Comparison of Bilateral Versus Unilateral Transversus Abdominis Plane Block Combined with Spinal Anesthesia in Laparoscopic Appendectomy: A Retrospective Observational Study

<b>Background/Objectives:</b> Laparoscopic appendectomy (LsA) is a standard acute surgical procedure typically performed under general anesthesia (GA). However, GA is associated with side effects such as hemodynamic instability and postoperative nausea/vomiting. Regional anesthesia (RA) has gained attention as an effective alternative in such surgeries, as it reduces surgical stress responses, provides adequate postoperative analgesia, and promotes early mobilization. This study evaluates the effectiveness of the combined use of spinal anesthesia (SA) and transversus abdominis plane block (TAPB) in LsA procedures. <b>Methods:</b> This retrospective observational study included 220 patients who underwent LsA between 2020 and 2023. Patients were divided into two groups: Group 1 (<i>n</i> = 110) received bilateral TAPB, and Group 2 (<i>n</i> = 110) received unilateral TAPB, both under SA. Postoperative pain was assessed using the Visual Analog Scale (VAS), and outcomes such as time to first analgesic requirement, analgesic consumption, and patient satisfaction were recorded. <b>Results:</b> This study evaluated the effects of SA combined with TAPB in LsA. Bilateral TAPB significantly prolonged the time to first analgesic request (13.7 vs. 12.1 h; <i>p</i> = 0.001) and reduced analgesic requirements (<i>p</i> = 0.008) compared to unilateral TAPB. VAS scores were significantly lower in Group 1 at the 9th and 12th hours postoperatively (<i>p</i> = 0.003 and <i>p</i> = 0.039). Although overall satisfaction scores were similar, a higher proportion of patients in Group 1 reported being "very satisfied" or "excellent" (55.5% vs. 42.7%). <b>Conclusions:</b> The combination of spinal anesthesia and bilateral TAPB is a safe and effective anesthetic strategy for LsA. Compared to unilateral TAPB, it offers superior postoperative analgesia and improved patient satisfaction.