Article (Scientific journals)
Time-varying respiratory system elastance: a physiological model for patients who are spontaneously breathing.
Chiew, Yeong Shiong; Pretty, Christopher; Docherty, Paul D. et al.
2015In PLoS ONE, 10 (1), p. 0114847
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Abstract :
[en] BACKGROUND: Respiratory mechanics models can aid in optimising patient-specific mechanical ventilation (MV), but the applications are limited to fully sedated MV patients who have little or no spontaneously breathing efforts. This research presents a time-varying elastance (Edrs) model that can be used in spontaneously breathing patients to determine their respiratory mechanics. METHODS: A time-varying respiratory elastance model is developed with a negative elastic component (Edemand), to describe the driving pressure generated during a patient initiated breathing cycle. Data from 22 patients who are partially mechanically ventilated using Pressure Support (PS) and Neurally Adjusted Ventilatory Assist (NAVA) are used to investigate the physiology relevance of the time-varying elastance model and its clinical potential. Edrs of every breathing cycle for each patient at different ventilation modes are presented for comparison. RESULTS: At the start of every breathing cycle initiated by patient, Edrs is < 0. This negativity is attributed from the Edemand due to a positive lung volume intake at through negative pressure in the lung compartment. The mapping of Edrs trajectories was able to give unique information to patients' breathing variability under different ventilation modes. The area under the curve of Edrs (AUCEdrs) for most patients is > 25 cmH2Os/l and thus can be used as an acute respiratory distress syndrome (ARDS) severity indicator. CONCLUSION: The Edrs model captures unique dynamic respiratory mechanics for spontaneously breathing patients with respiratory failure. The model is fully general and is applicable to both fully controlled and partially assisted MV modes.
Disciplines :
Anesthesia & intensive care
Author, co-author :
Chiew, Yeong Shiong
Pretty, Christopher
Docherty, Paul D.
LAMBERMONT, Bernard  ;  Centre Hospitalier Universitaire de Liège - CHU > Frais communs médecine
Shaw, Geoffrey M.
Desaive, Thomas  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Thermodynamique des phénomènes irréversibles
Chase, J. Geoffrey
Language :
English
Title :
Time-varying respiratory system elastance: a physiological model for patients who are spontaneously breathing.
Publication date :
2015
Journal title :
PLoS ONE
eISSN :
1932-6203
Publisher :
Public Library of Science, United States - California
Volume :
10
Issue :
1
Pages :
e0114847
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 01 March 2015

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