Dexametomedine Versus Ketamine as an Adjuvant in Ultrasound Guided Erector Spinae Block for Perioperative Thoracotomy Pain Control in Pediatrics Cardiothoracic Surgeries: A Randomized Controlled Trial

Following approval from research and ethics committee ,preoperative preparation, and induction of anesthesia Patients will be allocated to three groups according to the type of drug injected.

Group bupivacaine(Control) (B) received 0.5 ml/kg bupivacaine 0.25% diluted with isotonic saline (total volume15 ml).

Group bupivacaine - ketamine (K) received 0.5 ml/kg bupivacaine 0.25% with ketamine 2 mg/kg, diluted with isotonic saline (total volume15 ml).

Group bupivacaine - Dexametomedine (D) received 0.5 mL/kg bupivacaine 0.25% with dexmedetomidine 1 µg/kg. diluted with isotonic saline (total volume 15ml).

Unilateral Ultrasound-guided erector spinae block will be applied in both groups after the induction of anaesthesia. All patients will be tilted onto their left side (lateral position). while the ultrasound-guide unilateral erector spinae block will be performed under completely aseptic conditions. The anatomy will be examined by ultrasonography at 5-6Hz with a35 mm linear probe and a SonoSite M-turbo system (Fujifilm SonoSite, Inc., USA). a 22 g bevel needle will be advanced in a cephalad to caudad direction until the tip of the needle reach' the plane deep to the erector spinae muscle and immediately lateral to the transverse process. Once confirmed, after careful aspiration to demonstrate the absence of air or blood. An injection in this plane permitted the block to impact both the dorsal and ventral rami as they exited from the thoracic spine to innervate the chest wall. the block permits a diminished sensation spanning the T3-T10 dermatome levels. confirming the correct tissue plane by hydro-dissection.