title: Usefulness of arterial blood gases in obscure diagnosis.
mesh_terms: D000328:Adult; D001784:Blood Gas Analysis; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011655:Pulmonary Embolism / Q000175:diagnosis*; D012131:Respiratory Insufficiency / Q000175:diagnosis*