IRCT20120915010841N10 IRCT 2018-12-12 Hamedan University of Medical Sciences The effect of spinal opioids on labor pain Comparison of intra techal injection of fentanyl and sufentanil on the onset, duration and quality of analgesia in vaginal delivery under spinal anesthesia . 2018-07-23 anticipated 50 Complete https://irct.ir/trial/33948 interventional Randomization: Randomized, Blinding: Double blinded, Placebo: Not used, Assignment: Parallel, Purpose: Treatment, Randomization description: In this study, the randomization method is used as a 4-block . In this way, according to the sample size, 12 blocks are identified, and in each of these four blocks, two of each group will be written in the form of letters A or B. This means that two A and two B are written in each block, although the order of the writing of the four letters A and B will be different in each block. The periodic numbers table will then be used to determine the order of block selection, Blinding description: All patients, after entering the operating room using Angiocath 18, received 500 ml of Ringer serum and patient's primary vital signs are measured by a non-invasive monitoring device. Then the patient is placed in a sitting position and placed under spinal anesthesia with spinal Quincke needle number 25 in L4-L5 or L3-L4 space, and after leaving the cerebrospinal fluid from the needle tip and correcting the subarachnoid space,1.5 ml of one of the two drugs fentanyl or sufentanil that prepared by an anesthetist nurse ((Which does not know the study)) in syringes of the same size and shape , is drawn into sterile syringe by anesthetist and is injected into the sub-arachnoid space, in each patient two groups A or B. Thus, the patient, anesthetist (assessor), and an analyzer are not aware of any prescriptive substance. 2-3 Vaginal delivery under spinal analgesia. Intervention 1: First intervention group: After receiving 500 ml of Ringer's serum patients were placed in a sitting position after and 25 Quinke needle inserted into L3-L4 or L4-L5 space and after observing the coming out of cerebro spinal fluid from the sub arachnoid space, in the first group(A), 1.5 ml of fentanyl is injected by an anesthetist who has no known medication in sterile syringe and injected into the subarachnoid space. Intervention 2: Second intervention group: After receiving 500 ml of Ringer's serum patients were placed in a sitting position after and 25 Quinke needle inserted into L3-L4 or L4-L5 space and after observing the coming out of cerebrospinal fluid from the sub arachnoid space, In the second group(B), 1.5 ml of sufentanyl is injected by an anesthetist who has no known medication in sterile syringe and injected into the subarachnoid space. 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.