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Table 3 Devices inspiratory resistive load

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

 

O2 flow (L/min)

PEEP (cm H2O)

Inspiratory demand with Vt target of 300 mL

Inspiratory demand with Vt target of 500 mL

P-P (cm H2O)*

P-P (cm H2O)*

PB 980

N/A

6.0

4.1 ± 0.05

5.2 ± 0.02

AirSense CPAP

N/A

6.8

0.9 ± 0.02

1.7 ± 0.03

Boussignac CPAP

20

6.6

3.0 ± 0.05

4.9 ± 0.04

O-Two CPAP

9

7.1

4.0 ± 0.05

6.6 ± 0.06

Ventumask CPAP

22

6.6

5.9 ± 0.05

11.8 ± 0.02

Bag-CPAP Venturi connector

5

5.9

7.8 ± 0.03

11.2 ± 0.02

10

7.5

1.4 ± 0.02

2.9 ± 0.03

Bag-CPAP conventional connector

15

6.2

5.6 ± 0.04

9.2 ± 0.02

20

5.7

4.0 ± 0.06

8.7 ± 0.05

  1. *P-P: peak-to-peak airway pressure, representing the maximal change between inspiratory and expiratory airway pressure. The higher the resistive load of the device, the higher the P-P
  2. The test lung simulated moderate and high respiratory demands: different muscle pressures were simulated to target tidal volumes (Vt) of 300 and 500 mL. P-P is defined as the maximum change between inspiratory and expiratory airway pressure throughout the simulated respiratory cycle. It represents the ability of the device to maintain the positive airway pressure at the level set regardless of the phase of the respiratory cycle, the ideal value being equal to zero. The Bag-CPAP was tested in different oxygen flow conditions, with the Venturi connector at 5 L/min and 10 L/min and with the conventional oxygen connector at 15 L/min and 20 L/min. All differences between devices were statistically significant (one-way ANOVA with Bonferroni correction, p < 0.005)
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Critical Care

ISSN: 1364-8535