title: Postoperative atelectasis.
mesh_terms: D000005:Abdomen / Q000601:surgery; D005260:Female; D006801:Humans; D000860:Hypoxia / Q000209:etiology; D008297:Male; D011183:Postoperative Complications; D001261:Pulmonary Atelectasis / Q000150:complications / Q000209:etiology