Opioid Based Anaesthesia vs Opioid Free Anesthesia in Cleft Lip, Palate ,Alveolus Surgery.

Peri-operative opioid administration has long been one of the three pillars of 'balanced anaesthesia',over the span of just a few years,opioids were widely used in perioperative analgesia because of pain as the fifth vital sign.However, opioid administration is not without concern and is associated with many side-effects such as constipation, urinary retention, respiratory depression and postoperative nausea and vomiting .Cleft lip,palate,alveolus are common craniofacial abnormalities and usually require surgical repair.These patients have risks for various perioperative complications due to their young age and craniofacial abnormalities. This study was designed to compare the effects of opioid based anesthesia（OBA） and opioid free anesthesia(OFA )on perioperative complications in patients with in cleft lip,palate,alveolus surgery, including respiratory depression, postoperative nausea and vomiting, hemodynamic effects, etc.

Patients in OBA ,anesthesia induction will receive fentanyl 2ug/kg ,propofol 1% 2-3mg/kg, rocuronium 0.6-1mg/kg. Anesthesia maintenance with 1.5-2% sevoflurane, propofol 1% 3-6mg/kg/hr , remifentanil of 0.1- 0.2ug/ kg/ min.

Patients in OFA,anesthesia induction will receive ketamine 1 mg/kg ,propofol 1% 2-3mg/kg, rocuronium 0.6-1mg/kg. Anesthesia maintenance with 1.5-2% sevoflurane, propofol 1% 3-6mg/kg/hr , dexmedetomidine of 0.4-0.8ug/ kg/ hr.

Number of desaturation events (oxygen saturation by pulse oximetry (SPO2) <90%) during the first postoperative night's sleep

Comparison of the severity of postoperative pain in both group using the Face, Legs, Activity, Cry, Consolability scale for children between the ages of 3 months and 7 years. The scale has five criteria, which are each assigned a score of 0, 1 or 2.The scale is scored in a range of 0-10 with 0 representing no pain.

Comparison of the severity of postoperative pain in both group using Visual Analogue Scale for children aged 7 years and more. We instruct the patient to point to the position on the line between the faces to indicate how much pain they are currently feeling. The far left end indicates "no pain"(0) and the far right end indicates "worst pain ever."(10)

Inclusion Criteria: American Society Anesthesia I, II； Age between 3 months and 12 years; Exclusion Criteria: allergy to anesthetic and analgesic drugs; history of neuromuscular; renal, neurological, hepatic disease; cardiopulmonary diseases; bradycardia