Nebulized Lidocaine, Dexmedetomedine and Their Combination in Direct Laryngoscopy Surgery

will receive nebulized lidocaine 2%, 1 mg/kg with a maximum dose of 100 mg (5 ml).

will receive nebulized dexmedetomidine (1 μg/kg diluted in 5 ml of saline 0.9%).

will receive nebulized lidocaine 2% (0.5 mg/kg) and dexmedetomidine 0.5 μg/kg dexmedetomidine in 5 ml of saline 0.9%.

will receive nebulized saline 0.9% (5 ml) as control group.