Table 3 Time courses and comparison of arterial blood gas and vital sign variables.

From: Noninvasive ventilation with a helmet in patients with acute respiratory failure caused by chest trauma: a randomized controlled trial

 

NIV 1 h

NIV 4 h

The end of NIV

Helmet (n = 29)

Face mask (n = 30)

Helmet (n = 29)

Face mask (n = 30)

Helmet (n = 29)

Face mask (n = 30)

PaO2/FiO2

253.14 ± 64.74a,b

216.06 ± 43.86a

267.04 ± 86.73a

229.41 ± 75.10a

277.07 ± 84.89a,b

225.81 ± 63.64a

PaCO2 (mmHg)

38.79 ± 3.74

37.99 ± 4.56

38.87 ± 4.46

36.31 ± 5.05

38.76 ± 4.60

36.70 ± 5.08

Arterial pH

7.41 ± 0.05

7.43 ± 0.05

7.42 ± 0.03

7.45 ± 0.05

7.43 ± 0.04

7.45 ± 0.05

RR (breaths/min)

18.10 ± 4.13a,b

20.33 ± 2.54a

17.69 ± 3.09a,b

20.07 ± 2.86a

17.10 ± 2.97a,b

19.30 ± 2.04a

HR (breaths/min)

94.48 ± 19.34

92.50 ± 12.66

91.93 ± 17.46

90.53 ± 10.66

90.79 ± 17.73

89.50 ± 9.12

SBP (mmHg)

121.34 ± 15.08

129.73 ± 10.93

122.38 ± 15.76

129.83 ± 12.26

122.79 ± 15.11

130.47 ± 11.60

  1. PaO2/FiO2 the ratio of partial pressure of oxygen in arterial blood to fraction of inspired oxygen, NIV noninvasive ventilation, PaCO2 arterial partial pressure of carbon dioxide, RR respiratory rate, HR heart rate, SBP systolic blood pressure.
  2. aThe differences of outcomes between at baseline and corresponding time point were statistically significant (P < 0.05).
  3. bCompared with the face mask, the helmet significantly increased PaO2/FiO2 or decreased RR at corresponding time point.
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