• Kento Sato, Yoko Shibata, Sumito Inoue, Akira Igarashi, Yoshikane Tokairin, Keiko Yamauchi, Tomomi Kimura, Takako Nemoto, Masamichi Sato, Hiroshi Nakano, Hiroyoshi Machida, Michiko Nishiwaki, Maki Kobayashi, Sujeong Yang, Yukihiro Minegishi, Kodai Furuyama, Tomoka Yamamoto, Tetsu Watanabe, Tsuneo Konta, Yoshiyuki Ueno, Takeo Kato, Takamasa Kayama, and Isao Kubota.
• Department of Cardiology, Pulmonology, and Nephrology, Yamagata University School of Medicine, 2-2-2 Iida-Nishi, Yamagata 990-9585, Japan. Electronic address: k-sato@med.id.yamagata-u.ac.jp.
• Respir Investig. 2018 Mar 1; 56 (2): 120-127.

BackgroundFew studies are available regarding the annual decline of forced expiratory volume in 1s (FEV1) in chronic obstructive pulmonary disease patients with mild airflow obstruction. This study sought to clarify to what extent cigarette-smoking individuals with mild airflow obstruction lose pulmonary function annually.MethodsFrom 2004 to 2006, pulmonary function tests were performed on people >40 years of age, during the annual health checkup held in Takahata, Yamagata, Japan (initial study population, n=3253). In 2011, pulmonary function tests were performed again on participants who agreed to undergo reexamination (follow-up study population, n=838).ResultsSmokers have decreased pulmonary function in terms of percent forced vital capacity (FVC), %FEV1, and FEV1/FVC; the stages of airflow obstruction were also more severe in smokers than never-smokers. The annual decline in FEV1 was significantly greater in smokers than in never-smokers. The median annual decline in FEV1 was most significant in individuals with mild airflow obstruction. The annual decline in FEV1 was greater in smokers with mild airflow obstruction than in smokers with moderate airflow obstruction. In analyzing the decline in %FEV1, the annual change in smokers with mild airflow obstruction was greater than that in smokers with normal spirometric values.ConclusionThe annual decline in FEV1 was most significant in smokers with mild airflow obstruction in a Japanese general population. This highlights the importance of early detection of chronic obstructive pulmonary disease patients among the general population in order to prevent disease progression in undiagnosed patients.Copyright © 2017 The Japanese Respiratory Society. Published by Elsevier B.V. All rights reserved.

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