Objective To investigate the effects of volume expansion before inductionofanaesthesia on postoperative nausea and vomiting(PONV) in patients undergoing laparoscopic operations.
目的研究麻醉诱导前扩容对腹腔镜手术后恶心呕吐（PONV）发生率的影响。
2
Objective To observe the changes of auditory evoked potentials index(AEPI)during induction and tracheal intubation and evaluate its effectiveness on anaesthesia depth monitoring.