Variable | PEEP 5 incremental phase | PEEP 10 incremental phase | PEEP 15 | PEEP 10 decremental phase | PEEP 5 decremental phase | Friedman test p value |
---|---|---|---|---|---|---|
Nondependent silent spaces, % | 0.4 [0–3.3] | 1.3 [0–3.9] | 1.4 [0.4–4.3] | 1.7 [0.5–3.0] | 0.7 [0.1–2.2] | 0.109 |
Dependent silent spaces, % | 16.3 [11.7–17.9] | 12.3 [9.2–15.2]a | 8.7 [6.2–11.1]a,b | 10.4 [8.0–12.7]a,c | 13.6 [9.1–16.2]a,c,d | < 0.001 |
Center of ventilation ventral-dorsal, % | 41.9 [38.1–48.8] | 46.3 [41.8–50.8]a | 49.4 [46.9–54.8]a,b | 47.7 [44.3–52.3]a,c | 43.2 [40.9–50.9]a,c,d | < 0.001 |
Regional compliance (ROI 4), ml/cmH2O | 3.09 [1.21–4.95] | 4.32 [2.92–6.03]a | 5.90 [4.63–6.8]a,b | 6.01 [4.53–6.53]a,b | 4.27 [2.64–5.34]c,d | < 0.001 |
Regional compliance (ROI 3), ml/cmH2O | 10.52 [7.74–12.27] | 12.32 [8.64–14.03]a | 13.12 [10.41–14.96]a,b | 13.10 [10.77–17.35]a,b | 11.25 [9.11–14.5]a,d | < 0.001 |
Regional compliance (ROI 2), ml/cmH2O | 13.9 [12.24–18.97] | 13.55 [12.82–17.06] | 13.09 [11.07–15.93]b | 14.95 [12.59–19.32]b,c | 14.74 [11.38–20.21] | 0.026 |
Regional compliance (ROI 1), ml/cmH2O | 10.53 [7.51–13.27] | 7.89 [5.93–9.73] | 6.15 [4.63–8.15]a,b | 7.68[6.95–10.96]c | 10.98 [6.26–12.58]c | < 0.001 |
Tidal distribution index | 1.9 [1.4–2.9] | 1.3 [0.8–1.7]a | 1.0 [0.7–1.2]a,b | 1.3 [1.1–1.7]a,c | 1.8 [1.4–2.2]a,c | < 0.001 |
Regional compliance dependent lung, ml/cmH2O | 11.9 [10.4–16.7] | 17.7 [12.3–19.2]a | 19.1 [14.2–21.3]a,b | 18.9 [15.7–22.8]a,b | 16.0 [12.3–19.8]a,d | < 0.001 |
Regional compliance nondependent lung, ml/cmH2O | 25.3 [21.3–30.4] | 22.7 [19.5–25.8] | 20.0 [16.6–22.8]b | 24.3 [18.7–28.5]c | 26.4 [17.5–30.7] | < 0.001 |
∆EELV, ml | 170 [132–242] | 495 [411–565]a | 800 [638–943]a,b | 435 [336–574]a,c | 190 [133–262]b,c,d | < 0.001 |
∆EELI, ml | 170 [105–260] | 559 [404–716]a | 1190 [903–1378]a,b | 777 [500–930] a,b,c | 270 [191–410]a,b,c,d | < 0.001 |
Recruitment P-V curve, ml | Baseline | 87.60 [32.20–119.00] | 114.50 [71.50–171.00] | −82.20 [−164.70 to 3.00] | −101.20 [−158.50 to −28.00] | |
Recruitment P-V curve, ml/kg IBW | Baseline | 1.32 [0.66–2.18] | 2.09 [1.05–3.22] | −1.61 [−3.26 to 0.04] | −1.65 [−2.22 to −0.59] |