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Table 3 Ultrasonographic and pressure measurements during the three steps of the study

From: Diaphragm ultrasound as indicator of respiratory effort in critically ill patients undergoing assisted mechanical ventilation: a pilot clinical study

 

PS15

PS5

PS0

P

PMI, cmH2 O

−3.65 ± 5.31

2.58 ± 4.86

6.61 ± 4.36

<0.001

P0.1, cmH2 O

0.30 (0.20; 0.70)

0.80 (0.50; 1.20)

1.80 (1.20; 2.80)

<0.001

PTPes/breath, cmH2 O* sec

0.50 (0.12; 0.82)

2.11 (0.96; 3.72)

4.28 (2.86; 6.70)

<0.001

PTPdi/breath, cmH2 O* sec

1.12 (0.17; 1.69)

2.73 (1.63; 3.80)

4.48 (3.30; 7.48)

<0.001

PTPes/min, cmH2 O* sec/min

4.78 (0.76; 8.98)

26.10 (16.20; 44.69)

53.31 (39.30; 77.11)

<0.001

PTPdi/min, cmH2 O* sec/min

10.60 (1.09; 23.03)

36.15 (30.06; 62.66)

57.12 (54.39; 109.84)

<0.001

ΔPes, cmH2 O

3.79 ± 2.65

−2.36 ± 3.03

−4.85 ± 3.67

<0.001

ΔPdi, cmH2 O

2.78 (1.09; 4.22)

−1.65 (−5.03; −0.25)

−3.54 (−7.57; −1.54)

<0.001

Thickening fraction, %

13.0 ± 5.2

28.2 ± 9.9

52.7 ± 15.9

<0.001

Excursion, cm

1.48 (0.84; 1.98)

1.33 (1.13; 1.73)

1.50 (1.25; 1.70)

0.797

  1. Results are expressed as mean ± SD or median (IQR). PS, pressure support; PMI, estimated pressure developed by the inspiratory muscles at the end of an inspiratory effort (Pmusc) index; P0.1, airway occlusion pressure in the first 100 ms; PTPes, esophageal pressure-time product; PTPdi diaphragmatic pressure-time product; ΔPes, inspiratory variation of esophageal pressure; ΔPdi, inspiratory variation of transdiaphragmatic pressure.