Design: This is a randomized, prospective, interventional, open label study. Upon admission to the NHI, eligible patients were randomly assigned to one of 3 treatment groups; group I (80 mg atorvastatin/day for 2 days preoperatively), group II (40 mg atorvastatin/day for 5-9 days preoperatively) or group III (80 mg atorvastatin/day for 5-9 days preoperatively). Atorvastatin doses were reinitiated postoperatively as soon as patients could take the medication orally and was continued for one month after operation.