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Table 2 Oxygen consumption and actual Fio2 delivered by each device in two case scenarios

From: A new reservoir-based CPAP with low oxygen consumption: the Bag-CPAP

 

Moderate respiratory demand—Moderate FiO2 (40–60%)

High respiratory demand—High FiO2 (80–100%)

Oxygen flow (L/min)

Mean FiO2 (%)

Oxygen flow (L/min)

Mean FiO2 (%)

Puritan Benetta

N/A

56 ± 0.5

N/A

100 ± 0.02

AirSense CPAP

12

48 ± 0.4

30

84 ± 0.9

Boussignac CPAP

20

66 ± 1.8

25

50 ± 0.8

O-two CPAP

9

42 ± 0.7

12

38 ± 0.3

Ventumask CPAPb

22

47 ± 0.6

42

80 ± 1.9

Bag-CPAP

5

60 ± 0.5

15

96 ± 1.3

  1. Moderate and high respiratory demands correspond to two simulated patient efforts, detailed in the methods section. Each device was assessed with two different FiO2 target ranges depending on the simulated demand: moderate FiO2 (40–60%) for the moderate respiratory demand, and high FiO2 (80–100%) for the high respiratory demand. Mean (standard deviation) FiO2 was calculated as the mean fraction of oxygen measured at the trachea of the manikin during the simulated respiratory cycle
  2. aOxygen flow rate was not available with the ICU ventilator, moderate FiO2 was set at 55% and high FiO2 at 100%
  3. bVentumask was used with two oxygen sources (tube A and tube B, according to manufacturer’s specifications)
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Critical Care

ISSN: 1364-8535