A Comparative Evaluation of Post-operative Pain Management Using Erector Spinae Plane Block and Oblique Transverse Abdominis Plane Block in Patients Undergoing Laparoscopic Cholecystectomy.

Introduction Acute pain following laparoscopic surgeries interferes with the rehabilitation of the patient. Knowledge about the pain pathway from a particular area helps in blocking pain transmission at different sites. Ultrasonography (USG)-guided peripheral nerve blocks help in controlling pain better than non-steroidal anti-inflammatory drugs (NSAIDS) and opioids since they directly act by interrupting the pain pathway and interfere less with the physiology of the body. This study was planned with the objectives to evaluate the analgesic efficacy of USG-guided erector spinae plane block (ESPB) and oblique subcostal transversus abdominis plane (OSTAP) block in patients undergoing elective laparoscopic cholecystectomy, to compare the analgesic requirements in both groups, and to compare the VAS scores in both groups. Materials and methods A total of 138 patients were randomized into two groups, with 69 patients in each group, and received either bilateral ESP (group 'E') or bilateral OSTAP (group 'O'). Those in group E received the block at the T7 level, and those in group O received the block in the subcostal region, with 20 ml of 0.2% ropivacaine and 4 mg of dexamethasone. The procedures were done after securing the airway. The total analgesic requirement and visual analogue scale (VAS) scoring in the first 24 hours post-operatively were observed, along with intra-operative opioid consumption. The opioid requirement, block-related complications, and patient feedback regarding post-operative pain control were also assessed. The results were analyzed using the Statistical Package for the Social Sciences (SPSS) software version 23.0 (IBM Corp., Armonk, NY). Continuous and categorical data were analyzed using appropriate statistical analysis. A p-value <0.05 was considered statistically significant. Results The VAS scores were significantly lower during the first post-operative day in group E than in group O. In group E, VAS scoring was less than 4 for the first 24 hours post-surgery. In group O, VAS scores remained greater than or equal to 4 after four hours post-surgery, thereby indicating that the patients required opioids. Only seven patients in group E received tramadol, compared to 62 patients in group O. The mean tramadol requirement of seven patients in group 'E' was 65.71 ± 26.3 mg, and the mean tramadol requirement of 62 patients was 114.56 ± 36.8 mg (p = 0.0012). The patients in group 'O' demanded tramadol significantly more times than those in group 'E'. Conclusion It was concluded that USG-guided ESP block provides better pain control and decreases consumption of opioids post-operatively than OSTAP block in patients undergoing laparoscopic cholecystectomy surgeries. The block was found to be safe with no adverse effects, therefore it can be a part of multimodal analgesia.