Aspirin-induced asthma and bronchial hyperresponsiveness.

Area of Science:

• Pulmonary Medicine
• Clinical Immunology
• Pharmacology

Background:

• Aspirin sensitivity can manifest differently in asthmatic and non-asthmatic individuals.
• Understanding airway responsiveness is crucial for managing aspirin-exacerbated respiratory disease.
• The lysine-aspirin (L-ASA) inhalation challenge offers a quantitative method to assess drug-induced airway responses.

Purpose of the Study:

• To evaluate airway responsiveness to methacholine after L-ASA challenge in different aspirin-intolerant groups.
• To characterize the pattern and duration of bronchial response to L-ASA.
• To identify potential markers distinguishing aspirin-sensitive asthmatics from those with urticaria.

Main Methods:

• Administered L-ASA inhalation challenges using a dosimeter method to construct dose-response curves.
• Assessed airway responsiveness to methacholine in four groups: aspirin-sensitive asthmatics, aspirin-sensitive with urticaria/angioedema, equivocal aspirin intolerance, and normal controls.
• Monitored bronchial response patterns, focusing on recovery time from induced bronchoconstriction.

Main Results:

• L-ASA challenge was positive in all aspirin-sensitive asthmatics, showing an "early prolonged reaction" lasting 3-8 hours.
• Five of 18 aspirin-sensitive subjects exhibited increased airway responsiveness post-challenge.
• Airway responsiveness remained normal in aspirin-sensitive non-asthmatic subjects and the other control groups.

Conclusions:

• L-ASA inhalation challenge can transiently increase bronchial hyperresponsiveness in some aspirin-sensitive asthmatics.
• The observed "early prolonged reaction" and enhanced hyperresponsiveness may serve as distinguishing features for aspirin-sensitive asthmatics.
• This challenge method aids in differentiating aspirin-sensitive asthmatics from aspirin-sensitive individuals with urticaria/angioedema.