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Impulse oscillometry, an aid or a substitute?

Egyptian Journal of Bronchology volume 13, pages 416–423 (2019)Cite this article

Abstract

Introduction

In the field of pulmonary medicine, respiratory mechanics and physiology are obviously affected by most pathological lesions and diseases, either primary disease or part of systemic ones. In the era of rheumatoid arthritis (RA), airway abnormality and interstitial lung pneumonia and/or fibrosis are the most common findings that face physicians during the disease course and affect morbidity, survival, and quality of life of patients with RA. Impulse oscillometry (IOS) is a noninvasive technique that needs minimal patient cooperation, which makes it suitable for any age including even children and can be performed by most patients.

Aim of the work

To describe the respiratory measures done by IOS in patients with RA and to correlate them with those measured by spirometry.

Patients and methods

A total of 60 patients with RA were recruited in this cross-sectional observational study. They were investigated via pulmonary function assessments, including spirometry and IOS, to measure forced vital capacity (FVC), forced expiratory volume in 1 s (FEV1), and FEV1/FVC, and maximal expiratory flow at 25% (MEF 25%)in addition to R5% of predicted, R20% of predicted, R5–20, X5, and area under the curve.

Results

IOS measures indicated increased airway resistance (R5%, R20%, and R5–20) with decreased lung reactance (X5). Moreover, a positive correlation between disease duration and X5, between X5 and area under the curve and each of FEV1%, FVC%, and MEF 25%, whereas a negative correlation between R5–20 and each of FEV1%, FVC%, and MEF 25%.

Conclusion

IOS is an easy and rapid maneuver that requires minimal patient cooperation. It can identify lung affection in those who have mild or even normal spirometric changes. It is just a good screening test in patients with RA to detect early pathophysiologic lung changes. However, it needs further investigations to clarify the mechanism of these changes.

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Author information

Authors and Affiliations

  1. Department of Chest, Faculty of Medicine, Tanta University, 31111, ElGharbyia, Tanta, Egypt

    Reham M. Elkolaly MD & Salwa A. Ganna

  2. Department of Physical Medicine, Rheumatology and Rehabilitation, Tanta University Hospitals, Tanta, Egypt

    Doaa W. Nada

  3. Department of Internal Medicine, Tanta University Hospitals, Tanta, Egypt

    Mohammed H. Elnaggar

Authors
  1. Reham M. Elkolaly MD
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  2. Salwa A. Ganna
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  3. Doaa W. Nada
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  4. Mohammed H. Elnaggar
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Correspondence to Reham M. Elkolaly MD.

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Elkolaly, R.M., Ganna, S.A., Nada, D.W. et al. Impulse oscillometry, an aid or a substitute?. Egypt J Bronchol 13, 416–423 (2019). https://doi.org/10.4103/ejb.ejb_98_18

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  • DOI: https://doi.org/10.4103/ejb.ejb_98_18

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