|  | Tween | ||||||
---|---|---|---|---|---|---|---|---|
 | Baseline | Instillation | 30 min | 60 min | 90 min | 120 min | 150 min | 180 min |
High Vt plus low PEEP | ||||||||
   Ppeak | 23 ± 0.6 | 31 ± 1.3* | 37 ± 1.9*†| 38 ± 2.0*†| 37 ± 2.0*†| 37 ± 2.0*†| 37 ± 2.0*†| 36 ± 1.9*†|
   Pmean | 9 ± 0.4 | 11 ± 0.1* | 12 ± 0.3* | 12 ± 1.0* | 12 ± 1.0* | 12 ± 1.0* | 12 ± 1.0* | 11 ± 0.3* |
   Cstat | 30 ± 4 | 18 ± 3* | 17 ± 2* | 15 ± 3* | 18 ± 2* | 18 ± 2* | 19 ± 2* | 19 ± 2* |
   CO | 8.5 ± 1 | 6.6 ± 1.2 | 4.9 ± 0.6* | 3.7 ± 0.8*†| 3.3 ± 0.4*†| 3.4 ± 0.5*†| 3.4 ± 0.5*†| 2.7 ± 0.3*†|
   SAT | 100 ± 1 | 80 ± 2.3* | 84 ± 1.0* | 90 ± 4.2* | 91 ± 1.2 | 92 ± 1.5* | 92 ± 0.6* | 90 ± 1.0* |
   PO2 | 295 ± 22 | 54 ± 5* | 53 ± 3* | 64 ± 8* | 65 ± 5* | 70 ± 5* | 71 ± 6* | 71 ± 4* |
   PCO2 | 38 ± 0.6 | 51 ± 2.7* | 41 ± 2.0†| 36 ± 3.2†| 36 ± 1.9†| 35 ± 4.1†| 33 ± 2.5†| 32 ± 0.6†|
   pH | 7.52 ± 0.1 | 7.42 ± 0.1 | 7.49 ± 0.1 | 7.51 ± 0.1 | 7.53 ± 0.1 | 7.53 ± 0.1 | 7.54 ± 0.1 | 7.54 ± 0.1 |
   Aa | 28 ± 13 | 596 ± 5* | 566 ± 40* | 578 ± 27* | 572 ± 17* | 543 ± 25* | 520 ± 34* | 523 ± 34* |
Low Vt/high PEEP | ||||||||
   Peak | 23 ± 1.0 | 33 ± 0.9* | 49 ± 0.9*†| 40 ± 1.8*†| 42 ± 2.0*†| 42 ± 2.5*†| 42 ± 3.1*†| 43 ± 3.8*†|
   Pmean | 10 ± 0.9 | 12 ± 0.6* | 25 ± 0.3‡*†| 24 ± 0.3*†‡ | 25 ± 0.3*†‡ | 25 ± 0.7*†‡ | 25 ± 0.7*†‡ | 26 ± 0.9*†‡ |
   Cstat | 33 ± 4 | 19 ± 2* | 12 ± 1*†| 12 ± 1*†| 12 ± 1*†| 13 ± 2*†| 15 ± 2*†| 15 ± 2*†|
   CO | 7.4 ± 1.8 | 8.9 ± 0.8 | 8.1 ± 0.8‡ | 6.6 ± 0.8 | 5.8 ± 1.3 | 5.0 ± 1.4* | 5.9 ± 1.9 | 5.0 ± 2.0* |
   SAT | 99 ± 0.3 | 64 ± 3.2‡ * | 98 ± 0.3†‡ | 96 ± 1.0†| 95 ± 0.3†‡ | 88 ± 6.5†| 98 ± 0.8†‡ | 98 ± 1.0†‡ |
   PO2 | 361 ± 115 | 59 ± 14* | 216 ± 62‡ | 178 ± 37‡ | 139 ± 14‡ | 127 ± 10‡ | 138 ± 15‡ | 142 ± 15*‡ |
   PCO2 | 49 ± 1.9‡ | 62 ± 0.7‡ | 108 ± 8.9*†‡ | 122 ± 15*†‡ | 119 ± 15*†‡ | 114 ± 13*†‡ | 112 ± 17*†‡ | 103 ± 14*†‡ |
   pH | 7.41 ± 0.1‡ | 7.30 ± 0.1*‡ | 7.12 ± 0.1*†‡ | 7.07 ± 0.1*†‡ | 7.07 ± 0.1*†‡ | 7.06 ± 0.1*†‡ | 7.05 ± 0.1*†‡ | 7.09 ± 0.1*†‡ |
   Aa | 53 ± 15 | 576 ± 14* | 362 ± 64*†| 382 ± 46*†‡ | 425 ± 30*†‡ | 444 ± 27*†| 463 ± 36*†| 473 ± 31*†|