Stroke Volume Variation and Plethysmography Variability Index as Goal Directed Fluid Therapy in Major Oncosurgeries

Patients will receive intraoperative maintenance Fluids as crystalloids to maintain SVV \<11%, for values \>11%colloid bolus 6%hydroxyethyl starch will be given and fluid responsiveness noted.

Patients will receive intraoperative maintenance Fluids as crystalloids to maintain PVI \<10%, for values \>10%colloid bolus 6%hydroxyethyl starch will be given and fluid responsiveness noted.