IRCT138806192440N1 IRCT 2010-02-20 Affairs Research and Information Management, Kurdistan University of Medical sceinces The effect of supplemental oxygen therapy on the rate of complications after cesarean surgery with Spinal anesthesia method in Besat hospital of Sanandaj The effect of supplemental oxygen therapy on the incidence and severity of complications after cesarean surgery with spinal anesthesia method in educational and medical center of Besat-Sanandaj 2009-11-21 anticipated 120 Complete https://irct.ir/trial/2162 interventional Randomization: Randomized, Blinding: Not blinded, Placebo: Not used, Assignment: Parallel, Purpose: Supportive. 3 the complications after caesarean surgery with the spinal anesthesia method. Intervention 1: oxygen 60% equivalent to 10 liters per minute will be used during anesthesia and surgery and after surgery in recovery section for 6 hours using the Venturi mask. Intervention 2: In control group routine care will be performed (oxygen 30% equivalent to 3-5 liters per minute).