Airway hyperresponsiveness to methacholine in 7-year-old children: sensitivity and specificity for pediatric allergist-diagnosed asthma
| Autor: | Allan B. Becker, Helen Dimich-Ward, Anne DyBuncio, Alexander C. Ferguson, Moira Chan-Yeung, Christopher Carlsten |
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| Rok vydání: | 2010 |
| Předmět: |
Male
Pulmonary and Respiratory Medicine Pediatrics medicine.medical_specialty Sensitivity and Specificity Bronchial Provocation Tests Bronchoconstrictor Agents Cohort Studies immune system diseases medicine Humans Child Methacholine Chloride Asthma Receiver operating characteristic business.industry Respiratory disease medicine.disease respiratory tract diseases El Niño Pediatrics Perinatology and Child Health Cohort Female Methacholine Bronchial Hyperreactivity Airway business Sensitivity (electronics) medicine.drug |
| Zdroj: | Pediatric Pulmonology. 46:175-178 |
| ISSN: | 8755-6863 |
| DOI: | 10.1002/ppul.21347 |
| Popis: | Background: The operating characteristics of PC20 values used as cut-offs to define airway hyperresponsiveness, as it informs the diagnosis of asthma in children, are poorly understood. We examine data from a unique cohort to inform this concern. Objective: Determine the sensitivity and specificity of incremental PC20 cut-offs for allergist-diagnosed asthma. Methods: Airway reactivity at age 7 was assessed in children within a birth cohort at high risk for asthma; PC20 for methacholine was determined by standard technique including interpolation. The diagnosis of asthma was considered by the pediatric allergist without knowledge of the methacholine challenge results. Sensitivity and specificity were calculated using a cross-tabulation of asthma diagnosis with incremental PC20 cut-off values, from 1.0 to 8.0 mg/ml, and plotted as receiver operator characteristic (ROC) curves. The “optimal” cut-off was defined as that PC20 conferring maximal value for sensitivity plus specificity while the “balanced” cut-off was defined as that PC20 at which sensitivity and specificity were most equal. Results: 70/348 children (20.1%) were diagnosed with asthma. The optimal and balanced PC20 cut-offs, both for all children and for females alone, were respectively 3 mg/ml (sensitivity 80.0%, specificity 49.1%) and 2 mg/ml (sensitivity 63.1%, specificity 64.7%). For males alone, the “optimal” and “balanced” PC20 cut-offs were both 2 mg/ml. Conclusion: For this cohort of 7-year olds at high risk for asthma, methacholine challenge testing using a cut-off value of PC20 3 mg/ml conferred the maximal sum of specificity plus sensitivity. For contexts in which higher sensitivity or specificity is desired, other cut-offs may be preferred. Pediatr. Pulmonol. 2011; 46:175–178. © 2011 Wiley-Liss, Inc. |
| Databáze: | OpenAIRE |
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