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Fig. 4 | Critical Care

Fig. 4

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

Fig. 4

Relationship between changes in diaphragm shear modulus and changes in transdiaphragmatic pressure. Averaged data (panel a, data are shown as median (Q1–Q3)) and all data points with individual and overall linear regression lines (panel b). Panel c displays the individual linear regressions in patients with a significant ΔPdi-ΔSMdi correlation (p < 0.05). Panel d displays the individual linear regressions in patients with no significant ΔPdi-ΔSMdi correlation (p > 0.05). ΔPdi, inspiratory change in transdiaphragmatic pressure; ΔSMdi, inspiratory change in diaphragm shear modulus assessed using ultrasound shear wave elastography; PS, pressure support ventilation with baseline inspiratory support and positive end-expiratory pressure; PS+25%, PS with inspiratory pressure support increased by 25%; PS−25%, PS with inspiratory pressure support decreased by 25%; PSZEEP, PS with baseline inspiratory support and positive end-expiratory pressure set at 0; SBT Start, start of the spontaneous breathing trial. In panel a., only cycles gathered at the end of each condition and at the start of SBT were used. In panel b, cycles gathered at all time-points were used

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