IRCT20201126049500N1 IRCT 2022-01-03 Tehran University of Medical Sciences The effect of ilio-inguinal block of iliohypogastric on analgesia in children Evaluation of the effect of ilio-inguinal block iliohypogastric by Landmark method with different doses of ropivacaine on intra and postoperative analgesia in children with inguinal hernia. 2022-01-21 anticipated 63 Complete https://irct.ir/trial/58587 interventional Randomization: Randomized, Blinding: Double blinded, Placebo: Not used, Assignment: Parallel, Purpose: Treatment, Randomization description: The samples will be identified by the Randomization (Restricted Randomization) block method with 6 blocks and using a random number table of Random Allocation Software. Random allocation software will be used to generate random sequences by blocking method. Allocation concealment will be used to execute random sequences on participants. Each random sequence generated will be recorded on a card and the cards will be sealed in opaque envelopes. In order to maintain a random sequence, the envelopes are numbered in the same way on the outer surface, and finally the letter envelopes are glued and placed in a box, respectively. Registration of participants, based on the order of entry of eligible participants into the study, one of the envelopes of the letter is opened in order and the assigned group of the participant is revealed, Blinding description: The study is double-blind. The patient does not know which group he is in. The researcher is an anesthesiologist who performs the nerve block and knows which group the patient is in. The person who monitors the patient and evaluates the outcome is an anesthesia nurse who does not know the patient group. the data analyzer also does not know the patient group. The group number is recorded in the patient information sheet and the type of intervention of each group is not recorded. N/A Intraoperative and postoperative pain. Intervention 1: Intervention group: Children 1 to 7 years old undergoing unilateral inguinal hernia surgery, ilio-inguinal iliohypogastric block with a dose of 0.1cc / kg ropivacaine 0.2%. Intervention 2: Intervention group: Children 1-7 years old undergoing unilateral inguinal hernia surgery, ilioinguinal iliohypogastric block with 0.2 cc/kg ropivacaine 0.2%. Intervention 3: Intervention group: Children 1-7 years old undergoing unilateral inguinal hernia surgery, ilioinguinal iliohypogastric block with 0.3 cc/kg ropivacaine 0.2%. 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 At the end of the study, I will decide according to consultation with the other project colleagues.