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Table 2 Ventilation, oxygenation, and hemodynamic variables throughout the first 40 h of the prone positioning

From: Oxygenation improves during the first 8 h of extended-duration prone positioning in patients with respiratory failure: a retrospective study

 

Supine

8 h

16 h

24 h

32 h

40 h

pvalue

HR

89.7 ± 18.2

88.8 ± 20.3

85.6 ± 20.0

89.7 ± 19.0

89.3 ± 22.5

84.3 ± 17.2

0.95

MBP

78.9 ± 14.7

80.6 ± 10.1

77.4 ± 14.4

75.8 ± 14.5

80.1 ± 19.2

75.5 ± 13.9

0.90

FiO2

0.62 ± 0.19

0.50 ± 0.13

0.51 ± 0.12

0.48 ± 0.09

0.46 ± 0.09

0.46 ± 0.09

0.002

PEEP

13.4 ± 6.9

13.5 ± 6.4

13.5 ± 6.4

13.9 ± 6.5

12.9 ± 6.5

12.4 ± 6.0

0.99

PFR

193.8 ± 70.1

274.7 ± 70.7

294.1 ± 78.0

289.0 ± 88.1

294.6 ± 68.2

291.7 ± 72.7

0.002

PaCO2

43.8 ± 7.7

47.5 ± 8.0

46.0 ± 13.6

44.9 ± 10.6

46.3 ± 8.9

47.2 ± 8.5

0.91

  1. Values are expressed as the mean ± standard deviation. ANOVA was used to compare values among the various time points. Supine represents immediately before starting prone positioning. HR heart rate, MBP mean blood pressure, PEEP positive end-expiratory pressure, PFR PaO2/FiO2 ratio.