Angle beta combined with FeNO and FEV1/FVC for the detection of asthma in school-aged children

摘要

Objective: The diagnostic value of angle beta in school-aged children with asthma is unknown. We speculate that angle beta may reflect diversification of the forced expiratory flow (FEF) to some extent. The objective of this study was to assess the diagnostic accuracy of angle beta, FeNO, pulmonary function parameters and their combinations for asthma in school-aged children. Methods: In total, 248 children participated in this study (140 children with asthma and 108 healthy children). The diagnostic performance of angle beta, FeNO and pulmonary function parameters was determined using receiver operating characteristic (ROC) curves. In the ROC analysis, we used the hold out cross-validation method to avoid overfitting. This study was performed in China and followed the Guidelines for the diagnosis and optimal management of asthma in children (China). Results: 1) In the asthma group, the mean angle beta value was significantly smaller than that in the control group (P < 0.001), but the mean FeNO value was significantly higher than that in the control group (P < 0.001). 2) More acute exacerbation or greater severity corresponded to a smaller angle beta. 3) Among the single indices, the area under the ROC curve of angle beta was the largest (except for FEV1/FVC). For combined indicators, after cross-verification, the combination of angle beta, FEV1/FVC and FeNO showed the highest diagnostic accuracy. Conclusion: Angle beta combined with FeNO and FEV1/FVC can improve the diagnostic accuracy for asthma in school-aged children.