Duration of Postop Analgesia After Inguinal Hernia Surgery Treated with TAP Block Vs II/IH Nerve Block

The probe was placed in a plane transverse to the lateral abdominal wall in the mid-axillary line immediately cephalad to the iliac crest. The needle was advanced immediately anterior to the probe using the in-plane needle-probe orientation and advanced posteriorly until the needle was observed to penetrate the interface between the internal oblique and transversus abdominis muscles. Thereafter, a local anesthetic (0.2 mL/kg of 0.25 % bupivacaine) was injected incrementally, and the spread was observed within the plane.

The ultrasound probe was placed immediately medial and slightly cephalad to the upper aspect of the anterior superior iliac spine to obtain a short-axis view of the nerves situated between the two abdominal muscles (internal oblique and transversus abdominis), A 22 G needle tip ~1 cm caudal to the probe surface was introduced and was advanced until a characteristic 'tenting' of the interface between the two muscles was seen and was then further advanced deep to this interface until a pop was felt and then the injectate (0.2 mL/kg of 0.25 % bupivacaine) was observed spreading between these two layers.