A prospective observational study to assess the analgesic effects of posterior transversus abdominis plane block and lateral transversus abdominis plane block.

Transversus Abdominis Plane (TAP) Block is a regional anaesthesia

technique that provides analgesia to the parietal peritoneum as well as

the skin and muscles of the anterior abdominal wall. This technique

involves injection of a local anesthetic solution into a plane between

the internal oblique muscle and transversus abdominis muscle,

targeting anterior rami of thoracolumbar nerves originating from the

T6 to L1 spinal roots, which provide sensory function to the

anterolateral abdominal wall.

Traditionally, TAP block has been performed under ultrasound guidance using one of four different approaches, targeting different areas of the anterior abdominal wall:

subcostal TAP block provides analgesia to the anterior cutaneous

branches of the thoracolumbar nerves T6–9, oblique subcostal TAP

block delivers analgesia to anterior cutaneous branches T6-L1,

posterior TAP block targets anterior cutaneous branches T9–12, and

the lateral/mid-axillary technique blocks the anterior cutaneous

branches T10–12. The analgesic effects obtained with TAP block

extend from the anterior abdominal wall and parietal peritoneum to

the lateral cutaneous branches of T9-L1.

In this study, we will be comparing the effectiveness of posterior and lateral approaches.