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. 2022 Apr 8;9(1):e001163. doi: 10.1136/bmjresp-2021-001163

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© Author(s) (or their employer(s)) 2022. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.

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Examples in a patient with IPF (A–C) and a healthy subject (D–F) of multifrequency (spectral) oscillometry (A,D) and intrabreath oscillometry at 10 Hz (B, C, E, F). Respiratory resistance (Rrs) and reactance (Xrs) values are indicated by closed and open circles, respectively. Fres denotes resonance frequency and AX denotes reactance area between 5 Hz and Fres. XeE and XeI, respectively, mark the end-expiratory and end-inspiratory reactance values; The solid arrows mark the beginning of inspiration and dotted arrows indicate beginning of expiration. IPF, idiopathic pulmonary fibrosis.