Patients and methods: 61 ASA physical status I or II elderly patients, 32 patients (61 - 87yr, average 68yr) undergoing laparoscopic cholecystectomy and 29 patients (61 - 82yr, average 69yrJ undergoing open cholecystectomy, who underwent elective operation from 2002 Jan to 2002 Aug at Binh Dan hospital were studied.