Effect of Addition of Dexmedetomidine or Ketamine to Intravenous Infusion of Lidocaine on Proinflammatory Cytokines in Pelvi-abdominal Cancer Surgeries.

Patients will receive 1.5mg /kg lidocaine 2%; intravenously as a bolus dose then 1.5mg/kg/hr lidocaine infusion using a 50cc syringe pump intra-operatively.

Patients will receive same infusion regimen of lidocaine 2%; as in group L plus 0.35 mg/kg ketamine intravenously as a bolus dose, followed by intravenous infusion of 0.2 mg/kg/h using a 50cc syringe pump intra- operatively.

Patients will receive same infusion regimen of lidocaine 2%; as in group L plus 0.5 μg/kg dexmedetomidine intravenously as a bolus dose, followed by intravenous infusion of 0.4 μg/kg/h using a 50cc syringe pump intra-operatively.