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Usefulness of Fractional Exhaled Nitric Oxide-Guided Treatment in Patients with asthma-Chronic Obstructive Pulmonary Disease Overlap

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Open Journal of Respiratory Diseases 2018年第1期8卷 1-12页

作者： Taisuke Akamatsu Toshihiro Shirai Yuko Tanaka Hirofumi Watanabe Yoshinari Endo Yukiko Shimoda Takahito Suzuki Rie Noguchi Mika Saigusa Akito Yamamoto Yuichiro Shishido Takefumi Akita Satoru Morita Kazuhiro Asada Department of Respiratory Medicine Shizuoka General Hospital Shizuoka Japan

Background: Some patients present clinical features of both asthma and chronic obstructive pulmonary disease (copd), which has led to the recent proposal of asthma-copd overlap (ACO) as a diagnosis. Fractional exhaled nitric oxide (FeNO) is a candidate biomarker to diagnose ACO. We assessed the effect of an add-on treatment with budesonide/formoterol (BUD/FM) combination in patients with ACO, which was diagnosed by FeNO. Methods: This was a prospective, single-arm, open-label, before and after comparison study. Subjects included 83 patients with copd who attended outpatient clinics for routine checkups at Shizuoka General Hospital between June and November 2016. All patients fulfilled the GOLD definition of copd and were receiving long-acting muscarinic antagonist (LAMA) or LAMA/long-acting β2 agonist (LABA) combinations. After an 8-week run-in period, BUD/FM was added to the patients with FeNO levels of ≥35 ppb, defined as having ACO. For patients receiving LAMA/LABA, BUD/FM was added after the discontinuation of LABA. The modified British Medical Research Council (mMRC) score, copd assessment test (CAT) score, spirometric indices, forced oscillation parameters, and FeNO were assessed before and after 8 weeks of BUD/ FM add-on treatment. Results: Twenty-four patients (28.9%) had FeNO levels ≥ 35 ppb, and 17 patients completed the study (mean age: 73 years and GOLD I/II/III/IV, 5/10/1/1). The mean CAT scores significantly improved (9.2 to 5.4, p = 0.015) and 10 patients (58.8%) showed ≥2 points improvement, a minimal clinically important difference. The mean FeNO levels significantly decreased from 63.0 to 34.3 ppb (p Conclusions: FeNO-guided treatment with BUD/FM improves symptoms in patients with ACO.

关键词： asthma-copd Overlap Budesonide/Formoterol Combination copd Assessment Test Fractional Exhaled Nitric Oxide

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