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Application for ESRA Abstract Prizes: I apply as an Anesthesiologist (Aged 35 years old or less)Background and Aims With its rising global prevalence, increasing numbers of patients with morbid obesity are undergoing a wide variety of elective and emergency surgery. Bariatric anesthesia and analgesia research and enhanced recovery after surgery(ERAS) have emphasized the need for protocol standardization and implementation. Especially, in moderate to severe OSA, an opioid- centric approach to pain management in the perioperative period should be avoided to avoid the dose dependent decrease in arousal and the increase in airway obstruction. Ultrasound guided erector spinae block is reported to lead to an analgesic effect on somatic and visceral pain in laparoscopic abdominal surgeries .Methods - Epidural injection group (Group E, n=100): Patient in this group will receive a dose of 25 ml bupivacaine 0.25% in the epidural space. The patient is placed in the sitting position. Identification of intervertebral spaces by palpation. Injection is made at the level of L2-L3 OR L4-L5. - Erectro spinae group (Group S, n=100): Patients in this group will receive a dose of 15 ml bupivacaine 0.5% + 5 ml normal saline on each side. after selecting the target transverse process for nerve block, place the US transducer in a paramediane sagittal orientation, approximately 2 cm from the midline ( spinous process) and try to visualize the transverse process.Results there was a significant difference in the interval time before the call for a rescue analgesia between the two groups, with an average of 6 hours in the epidural group patients, and immediately after recovery for almost all the erector spinae group patient.Conclusions single epidural injection preoperatively is an effective method for control of post laparoscopic bariatric surgery pain