Nasal resistance to air flow has been used to evaluate the effect of beclomethasone dipropionate aerosol on allergen induced nasal stenosis. Sixteen patients with allergic rhinitis due to pollen were investigated in a randomized double-blind cross-over study with beclomethasone dipropionate aerosol and placebo aerosol. Only patients reacting to challenge were chosen. The study was carried out in the pollen-free season. After 1 week on either active or placebo aerosol a basic resistance value was determined followed by allergen challenge. Nasal resistance was determined 15 min and 7 hr after challenge. The aerosols were changed and after another week the procedure was repeated. There was significant preference (P less than 0.01) for beclomethasone dipropionate aerosol.
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