IRCT2016101914049N4 IRCT 2017-02-08 Vice chancellor for research, Jahrom University of Medical Sciences The Effect of intrathecal Magnesium Sulfate on duration of analgesia after cesarean section Clinical trials of the Effect of intrathecal Magnesium Sulfate on duration of analgesia after cesarean section, with spinal anesthesia, compared with patients undergo a normal routine 2014-10-22 anticipated 69 Complete https://irct.ir/trial/13753 interventional Randomization: Randomized, Blinding: Double blinded, Placebo: Used, Assignment: Parallel, Purpose: Treatment, Other design features: For blinding in the present study, a double-blind method is used in a way that (1) the person who reviews the results and (2) the person who performs the injections are unaware of which patients did not received sulfate magnesium and which ones did not have any distilled water. N/A Condition 1: Scores Pain after injection of sulfate magnesium. Condition 2: duration of analgesia after injection of sulfate magnesium. Intervention 1: Intervention group: In the first intervention group, the patient received 2 cc Bupivacaine 0.5%+ 0.3 cc normal saline+0.5 cc magnesium sulfate 10% (group M50) at the beginning of surgery and after entering the maternity ward; the score of pain, duration of analgesia and Hemodynamic signs measured and recorded at mentioned time. Intervention 2: Control group: patients received 2 cc Bupivacaine 0.5%+ 0.8 cc normal saline at the same time with the start of surgery and their score of pain, duration of analgesia and Hemodynamic signs recorded after entering maternity ward. Intervention 3: Intervention group: In the second intervention group, the patient received 2 cc Bupivacaine 0.5%+ 0.8 cc magnesium sulfate 10% (group M80) at the beginning of surgery and after entering the maternity ward; the score of pain, duration of analgesia and Hemodynamic signs measured and recorded at mentioned time.