Airway responses to hyperventilation of cold dry air: Duration of protection by cromolyn sodium

The magnitude and duration of the inhibitory effect of three doses of cromolyn sodium on the airway response to hyperventilation of cold dry air was examined in a double-blind, randomized controlled trial. Eight subjects with well controlled asthma were studied. On 4 separate days, doses of either 2 mg, 10 mg, 20 mg, or placebo were administered by metered-dose inhaler. Twenty minutes, 2 hours, and 4 hours after each medication, airway …