Transversus Abdominis Plane Block

Transversus Abdominis Plane block is technique of regional anesthesia where the drug is injected in the plane between the Transversus Abdominis and Internal Oblique muscles.The site of injection is Lumbar Trangle of Petit which is bounded by Lattissmus Dorsi, External Oblique and superior border of Iliac Crest. Around 20 ml of drug deposited in the plane will provide analgesia below T10 up to the midline. This is mainly used to provide post op analgesia after infra-umbilical surgeries. For incisions extending above the umbilicus a subcostal block may be added. In that case the total drug injected must be kept in consideration.