Hypertrophic Obstructive Cardiomyopathy Initial Results and Long-term Follow-up After

Background This study was performed to assess the initial results and long-term follow-up of Morrow septal myectomy for patients with hypertrophic obstructive cardiomyopathy (HOCM). Methods and Results We studied 38 consecutive patients with HOCM (age, 13 to 74 years) who underwent a Morrow septal myectomy between 1977 and 1992. There were no perioperative deaths, and the postoperative course was un-eventful for all except 2 of the patients. One patient required implantation of a pacemaker due to a complete heart block, and in 1 patient a small ventricular septal defect was caused. Follow-up (mean, 6.8 years) was 100 % complete. No patient was reoperated for recurrent HOCM. All except 1 patient experienced a major functional improvement with a decrease of the mean New York Heart Association functional class from 3.0 before operation to 1.5 at follow-up (P<.001). Symptoms persisting during follow-up were angina pectoris in 3 of 22 patients (14%), dyspnea in 6 of 30 patients (20%), dizzy spell