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Critical Care
Published in: Critical Care 1/2014

Open Access 01-02-2014 | Research

Lung protection during non-invasive synchronized assist versus volume control in rabbits

Authors: Lucia Mirabella, Giacomo Grasselli, Jack J Haitsma, Haibo Zhang, Arthur S Slutsky, Christer Sinderby, Jennifer Beck

Published in: Critical Care | Issue 1/2014

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Abstract

Introduction

Experimental work provides insight into potential lung protective strategies. The objective of this study was to evaluate markers of ventilator-induced lung injury after two different ventilation approaches: (1) a “conventional” lung-protective strategy (volume control (VC) with low tidal volume, positive end-expiratory pressure (PEEP) and paralysis), (2) a physiological approach with spontaneous breathing, permitting synchrony, variability and a liberated airway. For this, we used non-invasive Neurally Adjusted Ventilatory Assist (NIV-NAVA), with the hypothesis that liberation of upper airways and the ventilator’s integration with lung protective reflexes would be equally lung protective.

Methods

In this controlled and randomized in vivo laboratory study, 25 adult White New Zealand rabbits were studied, including five non-ventilated control animals. The twenty animals with aspiration-induced lung injury were randomized to ventilation with either VC (6 mL/kg, PEEP 5 cm H2O, and paralysis) or NIV-NAVA for six hours (PEEP = zero because of leaks). Markers of lung function, lung injury, vital signs and ventilator parameters were assessed.

Results

At the end of six hours of ventilation (n = 20), there were no significant differences between VC and NIV-NAVA for vital signs, PaO2/FiO2 ratio, lung wet-to-dry ratio and broncho-alveolar Interleukin 8 (Il-8). Plasma IL-8 was higher in VC (P <0.05). Lung injury score was lower for NIV-NAVA (P = 0.03). Dynamic lung compliance recovered after six hours in NIV-NAVA but not in VC (P <0.05). During VC, peak pressures increased from 9.2 ± 2.4 cm H2O (hour 1) to 12.3 ± 12.3 cm H2O (hour 6) (P <0.05). During NIV-NAVA, the tracheal end-expiratory pressure was similar to the end-expiratory pressure during VC. Two animals regurgitated during NIV-NAVA, without clinical consequences, and survived the protocol.

Conclusions

In experimental acute lung injury, NIV-NAVA is as lung-protective as VC 6 ml/kg with PEEP.
Appendix
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Metadata
Title
Lung protection during non-invasive synchronized assist versus volume control in rabbits
Authors
Lucia Mirabella
Giacomo Grasselli
Jack J Haitsma
Haibo Zhang
Arthur S Slutsky
Christer Sinderby
Jennifer Beck
Publication date
01-02-2014
Publisher
BioMed Central
Published in
Critical Care / Issue 1/2014
Electronic ISSN: 1364-8535
DOI
https://doi.org/10.1186/cc13706

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