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

Table 4 Calculation of the ∆WOB patient (%) according to two simulated inspiratory demands

	Moderate inspiratory demand with Vt target of 300 ml		High inspiratory demand with Vt target of 500 ml
	∆WOB patient (%)		∆WOB patient (%)
PB 980	0		0
AirSense CPAP	− 2		− 11
Boussignac CPAP	+ 35		+ 26
O-Two CPAP	+ 50		+ 38
Ventumask CPAP	+ 68		+ 96
Bag-CPAP with Venturi^a	+ 137	+ 18	+ 106	+ 18
Bag-CPAP with conventional connector^b	+ 92	+ 37	+ 71	+ 66

^aOxygen flow set at 5 L/min and 10 L/min
^bOxygen flow set at 15 L/min and 20 L/min
∆WOB patient represents the relative variation of the simulated patient’s work of breathing needed to maintain the tidal volume obtained with the ICU ventilator (PB 980). See Fig. 4 as well. 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

ISSN: 1364-8535