IRCT2013013112320N1 IRCT 2013-11-05 Jundishapour University of Medical Sciences Vice Chancellory for Research and Technology Development Assessment of the effect of intra abdominal pressure during operation on nausea & vomiting after laparoscopic cholecystectomy. Comparison of low pressure versus high pressure gas injection at abdominal cavity on post operative nausea &vomiting after laparoscopic cholecystectomy. 2012-12-30 anticipated 50 Complete https://irct.ir/trial/12401 interventional Randomization: Randomized, Blinding: Double blinded, Placebo: Not used, Assignment: Parallel, Purpose: Prevention. N/A Nausea & Vomiting after laparascopic Cholesystectomy. Intervention 1: At group 1 patients recieve induction with drugs without antiemetic effects then from the surgeon will be asked to do laparascopic cholecystectomy with the least amount of gas injection into the abdominal cavity ,to conclude that to postoperative nausea & vomiting ,be compared with the other patient at group 2 that had been operated with high gas pressure. Intervention 2: At group 2 patients recieve induction with drugs without antiemetic effects then from the surgeon will be asked to do laparascopic cholecystectomy with the maximum of standard pressure of gas injection into the abdominal cavity,to conclude that to postoperative nausea & vomiting,be compared with the other patients at group 1 that had been operated with low gas pressure.