IRCT20200825048515N5 IRCT 2020-10-05 Esfahan University of Medical Sciences The effect of intravenous injection of pethidine and dexmedetomidine to prevent shivering after cesarean section under spinal anesthesia Comparative study of intravenous injection of pethidine and dexmedetomidine to prevent shivering after cesarean section under spinal anesthesia 2020-10-22 anticipated 90 Complete https://irct.ir/trial/51338 interventional Randomization: Not randomized, Blinding: Double blinded, Placebo: Used, Assignment: Parallel, Purpose: Treatment, Blinding description: In order to meet blindness, the drugs will be prepared by an anesthesiologist before the intervention. In terms of the amount of the drug, all drugs will be reached the same volume (3 ml) using distilled water. These syringes will be coded and placed in the operating room and delivered daily to the anesthesiologist, who will prescribe them without knowing the type of medication. Also, the person recording the clinical and basic information of the patients as well as the statistical analyst will not be aware of the type of intervention. 2-3 Shivering after cesarean section. Intervention 1: Control group: For patients, spinal anesthesia in the lateral decubitus position and at the L3 and L4 levels in the midline is performed after the umbilical cord clamp. The patients are then placed in the supine position with some rotation to the right. Normal saline is administered to patients immediately afterward. Intervention 2: Intervention group: For patients, spinal anesthesia in the lateral decubitus position and at the L3 and L4 levels in the midline is performed after the umbilical cord clamp. The patients are then placed in the supine position with some rotation to the right. Patients are immediately given 1 μg / kg dexmedetomidine. Intervention 3: Intervention group: For patients, spinal anesthesia in the lateral decubitus position and at the L3 and L4 levels in the midline is performed after the umbilical cord clamp. The patients are then placed in the supine position with some rotation to the right. Patients are immediately given 0.25 mg of pethidine. No - There is not a plan to make this available Justification or reason for not sharing IPD is There is no further information