Clinical Research Directory

After placing the patient in the left lateral position (hips and knees flexed) following monitoring and induction of anaesthesia, the field will be sterilized with 70% alcohol in 2% chlorhexidine. Initial scanning in the transverse plane allows for visualization of the midline and identification of the sacrococcygeal ligament between the 2 sacral cornua. The 2 cornua resemble the 2 eyes of a frog and thus are collectively called the frog-eye sign. The US probe is then rotated 90 degrees to acquire a longitudinal view. The needle is then advanced at a 20-degree angle with needle tip and length visualization Once the needle is confirmed to be in the caudal space on the screen, carefully aspirate to confirm absence of CSF or blood. A slow injection of the local anaesthetic can then be performed, dose of (0.2 mL/kg 0.25% bupivacaine and 1 μg/kg of dexmedetomidine

after general anesthesia induction. With the patient in the supine position. After skin sterilization the US linear probe will be transversely placed on the root of the penis. After placing the penis in gentle traction, a50 mm block needle will be inserted from the lateral part of the penis root towards the dorsal section of the penis with the in-plane technique, It will be advanced through Dartos fascia until resistance to the needle disappeared. Once the superficial sheath will be passed, the tip of the needle will be advanced into Buck's fascia and then positioned between Buck's fascia and tunica albuginea, lateral to the dorsal artery. After making sure there will be no blood with negative aspiration, half of the total 0.2 mL/kg dose of 0.25% bupivacaine will be administered while observing its distribution with US. The same procedure will be then repeated on the other side of the penis.