Table 1 Haemodynamic and respiratory parameters at the three PEEP levels
PEEP level (cmH2O) | 0 | 6 | 12 | |
|---|---|---|---|---|
Heart rate, beats/min | Total (n = 30) | 87 ± 16 | 83 ± 22 | 90 ± 19 |
High IAP group (n = 15) | 95 ± 17 | 88 ± 27 | 97 ± 19 | |
Low IAP group (n = 15) | 77 ± 10 | 78 ± 11 | 80 ± 13 | |
Mean arterial pressure, mmHg | Total (n = 30) | 89 ± 14 | 88 ± 14 | 85 ± 12 |
High IAP group (n = 15) | 90 ± 15 | 88 ± 15 | 84 ± 12 | |
Low IAP group (n = 15) | 89 ± 12 | 88 ± 13 | 87 ± 13 | |
Abdominal perfusion pressure, mmHg | Total (n = 30) | 77 ± 13 | 74 ± 14 | 70 ± 12* |
High IAP group (n = 15) | 74 ± 15 | 70 ± 15 | 64 ± 11* | |
Low IAP group (n = 15) | 79 ± 11 | 78 ± 12 | 76 ± 11 | |
Central venous pressure, mmHg | Total (n = 30) | 11 ± 4 | 12 ± 4 | 14 ± 5* |
High IAP group (n = 15) | 11 ± 4 | 13 ± 4 | 14 ± 4* | |
Low IAP group (n = 15) | 10 ± 5 | 11 ± 5 | 13 ± 5* | |
Cardiac output, L/min | Total (n = 13) | 6.0 ± 2.0 | 5.8 ± 1.7 | 5.8 ± 1.8 |
High IAP group (n = 8) | 6.7 ± 2.0 | 6.4 ± 1.7 | 6.4 ± 1.8 | |
Low IAP group (n = 5) | 5.0 ± 1.6 | 4.9 ± 1.4 | 4.7 ± 1.3 | |
Respiratory rate, breaths/min | Total (n = 30) | 17 ± 4 | 17 ± 4 | 17 ± 4 |
High IAP group (n = 15) | 18 ± 4 | 18 ± 4 | 18 ± 4 | |
Low IAP group (n = 15) | 16 ± 3 | 16 ± 3 | 16 ± 3 | |
Tidal volume, ml | Total (n = 30) | 634 ± 142 | 633 ± 145 | 629 ± 146 |
High IAP group (n = 15) | 639 ± 178 | 640 ± 180 | 634 ± 183 | |
Low IAP group (n = 15) | 628 ± 84 | 624 ± 88 | 623 ± 89 | |
Plateau airway pressure, cmH2O | Total (n = 30) | 20 ± 5 | 24 ± 4 | 29 ± 5* |
High IAP group (n = 15) | 22 ± 5 | 25 ± 3 | 31 ± 3* | |
Low IAP group (n = 15) | 18 ± 5 | 22 ± 4 | 26 ± 5* | |
Dynamic compliance, ml/cmH2O | Total (n = 30) | 41 ± 14 | 44 ± 15 | 47 ± 17* |
High IAP group (n = 15) | 42 ± 17 | 44 ± 18 | 46 ± 20* | |
Low IAP group (n = 15) | 40 ± 11 | 44 ± 12 | 48 ± 12* |