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Intensive Care Medicine
Published in: Intensive Care Medicine 11/2005

01-11-2005 | Technical Note

Comparison of two flow generators with a noninvasive ventilator to deliver continuous positive airway pressure: a test lung study

Authors: Carolina Fu, Pedro Caruso, Jeanette Janaina Jaber Lucatto, Guilherme Pinto de Paula Schettino, Rogério de Souza, Carlos Roberto Ribeiro Carvalho

Published in: Intensive Care Medicine | Issue 11/2005

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Abstract

Objective

To compare the performance of two continuous flow generators with a ventilator designed for noninvasive positive pressure ventilation (NPPV) to deliver continuous positive airway pressure (CPAP). The performance of flow generators using different oxygen pressure supplies was also compared.

Design and setting

Experimental study using a mechanical lung model in a university research laboratory.

Measurements

Two flow generators supplied at 100, 200, and 300 kPa and an NPPV ventilator were compared at CPAP of 5, 10, and 15 cmH2O in: (a) area under the adjusted CPAP level during inspiration, (b) capacity to attain the preset CPAP, and (c) tidal volume.

Results

The NPPV ventilator attained the preset CPAP better than flow generators, but its area under adjusted CPAP was similar to or higher than that of flow generators when these were adjusted to their better pressure supply. Both flow generators had better performance with an output flow around 100 l/min, which was achieved at 100 kPa with one flow generator and 300 with the other. Flow generators and the NPPV ventilator generated similar tidal volumes.

Conclusions

Flow generators performance showed large variations among different devices and oxygen pressure supplies. Adjusted to their better pressure supply, flow generators had a similar or better capacity to maintain the CPAP level, but the NPPV ventilator was more reliable to attain the preset CPAP. Flow generators could be an alternative to provide CPAP in low-income areas, usually with scarce medical equipment availability.
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Metadata
Title
Comparison of two flow generators with a noninvasive ventilator to deliver continuous positive airway pressure: a test lung study
Authors
Carolina Fu
Pedro Caruso
Jeanette Janaina Jaber Lucatto
Guilherme Pinto de Paula Schettino
Rogério de Souza
Carlos Roberto Ribeiro Carvalho
Publication date
01-11-2005
Publisher
Springer-Verlag
Published in
Intensive Care Medicine / Issue 11/2005
Print ISSN: 0342-4642
Electronic ISSN: 1432-1238
DOI
https://doi.org/10.1007/s00134-005-2795-x

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