Ultrasound-Guided Transversus Abdominis Plane Block versus Local Wound Infiltration for Postoperative Analgesia in Patients Undergoing Lower Abdominal Surgery
Background: Postoperative pain after lower abdominal surgery contributes to delayed mobilization, opioid-related side effects, and patient dissatisfaction. Ultrasound-guided transversus abdominis plane (TAP) block and local wound infiltration are two widely practiced regional analgesic techniques whose comparative efficacy remains debated. Objective: To compare the analgesic efficacy of ultrasound-guided TAP block with local wound infiltration in patients undergoing elective lower abdominal surgery under spinal anaesthesia. Methods: In this prospective, randomized, observer-blinded study, 80 ASA I-II patients aged 18-60 years undergoing elective lower abdominal surgery were randomized to receive either a bilateral ultrasound-guided TAP block (Group T, n=40) or local wound infiltration (Group W, n=40), each with 20 mL of 0.25% bupivacaine per side. Postoperative pain was assessed using a visual analogue scale (VAS) at 0, 2, 4, 6, 12, and 24 hours. Time to first rescue analgesia, 24-hour tramadol consumption, postoperative nausea and vomiting (PONV), complications, and patient satisfaction were recorded. Results: Baseline demographic and surgical characteristics were comparable between groups. Group T had significantly lower VAS scores than Group W at 2, 4, 6, 12, and 24 hours (p<0.001 at all time points). Time to first rescue analgesia was significantly longer in Group T (342.5 ± 58.4 min) than Group W (168.7 ± 41.2 min; p<0.001), and 24-hour tramadol consumption was significantly lower in Group T (142.5 ± 32.6 mg vs 218.4 ± 38.9 mg; p<0.001). PONV was numerically lower in Group T (10% vs 22.5%; p=0.13), and patient satisfaction was significantly higher in Group T (87.5% vs 60% rating good/excellent; p=0.005). No block-related complications were recorded in either group. Conclusion: Ultrasound-guided TAP block provides superior, more sustained postoperative analgesia than local wound infiltration after lower abdominal surgery, with reduced opioid requirement and greater patient satisfaction, and should be considered a valuable component of multimodal analgesia where feasible.