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Updated: Mar 9, 2026

Employing the Forced Oscillation Technique for the Assessment of Respiratory Mechanics in Adults
Published on: February 9, 2022
Three-dimensional imaging forced oscillation technique to assess position-dependent airway obstruction in relapsing
Takahiro Kamada1, Isao Ito2, Yoshihiro Kanemitsu2
1Department of Respiratory Medicine, Kyoto University Hospital, Japan; Department of Respiratory Medicine, Kobe City Medical Center West Hospital, Japan.
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.
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