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Intraoperative positive end-expiratory pressure evaluation using the intratidal compliance-volume profile  S. Wirth, M. Baur, J. Spaeth, J. Guttmann,

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Presentation on theme: "Intraoperative positive end-expiratory pressure evaluation using the intratidal compliance-volume profile  S. Wirth, M. Baur, J. Spaeth, J. Guttmann,"— Presentation transcript:

1 Intraoperative positive end-expiratory pressure evaluation using the intratidal compliance-volume profile  S. Wirth, M. Baur, J. Spaeth, J. Guttmann, S. Schumann  British Journal of Anaesthesia  Volume 114, Issue 3, Pages (March 2015) DOI: /bja/aeu385 Copyright © 2015 The Author(s) Terms and Conditions

2 Fig 1 Schematic drawing of six compliance profiles classified on the basis of intratidal compliance–volume curve. H, horizontal compliance profile; I, merely increasing compliance profile; IH, increasing turning into horizontal compliance profile; D, merely decreasing compliance profile; HD, horizontal turning into decreasing compliance profile; IHD, increasing turning into horizontal and further turning into decreasing compliance profile. British Journal of Anaesthesia  , DOI: ( /bja/aeu385) Copyright © 2015 The Author(s) Terms and Conditions

3 Fig 2 Relative compliance change during ongoing surgery (solid line). During surgery the compliance decreased continuously. Note that reasoned by variable surgery duration the number of patients included for a certain time point decreases with time (dotted line). During the first 60 min data from all 35 patients were available. After 120 min, data from 26 patients could be used and after 200 min only 11 patients contributed to the curve. British Journal of Anaesthesia  , DOI: ( /bja/aeu385) Copyright © 2015 The Author(s) Terms and Conditions

4 Fig 3 Exemplary respiratory signals representing a cutout from a 5 min measurement interval. (a) Airway pressure (green) and tracheal pressure (blue); (b) flow rate; (c) volume; (d) airway pressure–volume (green) and tracheal pressure–volume (blue) loops from 12 breaths; (e) intratidal volume-dependent compliance curve (blue curve) averaged from the 12 breaths shown in d, the surrounding green area shows the pointwise standard deviation. The presented compliance curve was classified to merely increasing compliance profile (pink box). British Journal of Anaesthesia  , DOI: ( /bja/aeu385) Copyright © 2015 The Author(s) Terms and Conditions

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