PEEP at postmeasurement vs. at premeasurement | ||||
---|---|---|---|---|
Measured variables | Decreased (n = 20) | Unchanged (n = 27) | Increased (n = 8) | P value |
Markers of overdistentiona | ||||
Pplat, cmH2O | 28 ± 5b | 25 ± 4b | 26 ± 2 | 0.013 |
Elastance-derived PL,plat, cmH2O | 21 [20–26]b | 17 [16–20]b | 18 [16–21] | 0.034 |
PL,end-insp, cmH2O | 5 [3–18] | 8 [4–9] | 4 [0–10] | 0.327 |
Pdriv, cmH2O | 15 ± 5 | 12 ± 4 | 13 ± 3 | 0.098 |
PL,driv, cmH2O | 12 ± 5 | 9 ± 4 | 9 ± 5 | 0.063 |
Risk of atelectasisa | ||||
PL,end-exp, cmH2O | −2 ± 5 | −2 ± 5 | −5 ± 5 | 0.335 |
Response to the incremental PEEP trialc | ||||
Changes in Pdriv, cmH2O | 2.0 [0–3.5] | 1.0 [0–1.0] | 0.5 [0–12] | 0.169 |
Changes in PL,driv, cmH2O | 1.9 ± 2.5 | 0.7 ± 1.8 | −0.3 ± 1.2 | 0.042 |
Changes in PaO2/FiO2, mmHg | −4 [−17 to 12] | 0 [−18 to 14] | 3 [−29 to 10] | 0.226 |
Changes in MAP, mmHg | −2 [−10 to 3] | −2 [2-9] | −3 [−8 to 0] | 0.675 |
Recruitabilityd | ||||
Vder, ml | 105 ± 61e | 142 ± 106 | 208 ± 124e | 0.036 |