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Table 2 Characteristics of occluded breaths for each pattern of Paw during occlusion

From: Airway pressure morphology and respiratory muscle activity during end-inspiratory occlusions in pressure support ventilation

 

Paw pattern

 

Passive-like

N = 29

Clear plateau

N = 104

Irregular rise

N = 94

PS < 8 cmH2O, N (%)

0 (0)

29 (28)

38 (40)

PS 8–10 cmH2O, N (%)

5 (17)

47 (45)

35 (38)

PS > 10 cmH2O, N (%)

24 (83)

28 (27)

21 (22)

Expiratory muscle activity present, N (%)

15 (52)

70 (67)

94 (100)

Expiratory muscle in activity in previous breath, N (%)

7 (24)

39 (37)

83 (88)

Respiratory rate mean ± SD

19 ± 5

21 ± 4

22 ± 6

dPdi/dt, cmH2O/s, median (IQR)

7* (3–8)

11 (6–20)

10 (6–20)

Cycling off delay, s, median (IQR)

0.28* (0.18–0.56)

0.18 (0.14–0.28)

0.18 (0.12–0.24)

  1. Paw airway pressure, PS pressure support, dPdi/dt rate of change of transdiaphragmatic pressure, SD standard deviation, IQR interquartile range
  2. *p < 0.01 for passive-like pattern vs clear plateau and irregular rise pattern
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Critical Care

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