Dexmedetomidine Versus Ketamine-midazolam Sedation in Awake Fiberoptic Intubation in Suspected Difficult Airway

In Dexmedetomidine group: patients received an intravenous dose of dexmedetomidine at 1 mcg/kg over 10 min in 100 mL normal saline followed by continous infusion of dexmedetomidine at 0.2mcg/kg/h up to 0.7mcg/kg/hr till reaching Ramsay sedation score 2-3

In Ketamine Midazolam group: patients received midazolam 0.02 mg /kg IV then 2 minutes later take ketamine 0.25 mg/kg IV and we will repeated this mixture till reaching Ramsay sedation score 2-3