Carbon dioxide rebreathing in non-invasive ventilation. Analysis of masks, expiratory ports and ventilatory modes

https://doi.org/10.4081/monaldi.2008.388

Authors

  • D. Samolski | dsamolski@gmail.com Respiratory Dept. Hospital de la Santa Creu i Sant Pau, Barcelona, Spain.
  • N. Calaf Respiratory Dept. Hospital de la Santa Creu i Sant Pau, Barcelona, Spain.
  • R. Güell Respiratory Dept. Hospital de la Santa Creu i Sant Pau, Barcelona, Italy.
  • P. Casan Respiratory Dept. Hospital de la Santa Creu i Sant Pau, Barcelona, Spain.
  • A. Antón Respiratory Dept. Hospital de la Santa Creu i Sant Pau, Barcelona, Spain.

Abstract

Background and Aim. Carbon dioxide (CO2) rebreathing is a complication of non-invasive ventilation (NIV). Our objectives were to evaluate the ability of masks with exhaust vents (EV) to avoid rebreathing while using positive pressure (PP) NIV with different levels of expiratory pressure (EPAP). Concerning volume-cycled NIV, we aimed to determine whether cylindrical spacers located in the circuit generate rebreathing. Materials and methods. 5 healthy volunteers were evaluated. Bi-level PP was used with 3 nasal and 2 facial masks with and without EV. Spacers of increasing volume attached to nasal hermetic masks were evaluated with volume NIV. Inspired CO2 fraction was analyzed. Results. Rebreathing was zero with all nasal masks and EPAP levels. Using facial masks 1 volunteer showed rebreathing. There was no rebreathing while using all the spacers. Conclusions. In healthy volunteers, nasal and facial masks with EV prevent rebreathing. In addition, the use of spacers did not generate this undesirable phenomenon.

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Published
2016-01-26
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Original Articles
Keywords:
CO2 rebreathing, Nasal and facial masks, Expiratory devices, Pressure and volume-cycled ventilators
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How to Cite
Samolski, D., N. Calaf, R. Güell, P. Casan, and A. Antón. 2016. “Carbon Dioxide Rebreathing in Non-Invasive Ventilation. Analysis of Masks, Expiratory Ports and Ventilatory Modes”. Monaldi Archives for Chest Disease 69 (3). https://doi.org/10.4081/monaldi.2008.388.

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