Defining the normal range of fractional exhaled nitric oxide in children: one size does not fit all
Background The normal range of fractional exhaled nitric oxide (FENO) is influenced by demographic factors. However, single, fixed cut-off values are used for clinical interpretation in children despite rapid growth. We aimed to define the normal range of FENO during childhood and evaluate its utili...
| Main Authors: | , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
European Respiratory Society
2022-09-01
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| Series: | ERJ Open Research |
| Online Access: | http://openres.ersjournals.com/content/8/3/00319-2022.full |
| _version_ | 1797809430246457344 |
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| author | Ran Wang Stephen J. Fowler Stephen W. Turner Sarah Drake Laura Healy Lesley Lowe Hannah Wardman Miriam Bennett Adnan Custovic Angela Simpson Clare S. Murray |
| author_facet | Ran Wang Stephen J. Fowler Stephen W. Turner Sarah Drake Laura Healy Lesley Lowe Hannah Wardman Miriam Bennett Adnan Custovic Angela Simpson Clare S. Murray |
| author_sort | Ran Wang |
| collection | DOAJ |
| description | Background
The normal range of fractional exhaled nitric oxide (FENO) is influenced by demographic factors. However, single, fixed cut-off values are used for clinical interpretation in children despite rapid growth. We aimed to define the normal range of FENO during childhood and evaluate its utility in a diagnostic setting.
Method
FENO percentile charts were developed using data from nonasthmatic children in a population-based birth cohort (Manchester Asthma and Allergy Study). Children were skin prick tested, FENO measured at the ages of 8, 11, 13–16 and 18 years and clinical information collected. This chart was externally validated in the Study of Eczema and Asthma to Observe the Influence of Nutrition (SEATON) cohort before being prospectively tested in symptomatic, treatment-naïve patients with suspected asthma in a diagnostic setting (Rapid Access Diagnostics for Asthma study).
Results
Height, weight, body mass index and age were predictive of FENO in univariate analysis using 1220 FENO measurements. Only height remained significant after adjustment in the overall, nonatopic and atopic populations, and was included in the predictive equations for 50th, 75th 90th and 98th percentiles. The proposed percentile lines corresponded to the 57th (95% CI 53rd–61st), 80th (76th–83rd), 90th (87th–92nd) and 98th (96th–99th) percentiles in the SEATON cohort (660 measurements). When tested in 73 symptomatic treatment-naïve children and young adults (median (interquartile range) age: 11 (8–14) years), an FENO >90th percentile gave a 96% specificity and positive predictive value of 97%, identifying 59% of children who were subsequently diagnosed with asthma after extensive testing.
Conclusion
We developed a height-based FENO percentile chart which quantifies the probability of asthma in symptomatic children and merits further validation towards clinical implementation. |
| first_indexed | 2024-03-13T06:52:37Z |
| format | Article |
| id | doaj.art-56be834080a644ef9c1cf967cea06563 |
| institution | Directory Open Access Journal |
| issn | 2312-0541 |
| language | English |
| last_indexed | 2024-03-13T06:52:37Z |
| publishDate | 2022-09-01 |
| publisher | European Respiratory Society |
| record_format | Article |
| series | ERJ Open Research |
| spelling | doaj.art-56be834080a644ef9c1cf967cea065632023-06-07T13:30:19ZengEuropean Respiratory SocietyERJ Open Research2312-05412022-09-018310.1183/23120541.00319-202200319-2022Defining the normal range of fractional exhaled nitric oxide in children: one size does not fit allRan Wang0Stephen J. Fowler1Stephen W. Turner2Sarah Drake3Laura Healy4Lesley Lowe5Hannah Wardman6Miriam Bennett7Adnan Custovic8Angela Simpson9Clare S. Murray10 Division of Immunology, Immunity to infection & Respiratory Medicine, School of Biological Sciences, The University of Manchester. Manchester Academic Health Science Centre, Manchester, UK Division of Immunology, Immunity to infection & Respiratory Medicine, School of Biological Sciences, The University of Manchester. Manchester Academic Health Science Centre, Manchester, UK Women and Children's Division, NHS Grampian, Aberdeen, UK Division of Immunology, Immunity to infection & Respiratory Medicine, School of Biological Sciences, The University of Manchester. Manchester Academic Health Science Centre, Manchester, UK Division of Immunology, Immunity to infection & Respiratory Medicine, School of Biological Sciences, The University of Manchester. Manchester Academic Health Science Centre, Manchester, UK Division of Immunology, Immunity to infection & Respiratory Medicine, School of Biological Sciences, The University of Manchester. Manchester Academic Health Science Centre, Manchester, UK University of Manchester, Centre for Primary Care and Health Services Research, Manchester, UK Division of Immunology, Immunity to infection & Respiratory Medicine, School of Biological Sciences, The University of Manchester. Manchester Academic Health Science Centre, Manchester, UK Faculty of Medicine, National Heart & Lung Institute, Imperial College London, London, UK Division of Immunology, Immunity to infection & Respiratory Medicine, School of Biological Sciences, The University of Manchester. Manchester Academic Health Science Centre, Manchester, UK Division of Immunology, Immunity to infection & Respiratory Medicine, School of Biological Sciences, The University of Manchester. Manchester Academic Health Science Centre, Manchester, UK Background The normal range of fractional exhaled nitric oxide (FENO) is influenced by demographic factors. However, single, fixed cut-off values are used for clinical interpretation in children despite rapid growth. We aimed to define the normal range of FENO during childhood and evaluate its utility in a diagnostic setting. Method FENO percentile charts were developed using data from nonasthmatic children in a population-based birth cohort (Manchester Asthma and Allergy Study). Children were skin prick tested, FENO measured at the ages of 8, 11, 13–16 and 18 years and clinical information collected. This chart was externally validated in the Study of Eczema and Asthma to Observe the Influence of Nutrition (SEATON) cohort before being prospectively tested in symptomatic, treatment-naïve patients with suspected asthma in a diagnostic setting (Rapid Access Diagnostics for Asthma study). Results Height, weight, body mass index and age were predictive of FENO in univariate analysis using 1220 FENO measurements. Only height remained significant after adjustment in the overall, nonatopic and atopic populations, and was included in the predictive equations for 50th, 75th 90th and 98th percentiles. The proposed percentile lines corresponded to the 57th (95% CI 53rd–61st), 80th (76th–83rd), 90th (87th–92nd) and 98th (96th–99th) percentiles in the SEATON cohort (660 measurements). When tested in 73 symptomatic treatment-naïve children and young adults (median (interquartile range) age: 11 (8–14) years), an FENO >90th percentile gave a 96% specificity and positive predictive value of 97%, identifying 59% of children who were subsequently diagnosed with asthma after extensive testing. Conclusion We developed a height-based FENO percentile chart which quantifies the probability of asthma in symptomatic children and merits further validation towards clinical implementation.http://openres.ersjournals.com/content/8/3/00319-2022.full |
| spellingShingle | Ran Wang Stephen J. Fowler Stephen W. Turner Sarah Drake Laura Healy Lesley Lowe Hannah Wardman Miriam Bennett Adnan Custovic Angela Simpson Clare S. Murray Defining the normal range of fractional exhaled nitric oxide in children: one size does not fit all ERJ Open Research |
| title | Defining the normal range of fractional exhaled nitric oxide in children: one size does not fit all |
| title_full | Defining the normal range of fractional exhaled nitric oxide in children: one size does not fit all |
| title_fullStr | Defining the normal range of fractional exhaled nitric oxide in children: one size does not fit all |
| title_full_unstemmed | Defining the normal range of fractional exhaled nitric oxide in children: one size does not fit all |
| title_short | Defining the normal range of fractional exhaled nitric oxide in children: one size does not fit all |
| title_sort | defining the normal range of fractional exhaled nitric oxide in children one size does not fit all |
| url | http://openres.ersjournals.com/content/8/3/00319-2022.full |
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