Post op pulmonary complications are seen/expected in all except:-

General anesthesia produces changes in respiratory system and can cause post op pulmonary complication. Risk factor: Thoracic surgery/Upper abdomen surgery Cigarette smoker Chronic respiratory disease Emergency surgery Anesthesia time duration if more than 180 minutes Age >70 years/> 65 years Renal failure patient Poor nutritional status Significant Blood loss or blood transfusion