Comparison of Ultrasonography-Guided the Postoperative Analgesic Efficacy of Perichondrial Approach Modified Thoracoabdominal Nerve Block and Recto-Intercostal Fascial Plan Block in Patients Who Underwent Laparoscopic Cholecystectomy

The gallbladder is a small organ located in the right upper quadrant of the abdomen that stores bile, which aids in food digestion. Gallstones form as a result of changes in bile composition caused by hormones, medications, diet, and weight fluctuations. When a gallstone obstructs the cystic duct, acute cholecystitis develops, leading to gallbladder distension and inflammation. Cholecystectomy is the standard surgical treatment performed worldwide for this condition.

Management of acute cholecystitis is either medical - consisting of bed rest, analgesics, antibiotherapy, and intravenous fluid replacement - or surgical, involving removal of the gallbladder. While the procedure can be performed via open or laparoscopic technique, laparoscopic cholecystectomy (LC) is superior in terms of less incisional pain, shorter hospital stay, improved quality of life, and faster recovery.

Despite being minimally invasive, LC can cause moderate-to-severe postoperative pain. The majority originates from incision sites (50-70%), with additional contributions from pneumoperitoneum (20-30%) and the cholecystectomy itself (10-20%). Severe pain leads to delayed mobilization, reduced patient satisfaction, chronic pain development, and increased pulmonary and cardiac complications. A multimodal analgesic approach is therefore recommended. Although NSAIDs, paracetamol, opioids, and local anesthetics are commonly used, opioids carry significant risks including postoperative nausea and vomiting (PONV), constipation, and respiratory depression. Neuraxial analgesia is rarely preferred due to potential complications and technical difficulties.

Ultrasound-guided interfascial plane blocks have gained increasing use in LC due to their safety and efficacy. The anterolateral abdominal wall is composed of the rectus abdominis, external oblique, internal oblique, and transversus abdominis muscles. The transversus abdominis plane contains the T6-L1 thoracolumbar nerves between the internal oblique and transversus abdominis muscles, and local anesthetic injection into this plane provides T7-L1 sensory blockade.

The Modified Thoracoabdominal Nerve Block through Perichondrial Approach (M-TAPA), introduced by Tulgar et al., applies local anesthetic solely to the inferior surface of the costochondral perichondrium at the 9th-10th rib level under ultrasound guidance, targeting T4/T5-T12/L1 thoracoabdominal nerves. It blocks anterior and lateral cutaneous branches to provide abdominal analgesia, with reported efficacy in both minor and major abdominal surgeries.

The Recto-Intercostal Fascial Plane Block (RIFPB), also described by Tulgar et al. in 2023, deposits local anesthetic into the interfascial plane between the rectus abdominis muscle and the 6th-7th costal cartilages, just below the xiphoid process. Methylene blue studies have demonstrated significant spread to the anterior cutaneous branches of T6-T9 and laterally, covering nearly the entire upper anterolateral abdomen. Based on these findings, 20 ml of local anesthetic will be used for RIFPB in this study, targeting T6-T9 dermatomal coverage.

This prospective, randomized, double-blind study aims to compare the postoperative analgesic efficacy of bilateral M-TAPA versus bilateral RIFPB in 70 patients (35 per group) undergoing LC. Both blocks will be applied under ultrasound guidance using 20 ml of 0.25% bupivacaine bilaterally after surgery while patients remain under anesthesia.

Postoperative pain will be assessed using the Numeric Rating Scale (NRS) at 0, 1, 3, 6, 12, 18, and 24 hours. Dermatomal spread will be evaluated at postoperative 2nd and 24th hours via pinprick testing across T3-L1 levels. Opioid consumption will be recorded via tramadol PCA at 0-1, 1-12, 12-24 hours, and total 24 hours. PONV will be monitored using a 4-point scale, and ondansetron rescue doses will be recorded. Quality of recovery will be assessed using the QoR-15 scale (scored 0-150) preoperatively and at 24 hours postoperatively, evaluating physical comfort, pain, physical independence, psychological support, and emotional state.