Evaluation of an abbreviated adenosine monophosphate bronchial challenge.

Abstract:

RATIONALE:Airway hyperresponsiveness to adenosine monophosphate (AMP) has been validated as a surrogate marker for airway inflammation. We wished to know whether an abbreviated challenge at the final threshold dose would produce the same fall in FEV1 as a full, conventional dose-response challenge. METHODS:Seventeen patients with mild-to-moderate asthma (mean FEV1, 75.5% predicted) attended for a full dose-response protocol, where the highest concentration of AMP to produce > 20% fall in FEV1 was noted, along with the maximum percentage fall and recovery time. Patients returned within 2 days for a further challenge, when they received only the highest concentration (as a single bolus) reached on the previous visit. RESULTS:The mean (+/- SEM) percentage fall in FEV1 after the full challenge was 25.5 +/- 1.3%, and after the abbreviated challenge was 9.4 +/- 2.4%. The mean recovery after the full challenge was 28.13 +/- 4.65 min, and after the abbreviated test was 10.81 +/- 4.27 min. CONCLUSION:An abbreviated challenge using a single bolus dose of AMP grossly underestimates bronchial hyperresponsiveness. Although the pharmacologic half-life of AMP is short (90 s), the lesser response and shortened recovery with the abbreviated challenge suggest a more prolonged physiologic half-life, which in turn may have implications for abbreviated challenge protocols.

journal_name

Chest

journal_title

Chest

authors

Fardon TC,Hodge MR,Lipworth BJ

doi

10.1378/chest.127.6.2222

subject

Has Abstract

pub_date

2005-06-01 00:00:00

pages

2222-5

issue

6

eissn

0012-3692

issn

1931-3543

pii

S0012-3692(15)49829-0

journal_volume

127

pub_type

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