An 18-Year-Old with Severe Asthma Is Brought into the Emergency

An 18-year-old with severe asthma is brought into the emergency department on an nonrebreathing mask; he is in acute respiratory distress.He has been given multiple rounds of bronchodilators and corticosteroids and is still in distress,with an SpO₂ of 85% on the nonrebreathing mask.What therapy should the respiratory care practitioner suggest to the physician at this time?

A) Nitric oxide therapy
B) Heliox therapy
C) Carbogen therapy
D) Hyperbaric therapy