Diagnostic Accuracy of Bronchodilator Responsiveness in Wheezy Children

Overview

Journal Thorax

Date 2004 Dec 25

PMID 15618576

Citations 21

Authors

I Dundas

E Y Chan

P D Bridge

S A McKenzie

Affiliations

Soon will be listed here.

Abstract

Background: The aim of this study was to evaluate the diagnostic accuracy of bronchodilator responsiveness for asthma in 5-10 year old children.

Methods: Spirometric measurements were made in 142 children (58 wheezers) before and after 400 mug inhaled salbutamol.

Results: On a receiver operating characteristic curve, a 9% increase in predicted forced expiratory volume in 1 second was the cut off point that provided an acceptable balance of sensitivity and specificity for previous wheeze. This figure was 50% (95% CI 38 to 62) sensitive and 86% (95% CI 78 to 92) specific for detecting previous wheeze and multiplied the initial odds in favour of wheeze by a factor of 3.6 (95% CI 2.0 to 6.3).

Discussion: With an estimated pretest probability of wheeze of 10% in the community and 50% in a specialist clinic, the positive predictive values are 29% and 78%, respectively, for a 9% change. The value of bronchodilator responsiveness testing depends on the prevalence of wheeze in the population in which it is to be used.

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