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Table 1 Respiratory mechanics in supine and prone position according to PEEP strategy

From: Effects of positive end-expiratory pressure strategy in supine and prone position on lung and chest wall mechanics in acute respiratory distress syndrome

Variables Supine position Prone position P values N*
  PEEP/FIO2 table Pes-guided strategy PEEP/FIO2 table Pes-guided strategy Position effect PEEP strategy effect Position and PEEP interaction  
PEEP set on ventilator (cmH2O) 10 ± 2 12 ± 4 10 ± 2 12 ± 5 0.96 0.05 0.96 37
Paw,ee (cmH2O) 11 ± 3 13 ± 4 11 ± 3 13 ± 5 0.47 0.05 0.91 37
Paw,ei (cmH2O) 23 ± 4 24 ± 6 22 ± 4 24 ± 6 0.11 0.08 0.78 37
Pes,ee (cmH2O) 9 ± 4 10 ± 5 9 ± 4 10 ± 5 0.88 0.05 0.83 37
Pes,ei (cmH2O) 12 ± 4 14 ± 5 13 ± 4 14 ± 6 0.66 0.01 0.80 37
Pga,ee (cmH2O) 12 ± 6 12 ± 5 18 ± 6 18 ± 7 < 0.001 0.19 0.06 31
Pga,ei (cmH2O) 14 ± 6 14 ± 6 20 ± 6 21 ± 7 < 0.001 0.11 0.04 31
PL,ee (cmH2O) 2 ± 3 2 ± 2 2 ± 3 3 ± 2 0.78 0.15 0.96 37
PL,ei (cmH2O) 10 ± 5 11 ± 5 10 ± 5 10 ± 4 0.03 0.47 0.66 37
PL,ei_Elastance (cmH2O) 16 ± 5 17 ± 6 15 ± 5 15 ± 6 < 0.01 0.46 0.34 37
DPrs (cmH2O) 12 ± 4 12 ± 4 11 ± 3 11 ± 4 < 0.001 0.88 0.65 37
DPcw (cmH2O) 3 ± 1 3 ± 2 3 ± 1 4 ± 1 0.33 0.03 0.42 37
DPL (cmH2O) 9 ± 4 8 ± 4 8 ± 4 7 ± 4 < 0.001 0.34 0.38 37
Est,rs (cmH2O/L) 34 ± 14 35 ± 14 32 ± 14 33 ± 14 0.04 0.46 0.83 37
Est,cw (cmH2O/L) 9 ± 4 10 ± 5 10 ± 3 11 ± 4 0.22 0.01 0.30 37
Est,L (cmH2O/L) 25 ± 15 25 ± 15 22 ± 15 22 ± 15 0.01 0.71 0.64 37
PaCO2 (mmHg) 53 ± 16 55 ± 17 52 ± 14 52 ± 18 0.08 0.12 0.36 36
PaO2/FIO2 ratio (mmHg) 143 ± 28 149 ± 31 172 ± 51 187 ± 53 < 0.001 0.03 0.17 36
EELV (mL) 1359 ± 503 1427 ± 456 1266 ± 391 1328 ± 415 0.01 0.08 0.93 37
  1. Values are mean ± SD
  2. PEEP positive end-expiratory pressure, Paw,ee static end-expiratory pressure of the respiratory system, Paw,ei static end-inspiratory pressure of the respiratory system, Pes,ee static end-expiratory esophageal pressure, Pes,ei static end-inspiratory esophageal pressure, Pga,ee static end-expiratory gastric pressure, Pga,ei static end-inspiratory gastric pressure, PL,ee static end-expiratory transpulmonary pressure, PL,ei static end-inspiratory transpulmonary pressure, PL,ei _Elastance Paw,ei × Est,L/Est,rs, Est,rs, Est,cw, Est,L static elastance, of respiratory system, chest wall and lung, respectively, DPrs, DPcw, DPL driving pressure of respiratory system, chest wall and lung, respectively, EELV end-expiratory lung volume
  3. *Due to incomplete data, some patients were excluded from the analysis