Reference values for methacholine reactivity (SAPALDIA study)

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Serval ID
serval:BIB_B07560AE325C
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Reference values for methacholine reactivity (SAPALDIA study)
Journal
Respiratory Research
Author(s)
Jayet  P. Y., Schindler  C., Kunzli  N., Zellweger  J. P., Brandli  O., Perruchoud  A. P., Keller  R., Schwartz  J., Ackermann-Liebrich  U., Leuenberger  P.
ISSN
1465-993X (Electronic)
Publication state
Published
Issued date
2005
Volume
6
Pages
131
Notes
Journal Article
Research Support, Non-U.S. Gov't
Abstract
BACKGROUND: The distribution of airway responsiveness in a general population of non-smokers without respiratory symptoms has not been established, limiting its use in clinical and epidemiological practice. We derived reference equations depending on individual characteristics (i.e., sex, age, baseline lung function) for relevant percentiles of the methacholine two-point dose-response slope. METHODS: In a reference sample of 1567 adults of the SAPALDIA cross-sectional survey (1991), defined by excluding subjects with respiratory conditions, responsiveness during methacholine challenge was quantified by calculating the two-point dose-response slope (O'Connor). Weighted L1-regression was used to estimate reference equations for the 95th , 90th , 75th and 50th percentiles of the two-point slope. RESULTS: Reference equations for the 95th , 90th , 75th and 50th percentiles of the two-point slope were estimated using a model of the form a + b* Age + c* FEV1 + d* (FEV1)2 , where FEV1 corresponds to the pre-test (or baseline) level of FEV1. For the central half of the FEV1 distribution, we used a quadratic model to describe the dependence of methacholine slope on baseline FEV1. For the first and last quartiles of FEV1, a linear relation with FEV1 was assumed (i.e., d was set to 0). Sex was not a predictor term in this model. A negative linear association with slope was found for age. We provide an Excel file allowing calculation of the percentile of methacholine slope of a subject after introducing age--pre-test FEV1--and results of methacholine challenge of the subject. CONCLUSION: The present study provides equations for four relevant percentiles of methacholine two-point slope depending on age and baseline FEV1 as basic predictors in an adult reference population of non-obstructive and non-atopic persons. These equations may help clinicians and epidemiologists to better characterize individual or population airway responsiveness.
Keywords
Age Distribution Algorithms Bronchial Provocation Tests/methods/*standards Diagnosis, Computer-Assisted/*methods/*standards Humans Methacholine Chloride/*diagnostic use *Reference Values Reproducibility of Results Respiratory Hypersensitivity/*diagnosis/*epidemiology Sensitivity and Specificity Sex Distribution Switzerland/epidemiology
Pubmed
Web of science
Open Access
Yes
Create date
25/01/2008 9:50
Last modification date
20/08/2019 15:19
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