Respiratory mechanics measured by forced oscillation technique in rheumatoid arthritis-related pulmonary abnormalities: frequency-dependence, heterogeneity and effects of smoking
| Autor: | Hiromichi Aso, Satoru Ito, Shingo Iwano, Toshihisa Kojima, Yoshinori Hasegawa, Masashi Kondo, Akemi Uchida, Naoki Ishiguro, Risa Sokai |
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| Rok vydání: | 2016 |
| Předmět: |
Vital capacity
medicine.medical_specialty Pathology Interstitial lung disease Respiratory physiology Pulmonary function testing 03 medical and health sciences 0302 clinical medicine Forced Oscillation Technique Diffusing capacity Internal medicine Medicine 030212 general & internal medicine Rheumatoid arthritis Respiratory system Multidisciplinary Lung business.industry Research MostGraph Impedance medicine.disease Airway Forced oscillation technique medicine.anatomical_structure 030228 respiratory system Cardiology business |
| Zdroj: | SpringerPlus |
| ISSN: | 2193-1801 |
| DOI: | 10.1186/s40064-016-1952-8 |
| Popis: | Rheumatoid arthritis (RA)-related pulmonary disorders specifically airway abnormalities and interstitial pneumonia (IP) are important extra-articular manifestations. The forced oscillation technique (FOT) is a useful method to assess respiratory impedance, respiratory resistance (Rrs) and reactance (Xrs), at different oscillatory frequencies during tidal breathing. The aim of this study was to characterize the respiratory mechanics of patients with RA and to relate them to parameters of the pulmonary function test and findings of chest CT images. Respiratory impedance of RA patients (n = 69) was measured as a function of frequency from 4 to 36 Hz using the FOT device and compared with that of healthy subjects (n = 10). Data were retrospectively reviewed. Patients were female-dominant (60.9 %) and 95.7 % had abnormal CT findings including airway and parenchymal abnormalities. Thirty-seven of 69 patients (53.6 %) were smokers. Rrs was significantly frequency-dependent in RA patients but not in the healthy subjects. Xrs were significantly frequency-dependent in both RA and healthy groups. Rrs was significantly higher during an expiratory phase in both RA and healthy groups. Xrs was significantly lower (more negative) during an expiratory phase than that during an inspiratory phase in RA patients but not in healthy subjects. Xrs of the RA group was significantly more negative than that of the normal control. There was no difference in impedance parameters between the airway lesion dominant (n = 27) and IP dominant groups (n = 23) in the RA group. The impedance parameters of the RA group significantly correlated with most parameters of the pulmonary function test. In pulmonary function test results, % of the predicted value for forced expiratory flow from 25 to 75 % of forced vital capacity was significantly lower and % of the predicted value for diffusing capacity of the lung for carbon monoxide was higher in the airway lesion dominant group than those in the IP dominant group. Krebs von den Lungen-6, a serum indicator of IP, was significantly higher in the IP group than that in the airway lesion dominant group. Taken together, the impedance results reflect abnormalities in pulmonary functions and structures in patients with RA. Electronic supplementary material The online version of this article (doi:10.1186/s40064-016-1952-8) contains supplementary material, which is available to authorized users. |
| Databáze: | OpenAIRE |
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