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.

Evaluation of the effect of ilio-inguinal block iliohypogastric by Landmark method with different doses of ropivacaine on analgesia during and after surgery in children with inguinal hernia.

Double-blind clinical trial with three parallel groups, randomized by simple randomization method. Sample size in each group 21, total 63 patients.

Children 1 to 7 years old who are candidates for unilateral inguinal hernia surgery are admitted to Bahrami Hospital. Conscious consent is obtained from the patient's parents. Patients are randomly assigned to group 1,2 or 3. After induction of anesthesia and vital signs recording , ilioinguinal iliohypogastric block is performed in group 1 with a dose of 0.1, in group 2 with a dose of 0.2, in group 3 with a dose of 0.3 ml / kg ropivacaine 0.2% by Landmark single injection method. Immediately after the surgical incision, the patient's vital signs are re-recorded. After the operation, the severity of the patient's pain is assessed in recovery, and the type and dose of analgesia prescribed are recorded in the recovery and surgery ward. The study is double-blind. The patient and the anesthesiologist and the data analyzer do not know which group the patient is in.

Inclusion criteria: Children 1 to 7 years old with no history of disease and ASA1,2 classification, candidate for unilateral inguinal hernia surgery Conditions of non-entry: dissatisfaction of the patient's parents or legal guardian, allergy to local anesthetics, use of any analgesic.

The patients are allocated in three groups: 1. Ilioinguinal iliohypogastric block with 0.1 ml/kg ropivacaine 0.2% 2. Ilioinguinal iliohypogastric block with 0.2 ml/kg ropivacaine 0.2% 3. Ilioinguinal iliohypogastric block with 0.3 ml/kg ropivacaine 0.2%

Mean arterial pressure; Heart rate; Pain intensity

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.

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.