Table 3 Effects of modified high-flow tracheal oxygen on gas exchange and hemodynamics.

From: Additional Expiratory Resistance Elevates Airway Pressure and Lung Volume during High-Flow Tracheal Oxygen via Tracheostomy

 

Normal

p

Injured

p

T-piece

HFT

Modified HFT

T-piece

HFT

Modified HFT

FiO2

0.77 ± 0.15

0.40 ± 0.02a

0.41 ± 0.01a

0.002

0.79 ± 0.13

0.41 ± 0.02a

0.40 ± 0.02a

0.001

PaO2 (mmHg)

310 ± 120

173 ± 47a

185 ± 37a

0.019

214 ± 89

113 ± 32a

125 ± 36a

0.010

PaO2/FiO2 ratio

412 ± 164

432 ± 119

457 ± 98

0.228

279 ± 115

276 ± 79

308 ± 77a,b

0.038

PETCO2 (mmHg)

39 ± 4

39 ± 4

40 ± 5

0.350

38 ± 5

40 ± 5

38 ± 3

0.307

PaCO2 (mmHg)

50 ± 5

50 ± 2

50 ± 2

0.968

57 ± 3

53 ± 5

53 ± 2

0.316

Alveolar dead space fraction

0.22 ± 0.10

0.21 ± 0.10

0.19 ± 0.07

0.701

0.33 ± 0.05

0.24 ± 0.07

0.28 ± 0.07

0.075

Mean arterial pressure (mmHg)

119 ± 14

114 ± 13

116 ± 11

0.238

111 ± 25

112 ± 13

116 ± 16

0.737

Heart rate

77 ± 21

68 ± 11

63 ± 8

0.371

73 ± 7

72 ± 7

66 ± 9a

0.041

  1. FiO2: fraction of inspired oxygen; PaO2: partial pressure of oxygen in arterial blood; PaCO2: partial pressure of carbon dioxide in arterial blood,; PETCO2: partial pressure of end-tidal carbon dioxide.
  2. Data are shown as mean ± standard deviation.
  3. aSignificantly different compared with T-piece.
  4. bSignificantly different compared with HFT.