When the patient was optimally sedated (Ramsay scale 2-5 scores), the corresponding median BIS 95% confident interval (CI) were 61-84.

• 原发病：急性化脓性胆管炎11例，多发性外伤4例，消化道肿瘤7例，脊柱侧弯4例，泌尿系统肿瘤4例。