The aim is to compare the postoperative analgesic effects of Subcostal Transversus Abdominis Plane Block (S-TAP) versus Rectus Sheath Block (RSB) in patients undergoing laparotomy with midline abdominal incision.

Patients were divided into two randomized groups: Group 1 (S-TAP group, n=30) and Group 2 (RSB group, n=30). All patients will receive the same standard general anesthesia per hospital protocol. All blocks will be applied with the same ultrasonography and block equipment, and by the same physician. All patients will receive Paracetamol 1gr and Dexketoprofen 50mg intravenous (IV) 10 minutes prior to skin closure. After the surgery was completed, patients in Group 1 will receive subcostal transversus abdominis plane block (S-TAP) with 20 mL of 0.25% bupivacaine bilaterally (with a total volume of 40 mL). Patients in Group 2 will receive rectus sheath block (RSB) with 20 mL of 0.25% bupivacaine bilaterally (with a total volume of 40 mL). Routine analgesic procedure consisting of 3x1gr Paracetamol and 2x50mg Dexketoprofen will be followed postoperatively for 24 hours. Numeric Rating Scale (NRS) will be used to assess postoperative pain on 1st, 6th, 12th, 18th and 24th hours after the surgery. Tramadol 50mg IV will be administered as a rescue analgesic for all patients if NRS score is equal to or higher than 4. Total Tramadol consumption will be calculated.

Inclusion Criteria:

• Adult patients older than 18 years of age who underwent laparotomy with midline incision under general anesthesia and were American Society of Anesthesiologists (ASA) I-II-III according to the ASA risk classification.

Exclusion Criteria:

• patients who did not give consent,
• patients with coagulopathy,
• patients with signs of infection at the block application site,
• patients using anticoagulants,
• patients with local anesthetic drug allergies,
• patients with unstable hemodynamics,
• patients who could not cooperate during postoperative pain assessment
• patients who received ileostomy or colostomy