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. 2025 Apr 25:18:637-647.
doi: 10.2147/JAA.S516257. eCollection 2025.

Detection of Inadequately Controlled Asthma in Adults Using Impulse Oscillometry and Fractional Exhaled Nitric Oxide

Xuwen Yang #  1 , Meishan Liu #  1 , Honglei Shi  1 , Mengjia Hu  1 , Yong Lu  1 , Xiaohong Chang  1 , Kewu Huang  1
Affiliations

Detection of Inadequately Controlled Asthma in Adults Using Impulse Oscillometry and Fractional Exhaled Nitric Oxide

Xuwen Yang et al. J Asthma Allergy. .

Abstract

Purpose: To investigate the effectiveness of impulse oscillometry (IOS) and its combination with fractional expiratory nitric oxide (FeNO) in distinguishing inadequately controlled asthma (ICA) from well-controlled asthma (WCA) in adults.

Patients and methods: Adult patients aged 18 and above with asthma were recruited and underwent routine blood tests, FeNO, IOS, and spirometry before and after bronchodilator administration on the same day. Asthma control level was assessed using Asthma Control Test (ACT) scores; WCA was defined as a score above 20, while ICA was defined as a score of 20 or below. Receiver operating characteristic curve (ROC) and logistic regression analyses were employed to determine the relationship between IOS and FeNO measurements and asthma control.

Results: The z score values of IOS parameters, specifically resistance at 5 hz (R5), resistance at 20 hz (R20), and the area under reactance curve between 5 hz and resonant frequency (AX) after bronchodilator administration were significantly different between the WCA (n = 75) and ICA (n = 77) groups. IOS parameters, R5, R20, and AX, after bronchodilation identified patients with ICA, with areas under receiver operating characteristic curve (AUC) of 0.654, 0.690, and 0.708, respectively, adjusted for smoke exposure, variable airflow limitation and fixed airflow obstruction. Combining IOS parameters with FeNO significantly increased the AUC (0.728, 0.752, and 0.763) for detecting ICA compared to IOS parameters with R5, R20, and AX, alone. Patients with abnormal IOS and FeNO values had significantly higher odds ratio (OR) of having ICA by logistic regression analyses, especially for abnormally higher AX, with an OR of 6.48.

Conclusion: IOS is useful in discriminating ICA from WCA in adults, with its effectiveness further enhanced when combined with FeNO measurements.

Keywords: Asthma; Fractional exhaled nitric oxide; Impulse oscillometry; Spirometry.

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Conflict of interest statement

The authors report no conflicts of interest in this work.

Figures

Figure 1
Figure 1
Study design and flow diagram.
Figure 2
Figure 2
ROC curve analysis for the z score of R5 (A), R20 (B), and AX (C) after bronchodilator administration and the combinations of (A–C) with FeNO as continuous variables. Covariates include smoke exposure, variable airflow limitation and fixed airflow obstruction.
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References

    1. Mortimer K, Lesosky M, García-Marcos L, et al. The burden of asthma, hay fever and eczema in adults in 17 countries: gan Phase I study. Eur Respir J. 2022;60(3):2102865. doi:10.1183/13993003.02865-2021 - DOI - PMC - PubMed
    1. Barnes PJ, Szefler SJ, Reddel HK, Chipps BE. Symptoms and perception of airway obstruction in asthmatic patients: clinical implications for use of reliever medications. J Allergy Clin Immunol. 2019;144(5):1180–1186. doi:10.1016/j.jaci.2019.06.040 - DOI - PubMed
    1. Banzett RB, Dempsey JA, O’Donnell DE, Wamboldt MZ. Symptom perception and respiratory sensation in asthma. Am J Respir Crit Care Med. 2000;162(3 Pt 1):1178–1182. doi:10.1164/ajrccm.162.3.9909112 - DOI - PubMed
    1. Olaguibel JM, Quirce S, Juliá B, et al. Measurement of asthma control according to global initiative for asthma guidelines: a comparison with the asthma control questionnaire. Respir Res. 2012;13(1):50. doi:10.1186/1465-9921-13-50 - DOI - PMC - PubMed
    1. Global initiative for asthma. Global strategy for asthma management and prevention. 2024. Available from: www.ginasthma.org. Accessed May 22, 2024.

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