title: Platypnea and orthodeoxia: a report of three cases and hypothesis in pathogenesis.
mesh_terms: D000368:Aged; D018288:Carcinoma, Small Cell / Q000150:complications; D004417:Dyspnea / Q000209:etiology*; D005260:Female; D006491:Hemothorax / Q000150:complications; D006801:Humans; D000860:Hypoxia / Q000209:etiology*; D008171:Lung Diseases / Q000150:complications*; D008175:Lung Neoplasms / Q000150:complications; D008297:Male; D008875:Middle Aged; D011014:Pneumonia / Q000150:complications; D011187:Posture; D014397:Tuberculosis, Pulmonary / Q000150:complications