Sphenopalatine Block vs Dexmedetomidine Infusion in Trans Nasal Endoscopic Pituitary Surgery

patients will receive ultrasound guided bilateral supra-zygomatic sphenopalatine ganglion block.

patients will receive 1 µg/kg dexmedetomidine within 10 minutes, followed by maintenance dose throughout the surgery.

patients will be operated under general anesthesia including routine protocol for these cases