Intervention
Procedure:
• ultrasound guided peng block in paediatric hip surgery
On the supine position, under strict aseptic technique, a linear, high-frequency transducer (5-13 MHz) of a Sonosite (M-Turbo; Sonosite Inc, Bothell, W, USA) portable US machine will be placed in the transverse plane along the anterior inferior iliac spine (AIIS) to identify the iliopsoas muscle, femoral artery, and femoral nerve. The probe will be then rotated, and aligned with the pubic ramus to visualize the AIIS, iliopubic eminence (IPE), femoral artery, psoas muscle, and the superior pubic ramus.
Under direct visualization, a needle will be advanced in-plane, lateral to medial between the psoas tendon and pubic ramus until the needle contacts the IPE. The needle will be slightly withdrawn, and following negative aspiration, 0.5 ml/kg of bupivacaine 0.25% will be injected.
• ultrasound guided caudal epidural block in paediatric hip surgery
On lateral decubitus position, under strict aseptic technique, the sacral hiatus will be visualized at the level of the sacral cornua by employing a linear, high-frequency transducer (5-13 MHz) of a Sonosite (M-Turbo; Sonosite Inc, Bothell, W, USA) portable US machine will be placed transversely at the midline to obtain a transverse view of the two cornua, sacrococcygeal ligament, sacral bone, and sacral hiatus. At this level, the ultrasound transducer will be rotated to 90 degree to obtain longitudinal views of the sacrococcygeal ligament and sacral hiatus and subsequently placed between the two cornua. A needle will be advanced toward the upper third of the sacrococcygeal ligament. The needle advancement will be terminated immediately after penetrating the sacrococcygeal ligament. (17) At this level, after confirming absence of blood or cerebrospinal fluid on aspiration, bupivacaine 0.25% (0.5 mL/kg) will be injected over 1 minute while observing an ultrasound longitudinal image.