IRCT20180723040570N4 IRCT 2020-01-30 Iran University of Medical Sciences Difference of the dead space/tidal volume in intravenous anesthesia and inhaled anesthesia Comparison of the dead space/tidal volume in intravenous anesthesia and inhaled anesthesia in morbid obesity undergoing bariatic surgery 2020-01-05 anticipated 60 Complete https://irct.ir/trial/43831 interventional Randomization: Randomized, Blinding: Double blinded, Placebo: Not used, Assignment: Parallel, Purpose: Treatment, Randomization description: The patients were randomly divided into intervention and control groups using a lottery method. As the names of all participants are placed inside the container. The names are drawn out from the container, respectively, and placed in the intervention and control groups. At the end, the papers containing the names are opened and different groups are determined, Blinding description: Participants and outcome assessor will not aware of the intervention because patients are unable to detect the type of anesthesia after anesthesia, and a vein line is established for both groups. The outcome assessor (in the recovery room) is unaware of the allocation of groups. 3 Bariatric surgery. Intervention 1: Intervention group 1: Intravenous Anesthesia. In this group, premedication with 0.05 mg / kg midazolam and 3 mcg / kg fentanyl and induction with 5mg / kg thiopental and 0.3 mg / kg cisatracurium will be performed. Also, the maintenance will be done with 100 mcg / kg propofol. Intervention 2: Intervention group 2: Inhaled anesthesia. In this group, premedication with 0.05 mg / kg midazolam and 3 mcg / kg fentanyl and induction with 5mg / kg thiopental and 0.3 mg / kg cisatracurium will be performed. Also, the maintenance will be done with one minimum alveolar concentration (MAC). Yes - There is a plan to make this available What will be shared: All individual data of the participants in this study will be shared after unidentifiable individuals When: The access period will start from 2020 to 2022 To whom: Data will be available to researchers working in the university Conditions: Scientific responsible should be received email request for research purposes. Of course, the email must be sent by an academic email. Where to obtain: To access the data, forward email to nnikobakht@yahoo.com How to obtain: The data will be available one month after the responsible person's approval Comments: