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. 2016 Jun 27;16:30. doi: 10.1186/s12871-016-0196-z

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© Nakstad et al. 2016

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. 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.

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Fig. 3 — Closed catheter suctioning. Model airway pressures (P_{PEAK MA} and P_{EEP MA}, panel a) and inspiratory/expiratory tidal volumes (panel b) detected by the ventilator (Vt_i / Vt_e) are shown during suctioning with closed catheters (14 Fr in 8 and 9 mm ID ETT and 12 Fr in 7 mm ID ETT). Data are from experiments in PCV (left) and VCV (right) with I:E ratio 1:2 and flowtrigger. Measurements with trigger settings P0, P-5, P-10, P-15 and P-20 cm H₂O are shown as ranges. The choice of trigger setting and suction level (12 combinations used in this experiment) did not affect measurements prior to suctioning; significant changes from catheter insertion are therefore shown accordingly. During suctioning, however, pressures and volumes were strongly influenced by high frequency ventilator trigging. The dynamics of such trigging depends on the choice of suction pressure and ventilator trigger sensitivity. Pressures and volumes measured during suction were therefore unique for each of the 12 permutations (thus not subject to statistical analysis)