To elucidate the clinical characteristics of patients with right bundle branch block and ST elevation in the right precordial leads, a prospective follow-up study was made in 63 registered patients, including 17 with a history of ventricular fibrillation (VF) and 14 with a history of syncope. The prevalence of coved type ST elevation was significantly higher in patients who had had cardiac events, and during the initial 15-month follow-up, 2 patients in the VF group died suddenly.