When the patient with asthma fails to respond.
D000280:Administration, Inhalation; D000336:Aerosols; D001249:Asthma / Q000188:drug therapy / Q000628:therapy*; D001993:Bronchodilator Agents / Q000627:therapeutic use*; D006760:Hospitalization; D006801:Humans; D010808:Physical Examination; D012129:Respiratory Function Tests; D013224:Status Asthmaticus / Q000150:complications / Q000188:drug therapy / Q000628:therapy*
D000336:Aerosols; D001993:Bronchodilator Agents