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Am. J. Respir. Crit. Care Med., Volume 163, Number 7, June 2001, 1546-1550

PC20 Adenosine 5'-Monophosphate Is More Closely Associated with Airway Inflammation in Asthma Than PC20 Methacholine

MAARTEN Van Den BERGE, RONALD J. MEIJER, HUIB A. M. KERSTJENS, DOROTHEA M. de REUS, GERARD H. KOËTER, HENK F. KAUFFMAN, and DIRKJE S. POSTMA

Departments of Pulmonology and Allergology, University Hospital Groningen, Groningen, The Netherlands

Inhalation of a direct stimulus such as histamine or methacholine is generally used to measure bronchial hyperresponsiveness (BHR). Provocation with adenosine 5'-monophosphate (AMP), an indirect airway challenge, has been suggested to be a better marker of airway inflammation than direct challenges. However, so far little information on this subject is available. The aim of our study was to assess whether the concentration of AMP causing the FEV1 to drop by 20% (PC20) is more closely associated with inflammatory parameters in asthma than PC20 methacholine. In 120 patients with atopic asthma (median FEV1 81% predicted [pred], median age 27 yr), PC20 methacholine and PC20 AMP as well as sputum induction, blood sampling, and measurement of nitric oxide in exhaled air were performed. PC20 methacholine was predominantly predicted by FEV1 %pred (explained variance [ev] = 18%) with the percentage of peripheral blood monocytes being a weak additional independent predictor (total ev = 23%). By contrast, PC20 AMP was predominantly predicted by the percentage of eosinophils in sputum (ev = 25%), while FEV1 %pred was only an additional independent predictor (total ev = 36%). PC20 AMP reflects more closely the extent of airway inflammation due to asthma than PC20 methacholine.




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