title: Postopertive atelectasis.
mesh_terms: D006801:Humans; D000860:Hypoxia / Q000209:etiology; D010100:Oxygen / Q000097:blood; D010313:Partial Pressure; D011183:Postoperative Complications; D001261:Pulmonary Atelectasis / Q000209:etiology
chemical_list: D010100:Oxygen