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Table 1 Effects of the speed of CO2 transport on the time constant

From: Extremely low flow tracheal gas insufflation of helium-oxygen mixture improves gas exchange in a rabbit model of piston-type high-frequency oscillatory ventilation

Insufflating gas

Non-linear regression

b

Time constant = 1/|b|

Helium-oxygen

y = 91.641e-0.4848x

−0.4848

2.06

y = 91.24e-0.4986x

−0.4986

2.01

y = 89.045e-0.4748x

−0.4748

2.11

y = 91.327e-0.4936x

−0.4936

2.03

y = 93.579e-0.4859x

−0.4859

2.06

y = 92.799e-0.492x

−0.492

2.03

 

mean ± SD 2.05 ± 0.04

Nitrogen-oxygen

y = 94.984e-0.436x

−0.436

2.29

y = 94.806e-0.436x

−0.436

2.29

y = 94.334e-0.436x

−0.436

2.29

y = 95.175e-0.4367x

−0.4367

2.29

y = 93.381e-0.4321x

−0.4321

2.31

y = 96.175e-0.437x

−0.437

2.29

 

mean ± SD 2.3 ± 0.01

Bias flow gas

Non-linear regression

b

Time constant = 1/|b|

Helium-oxygen

y = 101.18e-0.182x

−0.182

5.49

y = 100.9e-0.181x

−0.181

5.52

y = 99.006e-0.1774x

−0.1774

5.64

y = 100.35e-0.1807x

−0.1807

5.53

y = 101.64e-0.1797x

−0.1797

5.56

y = 99.601e-0.1771x

−0.1771

5.65

 

mean ± SD 5.57 ± 0.06

Nitrogen-oxygen

y = 99.37e-0.1925x

−0.1925

5.19

y = 98.925e-0.1801x

−0.1801

5.55

y = 100.75e-0.1751x

−0.1751

5.71

y = 99.517e-0.1738x

−0.1738

5.75

y = 100.72e-0.1733x

−0.1733

5.77

y = 96.836e-0.1912x

−0.1912

5.23

 

mean ± SD 5.54 ± 0.26