The Relationship of Preoperative Intravenous Dextrose Infusion to Postoperative Nausea and Vomiting in Gynecological Laparoscopic and Hysteroscopic Surgeries: A Randomized Control Trial

A history of PONV risk factors will be recorded. After consenting, patients will be assigned using a computerized randomization function to Ringer solution (group R) or 5% dextrose (group D) or control group (group C). Group D will receive 1 mL/kg/h 5% Dextrose infusion, applied preoperatively during fasting until induction of anesthesia. Group R will receive 1 mL/kg/h ringer infusion, applied preoperatively during fasting until induction of anesthesia. Group C will receive no fluids. The anesthesia providers, surgeons, perioperative nurses, postanesthesia care unit (PACU) nurses and investigators will be blinded to group assignment throughout.

As for pre-medication, all patients will receive IV midazolam (0.02 mg/kg). Anesthesia will be induced with propofol (1.5-2 mg/kg), fentanyl (1-2 μg/kg) and atracurium(o.5mg/kg) to facilitate endotracheal intubation. The lungs will be mechanically ventilated and anesthesia will be maintained with isoflurane in O2/air. Intraoperative IV maintenance fluid will be standardized at 3 mL/kg/h with additional IV crystalloid given as needed at the discretion of the anesthesia provider if arterial blood pressure decreased >20% from baseline. For postoperative pain relief, paracetamol 1 g will be given I.V. during surgery in all patients and continued orally after operation (1g every 6 h). In addition, all patients will be ambulated within 6 h after completion of surgery. Standardized antiemetic and analgesic rescue medications will be available. Patients will receive no rescue antiemetic medication when the VRS score is 0 to 2; 1 dose of rescue medication when the VRS score is 3 to 6; and ≥2 doses for nausea score of 7 to 10, to reduce the nausea score to 0 to 2.