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Table 1 Haemodynamic and respiratory parameters at the three PEEP levels

From: Positive end-expiratory pressure affects the value of intra-abdominal pressure in acute lung injury/acute respiratory distress syndrome patients: a pilot study

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*
  1. Values are expressed as mean ± standard deviation.
  2. Abdominal perfusion pressure was calculated as: mean arterial pressure minus IAP.
  3. *P < 0.05 PEEP0 vs PEEP12.
  4. IAP, intra-abdominal pressure; PEEP, positive end-expiratory pressure.