IRCT20120215009014N412 IRCT 2021-12-11 Hamedan University of Medical Sciences Comparison of the hemodynamic effects of the patient position (sitting, right and left lateral position) during induction of spinal anesthesia for caesarean section Comparison of the hemodynamic effects of the patient position (sitting, right and left lateral position) during induction of spinal anesthesia for caesarean section: a randomized clinical trial 2021-12-22 anticipated 105 Complete https://irct.ir/trial/60458 interventional Randomization: Randomized, Blinding: Not blinded, Placebo: Not used, Assignment: Parallel, Purpose: Treatment, Randomization description: The patients will be randomly assigned to intervention and control groups using block randomization. For this purpose, we will prepare six sheets of paper, writing on two sheets the name of the intervention 1 and on two other sheets the name of the intervention 2 and on the third two sheets the name of the intervention 3. The paper sheets will be pooled, placed in a container, and randomly drawn one at a time for each patient without replacement until all six sheets are drawn. The six paper sheets will be then placed back into the container, and this action repeated until the sample size is reached. N/A Cesarean section. Intervention 1: Intervention group 1: Spinal anesthesia for cesarean section in a sitting position with spinal injection of 10 mg bupivacaine hyperbaric 5% plus 2.5 μg sufentanil. Intervention 2: Intervention group 2: Spinal anesthesia for cesarean section lying down on the right side with spinal injection of 10 mg bupivacaine hyperbaric 5% plus 2.5 micrograms sufentanil. Intervention 3: Intervention group 3: Spinal anesthesia for cesarean section lying down on the left side with spinal injection of 10 mg bupivacaine hyperbaric 5% plus 2.5 μg sufentanil. 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 It depends on the situation and the results of the study as well as the approval of the financial supporting organization.