Repeatability of Exhaled Nitric Oxide Measurements in COPD Patients
Author Information
Author(s): Annamari Rouhos, Annette Kainu, Päivi Piirilä, Seppo Sarna, Ari Lindqvist, Jouko Karjalainen, Anssi R A Sovijärvi
Primary Institution: Helsinki University Central Hospital
Hypothesis
The study aims to assess the short-term repeatability of FENO measurement in subjects with moderate to very severe chronic obstructive pulmonary disease compared to that in healthy subjects.
Conclusion
The short-term repeatability of FENO measurement in patients with moderate to very severe COPD is equally good as in healthy subjects.
Supporting Evidence
- The coefficient of variation for 24-hour measurements was 12.4% in COPD patients.
- A change in FENO exceeding 24% is likely to reflect a minimum measurable change in COPD.
- FENO levels in COPD patients varied from low to elevated, reflecting disease heterogeneity.
Takeaway
This study looked at how consistently we can measure a specific gas in the breath of people with lung problems and found that it's just as reliable in them as in healthy people.
Methodology
FENO was measured three times in both COPD patients and healthy subjects at baseline, 10 minutes, and 24 hours after baseline, with spirometry performed on the first study day.
Potential Biases
The groups studied were not age- or gender-matched, which may introduce bias.
Limitations
The study included only stable COPD patients and did not compare FENO levels between groups due to age and gender mismatches.
Participant Demographics
20 patients with stable COPD and 20 healthy subjects, with COPD patients having a mean age of 65 years and healthy subjects a mean age of 41 years.
Statistical Information
P-Value
0.002
Confidence Interval
95% CI
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
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