Effect of Bispectral Index Monitoring (BIS) on Body Movement of Outpatients Undergoing Gastroscopy

Patients who meet the enrollment criteria were randomized 1:1 to either the BIS group or the OAA/S group. In the BIS group, the anesthesiologist set the target controlled infusion（TCI）parameters according to the patient's height, weight, gender and age. The initial plasma target concentration was set to 1.5 ug/ml, and the target concentration would be increased or decreased 0.5 ug/ml every two minutes to maintain the BIS value at 45-60. In the OAA/S group, the target concentration would be increased or decreased 0.5 ug/ml every two minutes to maintain the OAA/S value at 1 point.