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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.