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Relationship between peripheral airway function and patient-reported outcomes in COPD: a cross-sectional study
Akane Haruna1, Toru Oga, Shigeo Muro
1Department of Respiratory Care and Sleep Control Medicine, Graduate School of Medicine, Kyoto University, Kyoto, Japan.
BMC Pulmonary Medicine
|March 9, 2010
Summary
Impulse oscillometry (IOS) peripheral airway measurements correlate with COPD patient health status and dyspnea. This non-invasive tool aids in assessing functional impairment and patient well-being.
Area of Science:
- Respiratory Medicine
- Pulmonary Function Testing
- Medical Device Technology
Background:
- Health status, dyspnea, and psychological well-being are key outcomes in Chronic Obstructive Pulmonary Disease (COPD).
- Spirometry's FEV1 shows limited correlation with these patient-reported outcomes in COPD.
- Impulse oscillometry (IOS) is emerging as a tool to assess lung resistance (R) and reactance (X) for pulmonary functional impairment.
Purpose of the Study:
- To investigate the relationship between IOS measurements and patient-reported outcomes in stable COPD outpatients.
- To compare the correlation of IOS parameters with health status, dyspnea, and psychological status against traditional spirometry and CT imaging.
- To determine if IOS indices of peripheral airway function are significant predictors of patient-reported outcomes.
Main Methods:
- Pulmonary function tests, IOS, high-resolution CT, St. George's Respiratory Questionnaire (SGRQ), MRC dyspnea scale, and HADS were administered to 65 COPD outpatients.
- IOS parameters included lung resistance at 5 Hz (R5) and 20 Hz (R20), and reactance at 5 Hz (X5).
- Peripheral airway resistance (R5-R20) and reactance (X5) were analyzed for their association with SGRQ, MRC, and HADS scores.
Main Results:
- Peripheral airway resistance (R5-R20) and reactance (X5) showed significant correlations with SGRQ and MRC scores.
- These IOS-derived correlations were stronger than those observed with other pulmonary function measurements, including R20 and CT imaging.
- Multiple regression analysis identified R5-R20 and X5 as the most significant predictors of SGRQ and MRC scores.
Conclusions:
- IOS measurements, particularly those reflecting peripheral airway function, are significantly associated with health status and dyspnea in COPD patients.
- IOS offers a simple, non-invasive method for assessing pulmonary functional impairment.
- IOS may serve as a valuable clinical tool for estimating patients' quality of life and well-being in addition to detecting lung function abnormalities.
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