Table 2

Inspiratory effort for varying levels of pressure support for C = 0.02 L/cm H2O, k =6.6, Vt=700 ml, and RR = 25 bpm
Ventilator Work [J/I]
Gas Psupport[cm H20] Inspiratory Effort [J/I] Theoretical Experimental*
Medical Air 0 3.52 ± 0.25
10 2.66 ± 0.11 1.00 0.86 ± 0.36
15 2.08 ± 0.03 1.50 1.44 ± 0.28
He/O278/22 0 2.45 ± 0.01
10 1.77 ± 0.20 1.00 0.68 ± 0.21
15 1.15 ± 0.01 1.50 1.30 ± 0.02

*Determined from the difference between inspiratory effort at Psupport = 0 and that at Psupport = 10 or 15 cm H2O.

Martin et al.

Martin et al. BMC Pulmonary Medicine 2012 12:62   doi:10.1186/1471-2466-12-62

Open Data