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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