Fig. 2From: Transversus abdominis plane block for bilateral orchiopexy in an 8-year-old patient with Eisenmenger’s syndromeTAP block was performed bilaterally with ultrasound echo. Three layers of muscles forming the anterior abdominal wall, from superficial to deep: external oblique (EO), internal oblique (IO), and transversus abdominus (TA). A 22-G Tuohy block needle (ND) was advanced directly towards the TA. Levobupivacaine (LV) (0.25 %) was administered at a total of 10 ml on each side of TABack to article page