Allergic rhinitis (AR) and asthma are commonly associated, and similar underlying inflammatory processes link both diseases. AR, even in the absence of asthma, is associated with increased levels of exhaled nitric oxide (ENO) and hydrogen peroxide (H(2)O(2)) in exhaled breath condensate, 2 noninvasive markers of lower airway inflammation.
Asthma and Airway Centre of the Toronto Western Hospital, University Health Network, Division of Respiratory Medicine, University of Toronto, 399 Bathurst Street, Toronto, Ontario M5T 2S8, Canada.
