Pulmonary function: Pulmonary function will be evaluated by measured overall mechanical ventilation time, peak inspiratory pressures (PIP), plateau pressures, physiologic dead space and static and dynamic lung compliance. Bronchoalveolar lavage (BAL) will be performed 3 hours after operation (while the patient is anesthesized and intubated) and extracted fluid will be analyzed for inflammatory markers. A-a DO2 calculation [AaDO2 = (713 x FiO2) - (pCO2 / 0.8) - (paO2)] will be measured daily.