Intensive Care Medicine

, Volume 31, Issue 11, pp 1587–1592

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

  • Carolina Fu
  • Pedro Caruso
  • Jeanette Janaina Jaber Lucatto
  • Guilherme Pinto de Paula Schettino
  • Rogério de Souza
  • Carlos Roberto Ribeiro Carvalho
Technical Note

DOI: 10.1007/s00134-005-2795-x

Cite this article as:
Fu, C., Caruso, P., Lucatto, J.J.J. et al. Intensive Care Med (2005) 31: 1587. doi:10.1007/s00134-005-2795-x

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.

Keywords

Continuous positive airway pressure Artificial respiration Mechanical ventilators Noninvasive ventilation Continuous flow 

Copyright information

© Springer-Verlag 2005

Authors and Affiliations

  • Carolina Fu
    • 1
  • Pedro Caruso
    • 2
    • 3
  • Jeanette Janaina Jaber Lucatto
    • 1
  • Guilherme Pinto de Paula Schettino
    • 2
  • Rogério de Souza
    • 2
  • Carlos Roberto Ribeiro Carvalho
    • 2
  1. 1.Physiotherapy, Phonology and Occupational Therapy Department, Medical SchoolUniversity of São PauloSão PauloBrazil
  2. 2.Pulmonary Division, Medical SchoolUniversity of São PauloSão PauloBrazil
  3. 3.Centro de Tratamento e PesquisaHospital do CâncerSão PauloBrazil