title: The dead space after addition of oxygen and premedication with narcotics and belladonna drugs.
mesh_terms: D000328:Adult; D001532:Atropa belladonna; D006331:Heart Diseases / Q000601:surgery; D006801:Humans; D008875:Middle Aged; D009294:Narcotics; D010100:Oxygen; D010946:Plants, Medicinal; D010947:Plants, Toxic; D011229:Preanesthetic Medication; D012126:Respiratory Dead Space
chemical_list: D009294:Narcotics; D010100:Oxygen