Administration of heliox can be an effective form of therapy in which of the following situations?..

Administration of heliox can be an effective form of therapy
in which of the following situations?

I. Managing postextubation stridor in pediatric trauma
patients

II. Providing ventilatory support for patients with severe
airway obstruction resulting from chronic bronchitis and emphysema

III. Administering anesthetic gases to patients with
small-diameter endotracheal tubes

IV. Delivering oxygen therapy to asthmatic children

a. 1 and 2 only

b. 1 and 3 only

c. 1, 2, and 3 only

d. 1, 2, 3, and 4

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