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[Comparison of exhaled nitric oxide levels measured by two offline methods and the NO breath® method in Japan]. 2014

Jun Ito, and Takahiro Tsuburai, and Ryo Atsuta, and Kentaro Watai, and Masanori Fukuhara, and Hiroaki Hayashi, and Takafumi Minami, and Hidenori Tanimoto, and Chiyako Oshikata, and Kiyoshi Sekiya, and Naomi Tsurikizawa, and Yuma Fukutomi, and Norihiro Harada, and Yuji Maeda, and Akio Mori, and Maki Hasegawa, and Masami Taniguchi, and Kazuhisa Takahashi, and Kazuo Akiyama
Clinical Research Center for Allergy and Rheumatology, National Hospital Organization, Sagamihara National Hospital; Department of Respiratory Medicine, Juntendo University School of Medicine, Tokyo, Japan.

BACKGROUND The fraction of exhaled nitric oxide (FeNO) is a useful marker of eosinophilic airway inflammation in asthmatics. Clinical application of FeNO measurement in Japan is expected increase because the procedure is now covered through health insurance. However, the measurement system used is known to affect FeNO results, and it remains unknown whether results from offline methods correlate with those from traditional online methods, such as NO breath®. METHODS The study population comprised 48 patients at our hospital. FeNO levels were measured by using two offline methods (Sievers and CEIS) and a standard online method, NO breath® RESULTS FeNONO breath levels were significantly correlated with FeNOSievers(r=0.875) and FeNOCEIS(r=0.888) levels. FeNONO breath levels were nearly equal to FeNOSievers results (FeNONO breath=1.05×FeNOSievers), but both of these levels were lower (p=0.02) than FeNOCEIS data (FeNONO breath=0.74×FeNOCEIS). A Bland-Altman plot of values obtained by the NO breath® and Sievers methods revealed that the NO breath® result was lower than the Sievers level when FeNO was low but was higher than the Sievers level when FeNO was high. CONCLUSIONS Differences exist in the levels of FeNO measurement by three methods (two offline methods and NO breath®): conversion equations are needed to compare the FeNO levels obtained by using these three methods. In addition, NO breath® may be more useful to distinguish asthmatic patients from non-asthmatics, compared with Sievers method.

UI MeSH Term Description Entries
D007564 Japan A country in eastern Asia, island chain between the North Pacific Ocean and the Sea of Japan, east of the Korean Peninsula. The capital is Tokyo. Bonin Islands
D008297 Male Males
D008875 Middle Aged An adult aged 45 - 64 years. Middle Age
D009569 Nitric Oxide A free radical gas produced endogenously by a variety of mammalian cells, synthesized from ARGININE by NITRIC OXIDE SYNTHASE. Nitric oxide is one of the ENDOTHELIUM-DEPENDENT RELAXING FACTORS released by the vascular endothelium and mediates VASODILATION. It also inhibits platelet aggregation, induces disaggregation of aggregated platelets, and inhibits platelet adhesion to the vascular endothelium. Nitric oxide activates cytosolic GUANYLATE CYCLASE and thus elevates intracellular levels of CYCLIC GMP. Endogenous Nitrate Vasodilator,Mononitrogen Monoxide,Nitric Oxide, Endothelium-Derived,Nitrogen Monoxide,Endothelium-Derived Nitric Oxide,Monoxide, Mononitrogen,Monoxide, Nitrogen,Nitrate Vasodilator, Endogenous,Nitric Oxide, Endothelium Derived,Oxide, Nitric,Vasodilator, Endogenous Nitrate
D001944 Breath Tests Any tests done on exhaled air. Breathalyzer Tests,Breath Test,Breathalyzer Test,Test, Breath,Test, Breathalyzer,Tests, Breath,Tests, Breathalyzer
D005260 Female Females
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D001249 Asthma A form of bronchial disorder with three distinct components: airway hyper-responsiveness (RESPIRATORY HYPERSENSITIVITY), airway INFLAMMATION, and intermittent AIRWAY OBSTRUCTION. It is characterized by spasmodic contraction of airway smooth muscle, WHEEZING, and dyspnea (DYSPNEA, PAROXYSMAL). Asthma, Bronchial,Bronchial Asthma,Asthmas
D045853 Exhalation The act of BREATHING out. Exhaling,Expiration, Respiratory,Exhalations,Expirations, Respiratory,Respiratory Expiration,Respiratory Expirations

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