Tuberculosis and Respiratory Diseases

  • 제84권3호
  • /
  • Pages.182-187
  • /
  • 2021
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  • 1738-3536(pISSN)
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  • 2005-6184(eISSN)
대한결핵및호흡기학회 (The Korean Academy of Tuberculosis and Respiratory Diseases)
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Measurement of Fractional Exhaled Nitric Oxide in Adults: Comparison of Two Different Analyzers (NIOX VERO and NObreath)

  • Kang, Sung-Yoon (Division of Pulmonology and Allergy, Department of Internal Medicine, Gachon University Gil Medical Center) ;
  • Lee, Sang Min (Division of Pulmonology and Allergy, Department of Internal Medicine, Gachon University Gil Medical Center) ;
  • Lee, Sang Pyo (Division of Pulmonology and Allergy, Department of Internal Medicine, Gachon University Gil Medical Center)
  • 투고 : 2020.11.16
  • 심사 : 2021.03.10
  • 발행 : 2021.07.31
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초록

Background: Fractional exhaled nitric oxide (FeNO) is a non-invasive marker for eosinophilic airway inflammation and a good predictor of response to corticosteroids. There is a need for a reliable and accurate measurement method, as FeNO measurements have been widely used in clinical practice. Our study aimed to compare two FeNO analyzers and derive a conversion equation for FeNO measurements in adults. Methods: We included 99 participants who had chief complaints of chronic cough and difficulty in breathing. The participants underwent concurrent FeNO measurement using NIOX VERO (Circassia AB) and NObreath (Bedfont). We compared the values of the two devices and analyzed their correlation and agreement. We then formulated an equation to convert FeNO values measured by NObreath into those obtained by NIOX VERO. Results: The mean age of the participants was 51.2±17.1 years, with a female predominance (58.6%). Approximately 60% of the participants had asthma. The FeNO level measured by NIOX VERO (median, 27; interquartile range [IQR], 15-45) was significantly lower than that measured by NObreath (median, 38; IQR, 22-58; p<0.001). There was a strong positive correlation between the two devices (r=0.779, p<0.001). Additionally, Bland-Altman plots and intraclass correlation coefficient demonstrated a good agreement. Using linear regression, we derived the following conversion equation: natural log (Ln) (NObreath)=0.728×Ln (NIOX VERO)+1.244. Conclusion: The FeNO values of NIOX VERO and NObreath were in good agreement and had positive correlations. Our proposed conversion equation could help assess the accuracy of the two analyzers.

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과제정보

We would like to thank Mil Hwang, RN and Miji Lee, RN for their help and support in conducting study.

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