Place the high-frequency linear probe with the medial end just on top of the linea alba
Visualize the linea alba, the rectus abdominis, and the posterior rectus sheath (see next page)
Use color Doppler to identify the epigastric arteries
Advance the needle through the rectus abdominis muscle until the needle tip enters the space between the belly of the muscle and the posterior layer of the rectus sheath
Inject 10 mL of local anaesthetic per side in adults. In children 0.5 mg ropivacaine/kg can be injected per side
