane experience.

Between 1977 and 1994, 42 patients were treated surgically for hypertrophic obstructive cardiomyopathy (HOCM). Patients have been followed up between 2 months to 17 years, mean of 107 months. There were 26 (62%) males and 16 (38%) females. There was only one pediatric case. There was no correlating factor among the ethnic groups (Maori, European, Indian, Asian, etc.). Family history was noted in 12% of the cases. Seventy-one percent of patients had aortic/left ventricular (LV) combined approach while 29% had aortic approach alone at the time of surgery. Five patients underwent other procedures, along with coronary artery bypass grafting in 3, mitral valve replacement in 1, and aortic valve replacement in 1. Persistent postoperative arrhythmias were found in 7 cases, atrial fibrillation (AF) in 3, and left bundle branch block in 4.