The goal of this clinical trial is to learn about effect of intraoperative continuous lidocaine infusion on postoperative pain, gut function and insulin resistance in patients undergoing laparoscopic liver surgery in adults. It will also learn about the safety of this infusion in this setting. The main questions it aims to answer are: does the intraoperative continuous systemic lidocaine infusion lower the opioid consumption 24h after surgery? Is the time to first flatus after surgery reduced? Is there increases in insulin resistance after intraoperative lidocaine infusion? Researchers will compare intraoperative continuous systemic lidocaine infusion to a placebo (a look-alike substance that contains no drug, which will be normal saline administered at the same volume, infusion rate and timing) to see if intraoperative continuous systemic lidocaine infusion reduces postoperative pain after laparoscopic liver resection. Participants will receive intraoperative continuous systemic lidocaine infusion or placebo. Clinical assessment will be based on gathering data of NRS scores after the surgery, time to first flatus or stool. How much opioids the patients need in the first 3 postoperative days. Laboratory assessment will include the evaluation of fasting blood glucose concentration and insulin levels preoperatively and on 1, 2 and 3 postoperative days.
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opioid consumption during the first 24 hours after the surgery
Timeframe: First 24 hours after the end of the surgery (extubation)