IRCT20120915010841N25 IRCT 2021-09-20 Hamedan University of Medical Sciences Evaluation of csf aspiration in spinal anesthesia Evaluation of the effect of 0.2 ml of cerebro-spinal fluid aspiration at the end of intrathecal injection of bupivacaine 0.5% on the onset time and sensory block level in cesarean section under spinal anesthesia. 2021-09-22 anticipated 60 Complete https://irct.ir/trial/58197 interventional Randomization: Randomized, Blinding: Double blinded, Placebo: Not used, Assignment: Parallel, Purpose: Prevention, Randomization description: In this study, we will use the quadruple Block Randomization method. For this purpose, we prepare four sheets of paper.Write the letter A on two sheets and the letter B on the other two sheets. Mix the sheets together and place them in the desk drawer. With the referral of each eligible patient, one of the sheets is randomly taken out and based on this sheet is A or B, it will be assigned to one of the two groups of aspiration and non-aspiration. After randomly pulling out all four sheets, all the papers are returned to the drawer and the above procedure will be continued for the next four patients until the desired sample size is reached, Blinding description: The patients are placed under spinal anesthesia by an anesthesiologist in a sitting position and based on randomization , the patients undergoing aspiration or non-aspiration of cerebro-spinal fluid at the end of spinal anesthesia and then the vital signs, the level and quality of sensory and motor blocks were measured and recorded by Pinprick, VAS and bromage score by the researcher (intern) who has no information on randomization . 2-3 Spinal anesthesia in cesarean sectionکد ICD-10خالی. Intervention 1: Intervention group: After receiving 10 ml per kg of serum Ringer, patients were placed in a sitting position and after determining the subarachnoid space with the entry of Quince spinal needle No. 25 at the level of L3-L4 or L4-L5 by an anesthesiologist 10 mg Bupivacaine 0.5% with 2.5 microgram of sufentanil is injected into the subarachnoid space.At the end of the drug injection, in group A (aspiration group), 0.2 ml of CSF is re-aspirated and re-injected into the subarachnoid space, then the spinal needle is removed and the patient is placed in a supine position. Intervention 2: Control group: After receiving 10 ml per kg of serum Ringer, patients were placed in a sitting position and after determining the subarachnoid space with the entry of Quince spinal needle No. 25 at the level of L3-L4 or L4-L5 by an anesthesiologist 10 mg Bupivacaine 0.5% with 2.5 microgram of sufentanil is injected into the subarachnoid space. At the end of the drug injection, in group B (without aspiration), without CSF aspiration, the spinal needle is removed and then the patient is placed in a supine position. 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 Because the study is not finished yet.