The Effect of Adding Either Propofol or Ketamine to Magnesium and Lidocaine Infusions in Nasal Surgeries.

intravenous infusion of propofol 6-10 mg.kg-1.h-1, lidocaine (lidocaine 2% 400mg in 20 ml) bolus of 1.5 mg.kg-1 followed by infusion with a rate of 1.5 mg.kg-1.h-1 and magnesium sulfate 40 mg.kg-1 loading followed by infusion of 20 mg.kg-1.h-1. the effect of either Propofol injection, or ketamine injection or dexmeditomidine injection on intraoperative bleeding

Patients will receive intravenous infusion of Ketamine 0.1-0.2 mg.kg-1.h-1 (intravenous infusion of propofol 6-10 mg.kg-1.h-1, lidocaine (lidocaine 2% 400mg in 20 ml) bolus of 1.5 mg.kg-1 followed by infusion with a rate of 1.5 mg.kg-1.h-1 and magnesium sulfate 40 mg.kg-1 loading followed by infusion of 20 mg.kg-1.h-1. dose of 1 mg.kg-1), lidocaine bolus of 1.5 mg.kg-1 followed by infusion with a rate of 1.5 mg.kg-1.h-1 and magnesium sulfate 40 mg.kg-1 loading followed by infusion of 20 mg.kg-1.h-1.

Dexmeditomidine (Precedex® 200 mcg.2ml-1) with a rate of 0.2-0.6 mcg.Kg-1.h-1. lidocaine bolus of 1.5 mg.kg-1 followed by infusion with a rate of 1.5 mg.kg-1.h-1 and magnesium sulfate 40 mg.kg-1 loading followed by infusion of 20 mg.kg-1.h-1