IRCT20190202042589N1 IRCT 2019-02-14 Birjand University of Medical Sciences The Effect of Low-Dose Intravenous Ketamine on prevention of post dural puncture headache The Effect of Low-Dose Intravenous Ketamine on prevention of post dural puncture headache in patients undergoing Cesarean delivery by spinal anesthesia 2019-02-20 anticipated 70 Complete https://irct.ir/trial/37307 interventional Randomization: Not randomized, Blinding: Double blinded, Placebo: Used, Assignment: Parallel, Purpose: Prevention, Blinding description: Patients are not aware of the type of prescribed medications which are in uniform syringes encoded by one of the operating room nurses who are not in the study. The investigator is not informed about the groups until the end of the data collection. 3 Headache after spinal anesthesia due to dural puncture. Intervention 1: Intervention group: About 5 minutes before surgery, patients in the intervention group receive 0.15 mg / kg body weight of ketamine (manufactured by STEROP Belgium) by intravenous injection. Intervention 2: Control group: In the control group, normal saline is used as a placebo. 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 No more information