Oxygen.
D006801:Humans; D024802:Nurse's Role; D010102:Oxygen Inhalation Therapy / Q000379:methods* / Q000451:nursing; D010353:Patient Education as Topic; D018579:Patient Selection; D055656:Prescriptions; D012131:Respiratory Insufficiency / Q000209:etiology / Q000628:therapy; D006113:United Kingdom