IRCT20190904044685N1 IRCT 2019-10-06 Tehran University of Medical Sciences Comparison of Post-Operative Nausea and Vomiting (PONV) with Total Intravenous Anesthesia (TIVA) versus Inhalational Anesthesia in elective laparotomic abdominal surgery; A Randomized Clinical Trial Comparison of Post Operative Nausea and Vomiting (PONV) with Total Intravenous Anesthesia (TIVA) versus Inhalational Anesthesia in patients undergoing Elective Laparotomy in Imam Khomeini Hospital Complex-Tehran (IKHC) 2018-08-23 anticipated 100 Complete https://irct.ir/trial/41928 interventional Randomization: Randomized, Blinding: Single blinded, Placebo: Not used, Assignment: Parallel, Purpose: Prevention, Randomization description: randomization on an individual level using 4 number blocks created in excel software. allocation concealment has been carried out, Blinding description: Given the patients' anesthesia after receiving the induction-which is identical in both groups-the patient is blind to the kind of anesthesia. Due to the apparent difference between the two types of anesthesia (the mask for inhalation group and IV medication for TIVA) the anesthesiologist (PI) and the researcher are not blind to the type of anesthesia received by the patient, so the study is conducted in a single-blinded manner. The personals in charge of gathering and analyzing the data were blinded using codes for groups, to the identity of patients' using codes. 3 post operative nausea and vomiting. Intervention 1: Intervention group: Total IntraVenous Anesthesia. Intervention 2: Control group: inhalational anesthesia. Undecided - It is not yet known if there will be a plan to make this available Justification or reason for indecision in sharing IPD is There is no further information