IRCT20190529043750N3 IRCT 2021-06-28 Babol University of Medical Sciences Comparison of anesthesia levels of intrathecal bupivacaine injection Comparison of anesthesia level of intrathecal injection after 1 and 1.5 cc bupivacaine 0.5% in saddle block 2021-07-27 anticipated 80 Complete https://irct.ir/trial/57072 interventional Randomization: Randomized, Blinding: Not blinded, Placebo: Not used, Assignment: Parallel, Purpose: Treatment, Randomization description: Patients will be randomly assigned to two groups of 40 using 4 blocks and a ratio of 1: 1. The free website www.randomization.com will be used to generate the allocation sequence. The resulting sequence will be written on separate sheets and placed in sealed envelopes and will be provided to the lead researcher for study. 3 Sensory block level. Intervention 1: Intervention group: To create nerve block, 1 cc bupivacaine 0.5% (Abu Reihan Pharmacy) is injected once into the intrathecal space. Intervention 2: Intervention group:To create nerve block, 1.5 cc bupivacaine 0.5% (Abu Reihan Pharmacy) is injected once into the intrathecal space. No - There is not a plan to make this available Justification or reason for not sharing IPD is There is still no plan for its publish.