A 163 cm (5 ft 4 in), 19 year old female with an acute asthma exacerbation is being treated in the ED with continuous albuterol at 5 mg/hr. After 1 hour, the pt has clear BS and HR of 128/min and peak flow of 350L/min. Which of the following should the RT do NEXT?
a. Change to scheduled albuterol at 2.5 mg
b. Administer IV corticosteroids
c. Initiate heliox therapy
d. Add ipratropium (atrovent) at 0.5 mg