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Table 2 Baseline patient data

From: “Low-” versus “high”-frequency oscillation and right ventricular function in ARDS. A randomized crossover study

Age (years) 60.6 ± 15.2
Sex (male/female), n 13/4
Body mass index (kg/m2) 24.5 ± 1.9
Predicted body weight (kg) 69.8 ± 7.2
Simplified Acute Physiology Score IIa 42.9 ± 11.2
Murray scorea 3.4 ± 0.3
Tracheal tube ID (for male/female patient) (mm)a 8.5/8.0
Ventilator mode Volume assist-control
Inspiratory-to-expiratory time ratioa 1/2
FiO2 (%)a 61.2 ± 9.4
PEEPe (cmH2O)a 14.7 ± 1.9
Tidal volume (L)/(mL/kg predicted body weight)a 0.44 ± 0.46/6.3 ± 0.4
Square-wave inspiratory flow (L/s)a 0.67 ± 0.07
Peak airway pressure (cmH2O)a 43.0 ± 6.2
Plateau airway pressure (cmH2O)a 30.4 ± 4.4
Mean airway pressure (cmH2O)a 21.6 ± 2.7
PEEPi (cmH2O)a 1.0 ± 0.6
Driving pressure (cmH2O)b 14.7 ± 4.0
C,rs (mL/cmH2O)b 32.4 ± 10.1
Rtot,rs (cmH2O/L.s)b 18.5 ± 4.8
ΔEELV (mL)b 31.0 ± 19.8
SpO2 (%) 91.2 ± 1.9
PaO2/FiO2 108.4 ± 15.0
PaCO2 (kPa) 6.5 ± 1.5
Arterial pH 7.35 ± 0.10
Oxygenation index 20.5 ± 5.0
Time from ARDS diagnosis to study enrollment (h) 42.0 ± 11.2
ARDS etiology
 Hospital-acquired pneumonia, n (%) 11 (64.7)
 Community-acquired pneumonia, n (%) 2 (11.8)
 Intra-abdominal sepsis, n (%) 2 (11.8)
 Other, n (%)c 2 (11.8)
  1. Values are mean ± SD unless otherwise specified. For males, predicted body weight was calculated as 50 + [height (cm) − 152.4] × 0.91; for females as 45.5 + [height (cm) − 152.4] × 0.91
  2. ID internal diameter, FiO2 inspired oxygen fraction, PEEPe external positive end-expiratory pressure, PEEPi intrinsic positive end-expiratory pressure, C,rs respiratory system compliance, Rtot,rs respiratory system resistance ΔEELV chang e in end-expiratory lung volume due to PEEPi, PaO2 arterial oxygen tension, SpO2 peripheral oxygen saturation, PaCO2 arterial carbon dioxide tension, ARDS acute respiratory distress syndrome, MOF multiple organ failure
  3. aVariables determined/recorded within 1 h before study enrolment
  4. bVariables calculated according to standard formulas presented in Additional file 1
  5. cIncludes one case of bilateral pulmonary contusions and one case of massive blood transfusion