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Ultrasound guided oblique subcostal transversus abdominis plane block: An observational study on a new and promising analgesic technique

The ultrasound-guided transversus abdominis plane (TAP) block involves local anaesthetics injection into the plane between the transversus abdominis and the internal oblique muscles to block the thoracolumbar intercostal nerves which are derived from anterior divisions of spinal segmental nerves T6 to L1.[1,2] The lateral branches leave the main nerve at the angle of the rib and pass obliquely through the abdominal wall to emerge from the muscles in the mid-axillary line where the needle placement is done during subcostal TAP block.