Abstract
BACKGROUND: Effective management of postoperative analgesia following laparoscopic cholecystectomy (LC) is critical to ensure optimal patient comfort and recovery. This study evaluates the effects of erector spinae plane block (ESPB) and rectus sheath block (RSB) on opioid consumption to determine non-inferiority. METHODS: This retrospective study analyzed 44 patients aged 18 to 75 years who underwent LC at our hospital between December 2022 and March 2023, with American Society of Anesthesiologists (ASA) scores of I-II. Patients were divided into two groups: ESPB (n=24) and RSB (n=20). The ESPB group received a preoperative bilateral injection of 20 mL of 0.25% bupivacaine, while the RSB group received a postoperative bilateral injection of 20 mL of 0.25% bupivacaine. The primary outcome measure was opioid consumption within the first 24 hours postoperatively. RESULTS: The demographic characteristics of the RSB and ESPB groups were similar. Opioid consumption during the first 24 hours was 6.29+-1.73 mg in the ESPB group and 6.60+-3.41 mg in the RSB group, with no statistically significant difference between the two groups (95% confidence interval [CI]: -1.64 to 1.02; p=0.717). When the equivalence margin was set at -2 mg, opioid consumption in the RSB group was found to be similar to that in the ESPB group. Fentanyl rescue analgesia in the postoperative care unit was required by three patients in the ESPB group and five patients in the RSB group (p=0.400). Visual Analog Scale (VAS) pain scores and the number of patients who developed nausea and vomiting in the first 24 hours postoperatively were similar between the groups (p>0.05). CONCLUSION: The erector spinae plane block and RSB demonstrated comparable analgesic efficacy. Rectus sheath block was found to be non-inferior to ESPB in LC surgery with respect to 24-hour opioid consumption. The groups were also similar regarding rescue analgesia, VAS scores, shoulder pain, and the frequency of nausea and vomiting.