IRCT2014080218649N1 IRCT 2015-04-14 Golestan University of Medical Sciences, Deputy of Research and Technology Comparison of two methods of oxygen therapy Comparison the effect of oxygen therapy with face mask and nasal cannula on blood oxygen saturation, nausea, vomiting and patient comfort in patients undergoing spinal anesthesia during Caesarean section at Shohada hospital in Gonbad 2014-08-06 anticipated 50 Complete https://irct.ir/trial/16846 interventional Randomization: Randomized, Blinding: Not blinded, Placebo: Not used, Assignment: Parallel, Purpose: Supportive, Other design features: The samples will be selected by through convenience method and then they will be allocated in two groups using table of random numbers. 4 Condition 1: Oxygen therapy. Condition 2: Oxygen therapy. Condition 3: Oxygen therapy. Intervention 1: Patients in this group will receive oxygen 8 liters per minute via face mask in two steps: immediately after administration of spinal anesthesia and at postoperative recovery unit. During the entire operation and up to 30 minutes after in the recovery unit oxygen saturation will be measured via pulse oximetry. Nausea, vomiting and patient comfort will be measured also. Intervention 2: Patients in this group will receive oxygen 4 liters per minute via nasal cannula in two steps: immediately after administration of spinal anesthesia and postoperative recovery unit. During the entire operation and up to 30 minutes after in the recovery unit oxygen saturation will be measured via pulse oximetry. Nausea, vomiting and patient comfort will be measured also.