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Exhaled nitric oxide parameters and functional capacity in chronic obstructive pulmonary disease
Matthew R McCurdy1, Amir Sharafkhaneh, Hanan Abdel-Monem
1Rice Quantum Institute, Rice University, Houston, TX, USA.
Journal of Breath Research
|March 8, 2011
Summary
Investigational biomarkers like peripheral nitric oxide (NO) in COPD correlate with reduced functional capacity. Elevated airway NO also links to worse symptom scores in severe COPD patients.
Area of Science:
- Pulmonary Medicine
- Biomarker Research
- Respiratory Physiology
Background:
- Extended exhaled nitric oxide (eNO) parameters are emerging biomarkers for Chronic Obstructive Pulmonary Disease (COPD).
- Investigating the relationship between peripheral eNO and patient-reported outcomes is crucial for understanding COPD progression.
Purpose of the Study:
- To test the hypothesis that elevated peripheral eNO correlates with decreased functional capacity and lower global health status in severe COPD.
- To explore the association between various eNO parameters and objective measures of physical function and subjective health status.
Main Methods:
- Enrolled 27 subjects with Global Initiative for Chronic Obstructive Lung Disease (GOLD) stage 3 and 4 COPD.
- Assessed functional capacity using the 6-minute walk test (6MWT) and health status with the St. George's Respiratory Questionnaire (SGRQ).
- Measured eNO parameters (FE(NO)0.05, C(ANO), D(awNO), C(awNO), J'(awNO)) using multiple exhalation flow rates, corrected for axial diffusion.
Main Results:
- Peripheral nitric oxide (FE(NO)0.05) showed a significant correlation with the distance walked in the 6MWT (r = -0.59, p = 0.03).
- Maximum airway NO flux (J'(awNO)) correlated significantly with SGRQ symptom scores (r = -0.73, p = 0.01) and total scores (r = -0.56, p = 0.05).
Conclusions:
- Peripheral nitric oxide levels are associated with functional capacity in severe COPD patients.
- Airway nitric oxide parameters are linked to symptom burden and overall health status in this population.
- Extended eNO measurements show potential as valuable biomarkers in managing severe COPD.
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