Table 2.
Course of respiratory parameters during intra-abdominal hypertension with estimated differences between groups
| IAH | FCVa (n = 9) | PCVa (n = 9) | Estimate with 95% CIb | p-valuec |
|---|---|---|---|---|
| VT [ml/kg] | ||||
| Grade 0 | 9.8 | 7.1 | 2.7 (1.7 to 3.7) | < 0.001* |
| Grade 1 | 8.6 | 7.0 | 1.5 (0.6 to 2.4) | 0.0039* |
| Grade 2 | 7.7 | 7.0 | 0.7 (− 0.1 to 1.4) | 0.0941 |
| Grade 3 | 7.6 | 7.0 | 0.5 (− 0.4 to 1.4) | 0.2606 |
| RR [/min] | ||||
| Grade 0 | 14 | 34 | − 20 (− 23 to − 16) | < 0.001* |
| Grade 1 | 16 | 34 | − 18 (− 21 to − 14) | < 0.001* |
| Grade 2 | 18 | 34 | − 15 (− 19 to 11) | < 0.001* |
| Grade 3 | 19 | 33 | − 14 (− 18 to − 10) | < 0.001* |
| MV [l/min] | ||||
| Grade 0 | 7.5 | 14.8 | − 7.4 (− 9.1 to − 5.6) | < 0.001* |
| Grade 1 | 7.4 | 14.5 | − 7.0 (− 8.8 to − 5.3) | < 0.001* |
| Grade 2 | 7.6 | 14.1 | − 6.6 (− 8.2 to − 4.9) | < 0.001* |
| Grade 3 | 7.8 | 14.2 | − 6.4 (− 8.0 to − 4.8) | < 0.001* |
| MP [l/min] | ||||
| Grade 0 | 10.1 | 28.9 | − 18.8 (− 23.8 to − 13.8) | < 0.001* |
| Grade 1 | 17.0 | 41.7 | − 24.7 (− 31.4 to − 18.0) | < 0.001* |
| Grade 2 | 22.0 | 51.2 | − 29.2 (− 37.2 to − 21.3) | < 0.001* |
| Grade 3 | 25.9 | 57.6 | − 31.7 (− 39.1 to − 24.3) | < 0.001* |
| PEEP [mmHg] | ||||
| Grade 0 | 3 | 5 | − 2 (− 2 to − 2) | 0.9804 |
| Grade 1 | 10 | 9 | 1 (0 to 2) | 0.9539 |
| Grade 2 | 15 | 14 | 2 (− 1 to 4) | 0.1890 |
| Grade 3 | 18 | 16 | 2 (− 1 to 4) | 0.1924 |
| Ppeak [mmHg] | ||||
| Grade 0 | 21 | 20 | 1 (− 1 to 3) | 0.1935 |
| Grade 1 | 33 | 29 | 4 (1 to 6) | 0.0141* |
| Grade 2 | 40 | 37 | 4 (1 to 6) | 0.0045* |
| Grade 3 | 46 | 41 | 5 (2 to 7) | 0.0034* |
| Pes [cmH2O] | ||||
| Grade 0 | 9.9 | 10.7 | − 0.7 (− 3.2 to 1.7) | 0.5609 |
| Grade 1 | 15.4 | 14.9 | 0.5 (− 3.8 to 4.7) | 0.8395 |
| Grade 2 | 19.5 | 17.8 | 1.7 (− 3.6 to 7.0) | 0.5417 |
| Grade 3 | 22.9 | 19.6 | 3.4 (− 2.4 to 9.1) | 0.2654 |
| C [ml/cmH2O] | ||||
| Grade 0 | 27.2 | 38.7 | − 11.5 (− 18.8 to − 4.2) | 0.0072* |
| Grade 1 | 19.4 | 25.1 | − 5.6 (− 9.7 to − 1.5) | 0.0160* |
| Grade 2 | 15.9 | 20.2 | − 4.3 (− 7.6 to − 1.0) | 0.0214* |
| Grade 3 | 13.9 | 18.2 | − 4.2 (− 7.7 to − 0.7) | 0.0304* |
| Ccalc [ml/cmH2O] | ||||
| Grade 0 | 35.5 | 29.3 | 6.2 (1.0 to 11.3) | 0.0325* |
| Grade 1 | 24.9 | 22.4 | 2.5 (− 0.9 to 5.9) | 0.1728 |
| Grade 2 | 20.9 | 18.7 | 2.3 (− 1.7 to 6.2) | 0.2719 |
| Grade 3 | 18.9 | 16.9 | 2.0 (− 3.8 to 7.8) | 0.5128 |
| R [cmH2O·s/l] | ||||
| Grade 0 | 6.3 | 7.2 | − 0.9 (− 2.0 to 0.2) | 0.1170 |
| Grade 1 | 7.6 | 8.1 | − 0.5 (− 1.4 to 0.5) | 0.3396 |
| Grade 2 | 9.0 | 8.9 | 0.2 (− 0.9 to 1.2) | 0.7726 |
| Grade 3 | 9.6 | 9.6 | 0.0 (− 1.6 to 1.7) | 0.9790 |
| PaO2 [mmHg] | ||||
| Grade 0 | 118 | 114 | 4 (− 6 to 14) | 0.4022 |
| Grade 1 | 114 | 107 | 7 (− 2 to 16) | 0.1301 |
| Grade 2 | 114 | 102 | 12 (− 1 to 25) | 0.0918 |
| Grade 3 | 116 | 104 | 12 (− 1 to 25) | 0.0864 |
| PaCO2 [mmHg] | ||||
| Grade 0 | 42 | 42 | 0 (− 2 to 2) | 0.8983 |
| Grade 1 | 43 | 42 | 1 (− 2 to 4) | 0.5619 |
| Grade 2 | 43 | 41 | 2 (0 to 4) | 0.0999 |
| Grade 3 | 43 | 42 | 2 (− 1 to 4) | 0.1916 |
C displayed compliance from the ventilator, CCalc calculated static compliance, FCV flow-controlled ventilation, IAH intra-abdominal hypertension, MP mechanical power, MV respiratory minute volume, PaCO2 arterial partial pressure of carbon dioxide, PaO2 arterial partial pressure of oxygen, PCV pressure-controlled ventilation, PEEP positive end-expiratory pressure, Pes end-expiratory esophageal pressure, Ppeak peak pressure, R resistance, RR respiratory rate, VT tidal volume, ΔP driving pressure (= peak pressure – positive end-expiratory pressure)
aContinuous data presented as medians
bEstimated median difference for continuous variables
cAssessed by Wilcoxon rank sum test for continuous variables, significant differences (p < 0.05) are marked with an asterisk