title: Effect of dietary caffeine on airway reactivity in asthma.
abstract: The potential influence of dietary caffeine on bronchoprovocation challenges with carbachol was examined in 7 patients with asymptomatic asthma. In a double-blind fashion placebo or caffeine (6 mg/kg body weight; equivalent to approximately 4 cups of coffee) solved in orange juice was administered, and carbachol challenges were performed. The average peak serum concentration achieved 60 min after dosing was 7.6 +/- SD 2.1 mg/l. These caffeine levels did not produce any appreciable attenuation of the bronchoconstrictor response to carbachol inhalations. It thus appears that dietary caffeine is barely a cause of erroneous interpretations of bronchoprovocation challenges with carbachol.
mesh_terms: D000284:Administration, Oral; D000328:Adult; D000403:Airway Resistance / Q000187:drug effects*; D001249:Asthma / Q000503:physiopathology*; D001711:Biotransformation; D001985:Bronchial Provocation Tests; D002110:Caffeine / Q000008:administration & dosage* / Q000097:blood; D002217:Carbachol; D004311:Double-Blind Method; D005260:Female; D006801:Humans; D007700:Kinetics; D008297:Male; D011897:Random Allocation
chemical_list: D002110:Caffeine; D002217:Carbachol