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Critical Care
Published in: Critical Care 2/2010

Open Access 01-04-2010 | Research

Regional lung aeration and ventilation during pressure support and biphasic positive airway pressure ventilation in experimental lung injury

Authors: Marcelo Gama de Abreu, Maximiliano Cuevas, Peter M Spieth, Alysson R Carvalho, Volker Hietschold, Christian Stroszczynski, Bärbel Wiedemann, Thea Koch, Paolo Pelosi, Edmund Koch

Published in: Critical Care | Issue 2/2010

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Abstract

Introduction

There is an increasing interest in biphasic positive airway pressure with spontaneous breathing (BIPAP+SBmean), which is a combination of time-cycled controlled breaths at two levels of continuous positive airway pressure (BIPAP+SBcontrolled) and non-assisted spontaneous breathing (BIPAP+SBspont), in the early phase of acute lung injury (ALI). However, pressure support ventilation (PSV) remains the most commonly used mode of assisted ventilation. To date, the effects of BIPAP+SBmean and PSV on regional lung aeration and ventilation during ALI are only poorly defined.

Methods

In 10 anesthetized juvenile pigs, ALI was induced by surfactant depletion. BIPAP+SBmean and PSV were performed in a random sequence (1 h each) at comparable mean airway pressures and minute volumes. Gas exchange, hemodynamics, and inspiratory effort were determined and dynamic computed tomography scans obtained. Aeration and ventilation were calculated in four zones along the ventral-dorsal axis at lung apex, hilum and base.

Results

Compared to PSV, BIPAP+SBmean resulted in: 1) lower mean tidal volume, comparable oxygenation and hemodynamics, and increased PaCO2 and inspiratory effort; 2) less nonaerated areas at end-expiration; 3) decreased tidal hyperaeration and re-aeration; 4) similar distributions of ventilation. During BIPAP+SBmean: i) BIPAP+SBspont had lower tidal volumes and higher rates than BIPAP+SBcontrolled; ii) BIPAP+SBspont and BIPAP+SBcontrolled had similar distributions of ventilation and aeration; iii) BIPAP+SBcontrolled resulted in increased tidal re-aeration and hyperareation, compared to PSV. BIPAP+SBspont showed an opposite pattern.

Conclusions

In this model of ALI, the reduction of tidal re-aeration and hyperaeration during BIPAP+SBmean compared to PSV is not due to decreased nonaerated areas at end-expiration or different distribution of ventilation, but to lower tidal volumes during BIPAP+SBspont. The ratio between spontaneous to controlled breaths seems to play a pivotal role in reducing tidal re-aeration and hyperaeration during BIPAP+SBmean.
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Metadata
Title
Regional lung aeration and ventilation during pressure support and biphasic positive airway pressure ventilation in experimental lung injury
Authors
Marcelo Gama de Abreu
Maximiliano Cuevas
Peter M Spieth
Alysson R Carvalho
Volker Hietschold
Christian Stroszczynski
Bärbel Wiedemann
Thea Koch
Paolo Pelosi
Edmund Koch
Publication date
01-04-2010
Publisher
BioMed Central
Published in
Critical Care / Issue 2/2010
Electronic ISSN: 1364-8535
DOI
https://doi.org/10.1186/cc8912

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