The Stroke Volume Optimization of Goal Directed Fluid Therapy During Radical Cystectomy

"Hemodynamic variables including stroke volume (SV), stroke volume variation (SVV), stroke volume index (SVI), cardiac output (COP), cardiac index (CI), systemic vascular resistance (SVR), systemic vascular resistance index (SVRI), thoracic fluid content (TFC), corrected flow time (FTC), index of contractility (ICON), systolic time ratio (STR), oxygen delivery (DO2) and oxygen delivery index (DO2I) will be measured by Cardiac output non-invasive monitor (ICONTM, OSYPKA medical cardiotronic GMBH, Elixir, Germany). Heart rate (HR), mean arterial blood pressure (MAP), central venous pressure (CVP) and arterial oxygen saturation (Sao2) will be measured using HP monitor.~If mean arterial blood pressure(MAP) drops below 65 mmHg despite achievement of SVopt and CVPmax in both groups, a bolus dose of 5 mg ephedrine will be given and repeated as needed .Norepinephrine will be given for persistent hypotension.Dobutamine 5 mic/kg/min will be started if cardiac index less than 2.5 l/m2."