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Can bronchodilator response predict bronchial response to methacholine in preschool coughers?
Author(s) -
Beydon Nicole,
M'Buila Célestin,
Peiffer Claudine,
Bernard Agnès,
Zaccaria Isabelle,
Denjean André
Publication year - 2008
Publication title -
pediatric pulmonology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.866
H-Index - 106
eISSN - 1099-0496
pISSN - 8755-6863
DOI - 10.1002/ppul.20877
Subject(s) - bronchodilator , methacholine , medicine , bronchoconstriction , bronchodilation , anesthesia , bronchodilator agents , asthma , respiratory disease , lung
The aim of the present study was to determine the relationship between bronchodilator response, assessed by interrupter resistance (Rint), and bronchial reactivity in preschool children with chronic cough. Thirty‐eight children coughers (median age 5.0 years, range 2.8–6.4) were tested. Bronchodilator response was recorded within 4 months before methacholine challenge. Response to the latter was assessed using transcutaneous partial pressure of oxygen and Rint. Children were considered responders if a 20% fall in transcutaneous partial pressure of oxygen occurred during the bronchial challenge. Bronchodilator response was not different between responders (n = 24) and nonresponders (n = 14) [median (range) −0.11 (−0.44–0.09) vs. −0.08 (−0.21–0.10) kPa L −1 sec; respectively]. However, none of the nonresponders had a bronchodilator response larger than −0.21 kPa L −1 sec, this cutoff had a 100% positive and a 44% negative predictive value to predict a positive methacholine challenge. The relationship between bronchodilator response and bronchial methacholine responsiveness reached the limit of significance ( P = 0.048). Furthermore, the magnitude of the bronchodilator response was correlated to the level of methacholine‐induced level of bronchoconstriction ( P = 0.01), and to the postchallenge bronchodilation ( P = 0.04), all values expressed as % predicted. Moreover, the postbronchodilator Rint value obtained with preceding methacholine challenge was lower than the postbronchodilator value without preceding methacholine challenge in 71.4% (10/14) of the nonresponders and in only 33.3% (8/24) of the responders. Conclusions in preschool coughers bronchodilator response, assessed by the interrupter technique, was correlated to the bronchial responsiveness to methacholine. Non responders had a bronchodilator response not larger than −0.21 kPa L −1 sec. Pediatr Pulmonol. 2008; 43:815–821. © 2008 Wiley‐Liss, Inc.