Background: We evaluated the changes of left ventricular function and volumes after the Dor procedure concomitant with total arterial coronary revascularization. Methods: Sixty three patients who underwent the Dor procedure and total arterial revascularization were followed-up for 65 짹 36 months. Echocardiography and single photon emission computed tomography (SPECT) were performed to examine left ventricular function and volumes preoperatively, early postoperatively, and every year thereafter. Coronary angiograms were performed early postoperatively, 1 year and 5 years after surgery. Results: In-hospital mortality was 7.9% (5/63). Late deaths occurred in 11 patients including 6 cardiac deaths. Echocardiograms demonstrated that left ventricular ejection fraction (LVEF) improved significantly at early postoperatively and was maintained until 5 years. Left ventricular end-diastolic and end-systolic volume indices (LVEDVI and LVESVI) decreased significantly early postoperatively and slightly increased at postoperative 1 year; however, the decreased volumes were maintained until 5 years. Myocardial SPECT study showed that improved LVEF at postoperative 3-month was further improved at postoperative 1 year; it was maintained until 5 years. LVESVI and LVEDVI decreased significantly at postoperative 3-month and the decreased volume indices were maintained until 5 years. Postoperative angiograms demonstrated that patency rates of left internal thoracic arteries were 100% (68/68), 98.3% (58/59), and 97.2% (35/36) at early, 1 year and 5 years after surgery, respectively; patency rates of other arterial grafts were 98.8% (80/81), 96.1%(73/76), and 91.1% (41/45) at early, 1 year and 5 years after surgery, respectively Conclusions: Improved LVEF and reduced LVEDVI and LVESVI were maintained until 5 years after the Dor procedure concomitant with total arterial coronary revascularization.