IRCT20110313006044N5 IRCT 2022-03-25 Vice-Chancellery for Research Hormozgan University of Medical Sciences Preload versus coload of ringer lactate to prevent hypotension during elective cesarean section under spinal anesthesia Comparison of preload and coload of ringer lactate to prevent hypotension during elective cesarean section under spinal anesthesia 2022-01-21 anticipated 60 Complete https://irct.ir/trial/62535 interventional Randomization: Randomized, Blinding: Single blinded, Placebo: Not used, Assignment: Parallel, Purpose: Prevention, Randomization description: Simple randomization with individuals as units of randomization along with allocation concealment: 60 unclear envelopes and 60 cards with the names of the groups (A, B) will be prepared (30 cards for each group). The cards will be put into the envelopes and the envelopes will be sealed and provided to the investigator. Upon entrance of each patient to the study, the envelopes will be shuffled and one will randomly be selected. The patient will be allocated to group A or B based on the card inside the selected envelope, Blinding description: Due to the difference in the interventions the participants cannot be blinded. However, the investigator and the outcome assessor will be unaware of patients' interventions. 3 Hypotension during cesarean section. Intervention 1: Intervention group: Patients in the preload group will receive 10 ml/kg Ringer’s solution (Samen Pharmaceutical Co., Mashhad, Iran) within 15 min before the blockade. Intervention 2: Intervention group: Patients in the co-load group will receive 10 ml/kg Ringer’s solution (Samen Pharmaceutical Co., Mashhad, Iran) during the blockade. No - There is not a plan to make this available Justification or reason for not sharing IPD is There is no further information.