Cardiac index ( CI ) , mean arterial pressure ( MAP ) , pulmonary capillary wedge pressure ( PCWP ) , systemic vascular resistance index ( SVRI ) , pulmonary artery pressure ( PAP ) , pulmonary vascular resistance index ( PVRI ) , alveolo-arterial oxygen difference ( AaDO2 ) , pulmonary shunt fraction ( Qs/QT ) , extravascular lung water ( EVLW ) , COP , fluid balance and body weight were evaluated peri-operatively .