Performances of CPAP Devices With an Oronasal Mask.

BACKGROUND

The aim of this bench study was to investigate the performances of 8 devices for noninvasive CPAP.

METHODS

Eight devices for noninvasive CPAP with an orofacial mask were studied: Ventumask, Ventumask 30, EasyVent, EasyVent Emergency, Compact Model II, Flowone, Superflow, Boussignac CPAP valve. Each device was tested at oxygen input flows from 5 to 20 L/min, and the output gas flow was measured in static conditions. Each device was evaluated during a eupneic and a tachypneic simulated breathing test.

RESULTS

The gas output flow generated by each device increased with higher oxygen input flow; EasyVent and Flowone produced the highest output flow ( < .001). At the simulated eupneic breathing test, Superflow and EasyVent showed a more stable pressure swing at different PEEP levels, whereas the other masks had a greater swing, between 10 and 15 cm HO PEEP ( = .002 for all pairwise comparisons). During the tachypneic breathing test, the pressure swing was stable with Flowone and EasyVent ( = .055), whereas it had increased with other masks ( = .002 for all pairwise comparisons).

CONCLUSIONS

We found a significant variation in the performances of the 8 CPAP devices examined in this study. The technical characteristics and limitations of different CPAP devices should be considered when using in patients with hypoxemic acute respiratory failure.