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Forced Oscillation Technique As a Predictor for Loss of Control in Asthmatic Children

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Publisher Wolters Kluwer
Date 2020 Feb 27
PMID 32099825
Citations 4
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Abstract

Background: A reliable objective tool using as a predictor of asthma control status could assist asthma management.

Objective: To find the parameters of forced oscillation technique (FOT) as predictors for the future loss of asthma symptom control.

Methods: Children with well-controlled asthma symptom, aged 6-12 years, were recruited for a 12-week prospective study. FOT and spirometer measures and their bronchodilator response were evaluated at baseline. The level of asthma symptom control was evaluated according to Global Initiative for Asthma.

Results: Among 68 recruited children, 41 children (60.3%) maintain their asthma control between 2 visits (group C-C), and 27 children (39.7%) lost their asthma control on the follow-up visit (group C-LC). Baseline FOT parameters, including the values of respiratory resistance at 5 Hz (R5), respiratory resistance at 20 Hz (R20), respiratory reactance at 5 Hz, area of reactance, %predicted of R5 and percentage of bronchodilator response (%∆) of R5 and R20 were significantly different between C-C and C-LC groups. In contrast, only %∆ of forced vital capacity, forced expiratory volume in 1 second (FEV), and FEF (forced expiratory flow 25%-75%) were significantly different between groups. Multiple logistic regression analysis revealed that %predicted of R5, %∆R5, %predicted of FEV and %∆FEV were the predictive factors for predicting the future loss of asthma control. The following cutoff values demonstrated the best sensitivity and specificity for predicting loss of asthma control: %predicted of R5=91.28, %∆R5=21.2, %predicted of FEV=89.5, and %∆FEV=7.8. The combination of these parameters predicted the risk of loss of asthma control with area under the curve of 0.924, accuracy of 83.8%.

Conclusion: Resistance FOT measures have an additive role to spirometric parameter in predicting future loss of asthma control.

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