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Table 1 MW of ventilation (cmH2O.L) with different flow waveforms (decelerating, square, and sinusoidal) with three types of lung mechanics

From: The effects of pressure- versus volume-controlled ventilation on ventilator work of breathing

Pressure setting Inspiratory flow waveform Normal lung R 10 cmH2O/L/s, C 0.1 L/cmH2O Restrictive lung diseases R 10 cmH2O/L/s,
C 0.05 L/cmH2O
Obstructive lung diseases R 20 cmH2O/L/s, C 0.1 L/cmH2O
tr 0.01 s,
PS 10 cmH2O
Decelerating
Square
Sinusoidal
6.17
5.81
6.71
4.18
3.57
3.99
3.86
3.77
4.48
tr 0.1 s,
PS 10 cmH2O
Decelerating
Square
Sinusoidal
4.98
4.40
5.08
3.11
2.44
2.72
3.23
2.99
3.55
tr 0.01 s,
PS 20 cmH2O
Decelerating
Square
Sinusoidal
24.69
23.23
26.85
16.71
14.28
15.95
15.44
15.09
17.91
tr 0.1 s,
PS 20 cmH2O
Decelerating
Square
Sinusoidal
19.92
17.57
20.31
12.44
9.74
10.88
12.90
11.96
14.20
  1. Also illustrated 2 levels of pressure support and 2 rise times. The square flow waveform has the smallest MW for all lung conditions. In normal and restrictive lungs the largest MW results from decelerating flow, while in obstructive lung condition the sinusoidal flow has the largest MW