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Table 2 Respiratory mechanics, arterial blood gases, and hemodynamics

From: Lung ultrasound to evaluate aeration changes in response to recruitment maneuver and prone positioning in intubated patients with COVID-19 pneumonia: preliminary study

Parameters

Supine (n.20)

Recruitment (n.20)

Prone (n.20)

P value

Respiratory mechanics

 Respiratory system compliance (ml/cmH2O)

38.5 (28.5–48.0)

32.0 (27.0–45.0)

37.0 (31.0–48.5)

0.377

 Respiratory system driving pressure (cmH2O)

13.0 (10.0–16.0)

25.0 (23.0–25.0)a

13.5 (9.8–16.0)b

 < 0.001

 Plateau pressure (cmH2O)

24.0 (20.0–27.0)

35.0 (35.0–35.0)a

24.0 (21.0–26.3)b

 < 0.001

 Tidal volume (ml/kg)

6.7 (6.4–7.0)

11.2 (9.5–14.9)a

6.6 (6.1–6.9)b

 < 0.001

 Mechanical respiratory rate (breaths/min)

22.0 (20.0–24.3)

10.0 (10.0–10.0)a

21.0 (20.0–24.3)b

 < 0.001

Arterial blood gases

 PaO2/FiO2 (mmHg)

111.0 (80.3–139.0)

114.0 (95.5–189.0)c

156.0 (139.0–204.0)a,d

 < 0.001

 PaCO2 (mmHg)

57.0 (44.0–68.3)

51.0 (43.5–56.0)a

50.5 (42.8–61.0)e

 < 0.001

 pH

7.36 (7.28–7.39)

7.39 (7.34–7.44)a

7.37 (7.31–7.43)f

 < 0.001

Hemodynamics

 Mean arterial pressure (mmHg)

88.0 (74.0–93.3)

80.0 (72.5–87.0)

82.5 (79.8–88.5)

0.264

 Heart rate (beats/min)

81.5 (60.0–101.0)

77.5 (60.8–104.0)

81.5 (68.5–101.0)

0.499

  1. Data are presented as median and 25th–75th percentile
  2. PaO2/FiO2 partial arterial oxygen tension on inspired oxygen fraction ratio, PaCO2 partial arterial carbon dioxide tension
  3. avs supine, p < 0.001
  4. bvs recruitment, p < 0.001
  5. cvs supine, p = 0.022
  6. dvs recruitment, p = 0.008
  7. evs supine, p = 0.010
  8. fvs supine, p = 0.013