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. 2020 Jul 28;24:467. doi: 10.1186/s13054-020-03169-x

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© The Author(s) 2020

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data.

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Fig. 2 — Classification of airway pressure waveform pattern during occlusion. Airway flow (in l/s) and airway pressure (Paw, in cmH₂O) waveforms representative of the three patterns of Paw during occlusion, from three different patients. The solid vertical line indicates the point of occlusion and subsequent dotted lines the points at 0.3, 1, and 2 s post-occlusion. Each pattern was characterized by the relationships among Paw at different time points relative to the occlusion: occlusion, 0 s (Paw_occ), 0.3 s (Paw_0.3s), 1 s (Paw_1s), and 2 s (Paw_2s). Upper panel: a “passive-like” pattern with a rapid decrease in Paw (Paw_occ > Paw_0.3s), followed by plateau (Paw_1s − Paw_0.3s < 1 and Paw_2s − Paw_1s < 1 cmH₂O). Middle panel: a “clear plateau” pattern with an early increase in Paw (Paw_occ < Paw_0.3s), followed by plateau (Paw_1s − Paw_0.3s < 1 and Paw_2s − Paw_1s < 1 cmH₂O). Lower panel: an “irregular rise” pattern with a slow increase in Paw (Paw_1s − Paw_0.3s > 1 cmH₂O) with plateau (Paw_2s − Paw_1s < 1 cmH₂O)