Table 1 Effect of additional 500 mL intra-abdominal volume on intra-abdominal and peak airway pressure at different grades of intra-abdominal hypertension
From: The respiratory pressure—abdominal volume curve in a porcine model
Given IAP, cmH2O (mmHg) | IAH grade | PAW at given IAP, cmH2O | Additional IAV at given IAP, L | IAV increased by 0.5 L, L | IAP after addition of 0.5 L IAV, cmH2O (mmHg) | Resulting increase in IAP, cmH2O (mmHg) | CAB, mL/mmHg | Resulting increase in PAW, cmH2O |
|---|---|---|---|---|---|---|---|---|
5.0 (3.7) | Baseline | 20.5 | 0.0 | 0.5 | 5.0 (3.7) | 0.0 (0.0) | – | 0.0 |
16.3 (12.0) | 1 | 24.8 | 7.7 | 8.2 | 20.4 (15.0) | 4.0 (3.0) | 168 | 1.5 |
21.8 (16.0) | 2 | 26.8 | 8.4 | 8.9 | 27.7 (20.4) | 6.0 (4.4) | 114 | 2.2 |
28.5 (21.0) | 3 | 29.3 | 8.9 | 9.4 | 36.9 (27.2) | 8.4 (6.2) | 81 | 3.0 |
35.3 (26.0) | 4 | 31.8 | 9.3 | 9.8 | 46.1 (33.9) | 10.8 (7.9) | 63 | 3.9 |