title: [Clinical study of the relationship between pre-oxygenation time and arterial oxygenation].
mesh_terms: D000328:Adult; D000367:Age Factors; D000368:Aged; D001158:Arteries; D006801:Humans; D008875:Middle Aged; D010100:Oxygen / Q000097:blood*; D010102:Oxygen Inhalation Therapy / Q000379:methods*; D011229:Preanesthetic Medication / Q000379:methods*; D013997:Time Factors
chemical_list: D010100:Oxygen