A 12-year-old boy has a severe asthmatic attack with wheezing. He experiences rapid breathing and becomes cyanotic. His arterial $\mathrm{PO}_{2}$ is $60 \mathrm{~mm} \mathrm{Hg}$ and his $\mathrm{PCO}_{2}$ is $30 \mathrm{~mm} \mathrm{Hg}$.
-To treat this patient, the physician should administer

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[II E 3 a (2)]. A cause of airway obstruction in asthma is bronchiolar constriction. $\beta_{2}$-adrenergic stimulation ( $\beta_{2}$-adrenergic agonists) produces relaxation of the bronchioles.

A 12-Year-Old Boy Has a Severe Asthmatic Attack with Wheezing PO2\mathrm{PO}_{2}PO2​

A 12-Year-Old Boy Has a Severe Asthmatic Attack with Wheezing $\mathrm{PO}_{2}$