PT - JOURNAL ARTICLE AU - Suzanne Boer AU - Persijn J. Honkoop AU - Rik J.B. Loijmans AU - Jiska B. Snoeck-Stroband AU - Willem J.J. Assendelft AU - Tjard R.J. Schermer AU - Jacob K. Sont TI - Personalised exhaled nitric oxygen fraction (<em>F</em><sub>ENO</sub>)-driven asthma management in primary care: a <em>F</em><sub>ENO</sub> subgroup analysis of the ACCURATE trial AID - 10.1183/23120541.00351-2019 DP - 2020 Jul 01 TA - ERJ Open Research PG - 00351-2019 VI - 6 IP - 3 4099 - http://openres.ersjournals.com/content/6/3/00351-2019.short 4100 - http://openres.ersjournals.com/content/6/3/00351-2019.full SO - erjor2020 Jul 01; 6 AB - Background The aim of this study was to identify patients who benefit most from exhaled nitric oxide fraction (FENO)-driven asthma management in primary care, based on prespecified subgroups with different levels of FENO.Methods We used data from 179 adults with asthma from a 12-month primary care randomised controlled trial with 3-monthly assessments of FENO, asthma control, medication usage, costs of medication, severe asthma exacerbations and quality of life. In the original study, patients were randomised to either a symptom-driven treatment strategy (controlled asthma (Ca) strategy) or a FENO+symptom-driven strategy (FCa). In both groups, patients were categorised by their baseline level of FENO as low (&lt;25 ppb), intermediate (25–50 ppb) and high (&gt;50 ppb). At 12 months, we compared, for each prespecified FENO subgroup, asthma control, asthma-related quality of life, medication usage, and costs of medication between the Ca and FCa strategy.Results We found a difference between the Ca and FCa strategy for the mean dosage of beclomethasone strategy of 223 µg (95% CI 6–439), p=0.04) and for the total costs of asthma medication a mean reduction of US$159 (95% CI US$33–285), p=0.03) in patients with a low baseline FENO level. No differences were found for asthma control, severe asthma exacerbations and asthma-related quality of life in patients with a low baseline FENO level. Furthermore, in patients with intermediate or high level of FENO, no differences were found.Conclusions In primary care, FENO-driven asthma management is effective in patients with a low FENO level, for whom it is possible to down-titrate medication, while preserving asthma control and quality of life.In primary care, FENO-driven asthma management is effective in patients with a low FENO, for whom it is possible to down-titrate medication while preserving asthma control and quality of life https://bit.ly/2wC25N7d