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Table 3 Characteristics of patients, changes in breathing pattern, diaphragm function, and diaphragm shear modulus in patients with and without a significant correlation between changes in transdiaphragmatic pressure and changes in diaphragm shear modulus

From: Ultrasound shear wave elastography for assessing diaphragm function in mechanically ventilated patients: a breath-by-breath analysis

  Significant ΔPdi-ΔSMdi correlation Non-significant ΔPdi-ΔSMdi correlation p value
(n = 8) (n = 16)
Patients’ characteristics
Age, years 62 (57 to 71) 73 (60 to 79)  < 0.001
Body mass index, kg·m−2 24.6 (18.0 to 27.0) 25.8 (23.2 to 30.4) 0.224
Breathing pattern
VT, mL/kg 4.8 (3.9 to 6.0) 4.6 (3.8 to 6.1) 0.818
Respiratory rate, cycles/min 21 (15 to 26) 25 (18 to 33)  < 0.001
Diaphragm function
ΔPdi, cmH2O 7.5 (3.3 to 16.9) 6.0 (1.8 to 13.2) 0.086
PTPdi, cmH2O.s/breath 4.5 (1.9 to 10.6) 4.3 (1.2 to 8.0) 0.019
PTPdi, cmH2O.s/min 91 (34 to 260) 102 (24 to 189) 0.088
ΔPes, cmH2O −6.4 (−13.2 to −1.9) −6.5 (−13.3 to −1.9) 0.443
ΔPga, cmH2O 1.5 (0.1–2.6) 0.6 (0.1–1.6) 0.004
ΔSMdi, kPa 9.4 (4.5–14.1) 6.3 (4.1–9.9)  < 0.001
  1. Results are shown as median (Q1–Q3). VT, tidal volume; ΔPdi, inspiratory changes in transdiaphragmatic pressure; PTPdi, transdiaphragmatic pressure time product; ΔPes, inspiratory changes in esophageal pressure; ΔPga, inspiratory changes in gastric pressure; ΔSMdi, inspiratory changes in diaphragm shear modulus