From: Dynamic hyperinflation and intrinsic positive end-expiratory pressure in ARDS patients
Parameter | Patients with intrinsic PEEP (n = 87) | Patients without intrinsic PEEP (n = 130) | PPEEPi | PPEEP | PPEEPix PEEP |
---|---|---|---|---|---|
Tidal volume (mL) | 0.012 | 0.357 | 0.874 | ||
 5 cmH2O | 480 [430–540] | 520 [445–600] |  |  |  |
 15 cmH2O | 480 [430–540] | 510 [430–590] |  |  |  |
Respiratory rate (breath/min) | < 0.001 | 0.992 | 0.954 | ||
 5 cmH2O | 18 [15–20] | 15 [13–19] |  |  |  |
 15 cmH2O | 18 [15–20] | 15 [13–19] |  |  |  |
Minute ventilation (L/min) | 0.007 | 0.559 | 0.048^ | ||
 5 cmH2O | 8.6 [7.6–10.2] | 8.0 [6.9–9.4] |  |  |  |
 15 cmH2O | 8.6 [7.3–10.7] | 7.9 [6.8–9.4] |  |  |  |
Plateau pressure (cmH2O) | 0.726 | < 0.001 | 0.061 | ||
 5 cmH2O | 18.4 [16.3–21.4] | 18.0 [15.5–20.2] |  |  |  |
 15 cmH2O | 27.8 [24.9–30.0] | 28.0 [25.4–30.0] |  |  |  |
Expiratory time (s) | 0.002 | 0.884 | 0.774 | ||
 5 cmH2O | 2.36 [1.99–2.93] | 2.80 [2.12–3.43] |  |  |  |
 15 cmH2O | 2.31 [1.92–2.92] | 2.80 [2.12–3.40] |  |  |  |
Total resistance (cmH2O s L−1) | 0.246 | 0.679 | 0.286 | ||
 5 cmH2O | 13 [11–20] | 14 [11–18] |  |  |  |
 15 cmH2O | 13 [10–18] | 15 [12–19] |  |  |  |
Respiratory system compliance (mL cmH2O−1) | 0.170 | 0.023 | 0.698 | ||
 5 cmH2O | 43 [34–53] | 41 [31–52] |  |  |  |
 15 cmH2O | 41 [30–51] | 38 [33–49] |  |  |  |
Lung compliance (mL cmH2O−1) | 0.004 | 0.088 | 0.250 | ||
 5 cmH2O | 57 [44–78] | 57 [43–71] |  |  |  |
 15 cmH2O | 57 [44–72] | 54 [41–66] |  |  |  |
Chest wall compliance (mL cmH2O−1) | 0.981 | 0.564 | 0.388 | ||
 5 cmH2O | 174 [125–272] | 178 [116–269] |  |  |  |
 15 cmH2O | 160 [103–272] | 158 [111–238] |  |  |  |
Time constant (s) | 0.192 | 0.549 | 0.554 | ||
 5 cmH2O | 0.65 [0.43–0.79] | 0.63 [0.45–1.00] |  |  |  |
 15 cmH2O | 0.56 [0.36–0.77] | 0.57 [0.44–0.73] |  |  |  |