Ultrasound Guided Retrolaminar Block Versus Transverse Abdominis Plane Block in Laparoscopic Upper Abdominal Surgeries

Laparoscopic Abdominal Surgeries, Retrolaminar Block, TAP Block

This study aims to compare and evaluate the safety and efficacy of ultrasound guided retrolaminar block versus transverse abdominis plane block in laparoscopic upper abdominal surgeries. Both RLB and TAP blockade are hypothesized to reduce analgesic consumption, manage pain effectively and minimize side effects but their comparative effectiveness has not yet to be thoroughly explored.

Laparoscopic surgery is now a widely accepted practice, offering several advantages, including better cosmetic outcomes, increased patient satisfaction, and shorter hospital stays . The complexity and range of procedures performed laparoscopically have grown significantly, now including complex operations like cholecystectomy, nephrectomy, hernia repair, and an increasing number of emergency surgeries . Despite these benefits, postoperative pain following laparoscopic procedures, such as cholecystectomy, can be substantial and hinder recovery . This pain may negatively affect respiratory function, delay ambulation, and ultimately prolong their hospital stay. Historically, pain management has often relied on high doses of narcotics, which may lead to complications like dizziness, respiratory depression, and postoperative nausea and vomiting (PONV) . These drawbacks have spurred the search for alternative and improved pain relief strategies . Ultrasound-guided nerve blocks have become an essential component of multimodal postoperative analgesia due to their effectiveness, precision, and safety profile . One of such techniques is the Transversus Abdominis Plane (TAP) block, which is used as part of a comprehensive strategy to optimize postoperative pain control. Local anesthetic is injected into the neurovascular plane of the abdominal wall . The TAP block works by providing sensory blockade to the spinal nerves that run between the internal oblique and transverse abdominis muscles. The anesthetic infiltration affects the thoracic intercostal nerves, the ilioinguinal and iliohypogastric nerves, and the lateral cutaneous branches of the lumbar nerves. Another important technique is the Retrolaminar Block (RLB), introduced in 2006 as a simpler alternative to the thoracic paravertebral block (TPVB) . The RLB is less invasive because it targets the bony vertebral lamina, unlike the TPVB, which requires puncturing the superior costotransverse ligament . The procedure involves injecting a local anesthetic (LA) into the fascial plane located between the posterior thoracic lamina and the overlying transversus spinae muscles allowing spread of the local anesthetic to the thoracic paravertebral and epidural spaces, thus the blockade of the dorsal branch of the spinal nerves that cross the retrolaminar plane .Studies, including cadaveric models, have confirmed that the anesthetic injected during an RLB spreads through the intertransverse ligaments into the paravertebral and epidural spaces, effectively numbing 2-4 spinal segments . For instance, a 2022 clinical trial showed that ultrasound-guided RLBs significantly reduced opioid consumption in patients recovering from laparoscopic cholecystectomy compared to conventional pain management , highlighting its potential as a safe and effective option.

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