Diastolic function is a combination of ventricular chamber compliance, active myofilament relaxation, and elastic recoil of systolic potential energy. Diastole is classically divided into four stages-isovolumetric relaxation, early rapid filling, late slow filling, and atrial contraction. Isovolumetric relaxation refers to the rapid decrease in LV pressure with little or no change in volume and ends with the opening of the mitral valve and early LV filling. These early phases, sometimes referred to as LV suction, are characterized by a rapid decline in LV intracavity pressure and require energy in the form of ATP to pump cytosolic calcium back into the sarcoplasmic reticulum and enable uncoupling of actin and myosin. Filling later in diastole is more dependent on ventricular compliance. Up to investigator knowledge, the effect of mechanical ventilation on patient hemodynamics is still unclear especially in patients with diastolic dysfunction. The optimal ventilation mode for anesthesia of patient with diastolic dysfunction remains a subject of debate. The primary outcome of this study is to investigate whether the pressure regulated volume-controlled mode (PRVC) in comparison with the volume-controlled mode in patients with diastolic dysfunction is associated with better hemodynamic alterations and different vasopressors support during anesthesia for radical cystectomy.
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The incidence of noradrenaline use during anesthesia.
Timeframe: perioperative time for 24 hours
The incidence of Cardiac output changes during anesthesia .
Timeframe: perioperative time for 24 hours