title: Three-dimensional imaging forced oscillation technique to assess position-dependent airway obstruction in relapsing polychondritis: A case report.
abstract: Relapsing polychondritis (RP) is characterized by recurrent systemic inflammation of the cartilages and is accompanied by central airway collapse. We report a case wherein three-dimensional imaging of respiratory system resistance (Rrs) and respiratory system reactance (Xrs) by using MostGraph (CHEST M.I., Tokyo, Japan), a forced oscillation system, revealed that Rrs and Xrs in the inspiratory and expiratory phases correlated with proximal airway collapse. The degree of difference in Rrs and Xrs between the supine and sitting positions reflected airway collapse more closely than did the pulmonary function test. MostGraph could be a useful tool for assessing airway collapse in RP.
authors.affiliation: Department of Respiratory Medicine, Kyoto University Hospital, Japan; Department of Respiratory Medicine, Kobe City Medical Center West Hospital, Japan. Electronic address: takahiro00920619@gmail.com.
authors.forename: Takahiro
authors.initials: T
authors.lastname: Kamada
authors.affiliation: Department of Respiratory Medicine, Kyoto University Hospital, Japan. Electronic address: isaoito@kuhp.kyoto-u.ac.jp.
authors.forename: Isao
authors.initials: I
authors.lastname: Ito
authors.affiliation: Department of Respiratory Medicine, Kyoto University Hospital, Japan. Electronic address: kaney32@med.nagoya-cu.ac.jp.
authors.forename: Yoshihiro
authors.initials: Y
authors.lastname: Kanemitsu
authors.affiliation: Department of Respiratory Medicine, Kyoto University Hospital, Japan. Electronic address: ssato@kuhp.kyoto-u.ac.jp.
authors.forename: Susumu
authors.initials: S
authors.lastname: Sato
authors.affiliation: Department of Respiratory Medicine, Kyoto University Hospital, Japan. Electronic address: hmatsumo@kuhp.kyoto-u.ac.jp.
authors.forename: Hisako
authors.initials: H
authors.lastname: Matsumoto
authors.affiliation: Department of Respiratory Medicine, Kyoto University Hospital, Japan; Department of Respiratory Medicine, Allergy and Clinical Immunology, Nagoya City University Graduate School of Medical Sciences, Japan. Electronic address: a.niimi@med.nagoya-cu.ac.jp.
authors.forename: Akio
authors.initials: A
authors.lastname: Niimi
authors.affiliation: Department of Respiratory Medicine, Kyoto University Hospital, Japan. Electronic address: mishima@kuhp.kyoto-u.ac.jp.
authors.forename: Michiaki
authors.initials: M
authors.lastname: Mishima
mesh_terms: D000368:Aged; D000402:Airway Obstruction / Q000000981:diagnostic imaging* / Q000209:etiology / Q000503:physiopathology; D000403:Airway Resistance; D006801:Humans; D021621:Imaging, Three-Dimensional; D008297:Male; D009991:Oscillometry / Q000379:methods*; D011081:Polychondritis, Relapsing / Q000150:complications / Q000000981:diagnostic imaging*; D012137:Respiratory System / Q000000981:diagnostic imaging*
keywords: MostGraph; Pulmonary function test; Relapsing polychondritis; Respiratory system reactance; Respiratory system resistance