After extubation, patients will be addmitted to the Department of Anesthesiology and Intensive Care. ABGs and CVBGs will be collected and evaluated, PaO2/FiO2 and dCO2 will be calculated every 6 hours until 72 hours after surgery. On the first postoperative day chest X-ray will be performed and repeated on the following days if developing of pulmonary complications were suspected. Continuous epidural analgesia will be introduced, and evaluated effective if numeric pain rating scale point would be lower than 3 points.