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Table 2 Change in gas exchange and lung mechanics between survivors and non-survivors for influenza pneumonia-related ARDS

From: Predictors of survival in patients with influenza pneumonia-related severe acute respiratory distress syndrome treated with prone positioning

Parameters 30-day p value 60-day p value
Survivors (n = 48) Non-survivors (n = 17) Survivors (n = 45) Non-survivors (n = 20)
Δ PaO2 (mm Hg) 6.0 ± 53.7 6.6 ± 29.1 0.963 5.2 ± 54.2 8.4 ± 29.0 0.823
Δ PaCO2 (mm Hg) − 4.7 ± 20.4 − 3.4 ± 14.3 0.817 − 5.2 ± 20.4 8.4 ± 29.0 0.823
Δ FiO2 − 15.9 ± 19.6 − 12.9 ± 20.5 0.597 − 17.0 ± 19.8 − 11.0 ± 19.4 0.263
Δ PaO2/FiO2 (mm Hg) 34.7 ± 83.6 30.3 ± 49.7 0.839 35.5 ± 85.9 29.2 ± 47.4 0.706
Δ P(A–a)O2 (mm Hg) − 140.6 ± 173.7 − 94.3 ± 157.5 0.337 − 145.2 ± 175.4 − 90.8 ± 153.2 0.236
Δ Tidal volume (ml/kg PBW) − 0.2 ± 1.6 − 0.5 ± 2.3 0.532 − 0.1 ± 1.6 − 0.6 ± 2.1 0.389
Δ PEEP (cm H2O) 1.0 ± 3.1 1.4 ± 3.5 0.672 1.1 ± 3.2 1.2 ± 3.3 0.913
Δ Peak airway pressure (cm H2O) − 0.5 ± 3.3 1.5 ± 4.1 0.041* − 0.6 ± 3.2 1.5 ± 3.8 0.024*
Δ Dynamic driving pressure (cm H2O) − 1.4 ± 3.3 0.1 ± 2.4 0.106 − 1.5 ± 3.3 0.3 ± 2.4 0.031*
Δ Dynamic compliance (ml/cm H2O) 1.4 ± 7.9 − 2.6 ± 9.0 0.103 2.0 ± 7.7 − 3.2 ± 8.6 0.022*
  1. ARDS acute respiratory distress syndrome, Δ change between before and after prone positioning 1 day, PaO2 partial pressure of oxygen in arterial blood, PaCO2 atrial pressure of carbon dioxide in arterial blood, FiO2 oxygen fraction in air, P(A-a)O2 alveolar–arterial oxygen gradient, PEEP positive end-expiratory pressure
  2. All values are expressed as mean ± SD
  3. *p < 0.05: survivors versus non-survivors