IRCT2016072529065N1 IRCT 2017-06-08 Vice chancellor for research of Yasuj University of Medical Sciences The effect of bupivacaine with lidocain and epinephrine composition on the pain in patients undergoing tonsillectomy surgery Comparative effect of local injection of bupivacaine with lidocain and epinephrine composition on post tonsillectomy pain 2016-11-21 anticipated 87 Complete https://irct.ir/trial/23448 interventional Randomization: Randomized, Blinding: Double blinded, Placebo: Not used, Assignment: Parallel, Purpose: Treatment, Other design features: Block Randomize Allocation. N/A Tonsilectomy. Intervention 1: Intervention group: After induction of anesthesia, cold knife tonsillectomy will be performed. 5 minutes before the surgical incision, in the first group 2 mL of 0.125 bupivacaine, in the second group 2 mL of 1% lidocaine and 1:200,000 epinephrine composition, will be injected locally on the bed and around the tonsils with a single technique as a fan of the upper and lower poles of the tonsils and tonsillectomy will be done. The duration of anesthesia and surgery asses, also patients' vital signs will be recorded before induction of anesthesia, during surgery and in the recovery room. After surgery and transferring the patients of recovery room to the ENT ward, patients' Vital Signs and demographic data collected by check list and pain will be measured 2 hours, 4 hours and 6 hours after surgery with Wong-Baker Pain Scale. Intervention 2: Control group: After induction of anesthesia, cold knife tonsillectomy will be performed. There is no intervention in Group 3. The duration of anesthesia and surgery asses, also patients' Vital Signs will be recorded before induction of anesthesia, during surgery and in the recovery room. After surgery and transferring the patients of recovery room to the ENT ward, patients' Vital Signs and demographic data collected by check list and pain will be measured 2 hours, 4 hours and 6 hours after surgery with Wong-Baker Pain Scale.