Comparison of ultrasound guided Modified Thoraco-Abdominal nerve block through Perichondrial Approach(M-TAPA) with ultrasound guided Subcostal Transversus Abdominis Plane(TAP) block for postoperative analgesia in patients undergoing laparoscopic cholecystectomy.

This randomized controlled study aims to compare the efficacy of two regional anesthesia techniques—M-TAPA and subcostal TAP block—in providing postoperative analgesia for patients undergoing laparoscopic cholecystectomy under general anesthesia. While subcostal TAP block is an established technique targeting the T6–T9 dermatomes, its effect on visceral pain is limited. The novel M-TAPA block is believed to provide a broader somatic and potentially visceral blockade (T5–T12) by depositing local anesthetic under the perichondrium of the costal cartilage. The study will evaluate total tramadol consumption in the first 24 hours postoperatively as the primary outcome. Secondary outcomes include pain scores (NRS), time to first rescue analgesic, time taken to perform the blocks, and block-related complications.