Results of open-heart surgery in high-risk patients.

Of 732 patients undergoing open heart surgery in Pars Hospital Tehran, 127 were classified in a high risk surgical category. Of these, there were 19 mortalities. Three main groups of patients were studied; Group I consisted of those with congenital disorders, such as Ebstein's anomaly and the medical-necrosis type of ascending aneurysms; Group II consisted of reoperation cases; and Group III was composed of patients with cardiomegaly who required double or triple-valve surgery.