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Table 4 Peak and late inspiratory and expiratory flow of the lung (PIF, LIF, PEF, LEF) during different parts of the respiratory cycle in different regions-of-interest (ROI)

From: Determination of respiratory gas flow by electrical impedance tomography in an animal model of mechanical ventilation

PIF

Phase 1

Inspiration

 

Global ROI

Ventral ROI$/§

Middle ROI

Dorsal ROI

PEEP [mbar]

VT/weight [ml/kg]

Lung

n

Mean ± sd [ml/s]

Mean ± sd [ml/s]

Mean ± sd [ml/s]

Mean ± sd [ml/s]

0

15

healthy

7

467.27 ± 56.69

109.87 ± 15.45

317.60 ± 34.38

298.54 ± 120.62

0

20

healthy

7

571.94 ± 100.47

126.10 ± 17.69

345.79 ± 54.36

327.13 ± 127.57

5

15

healthy

7

510.92 ± 102.16

116.04 ± 14.20

324.25 ± 73.59

334.11 ± 135.32

5

20

healthy

7

621.80 ± 85.20

129.70 ± 16.65

396.75 ± 50.78

348.89 ± 139.71

10

15

healthy

7

550.89 ± 82.35

105.82 ± 13.13

335.46 ± 48.16

339.63 ± 132.18

10

20

healthy

7

711.67 ± 104.68

123.85 ± 22.84

424.07 ± 84.16

402.98 ± 143.06

5

15

healthy

6

901.90 ± 92.06

118.94 ± 32.59

512.73 ± 81.67

283.00 ± 59.44

5

15

LAV

6

968.55 ± 64.49

158.94* ± 24.26

602.78* ± 91.51

335.89 ± 83.67

LIF

Phase 2

Inspiration

 

Global ROI

Ventral ROI $

Middle ROI

Dorsal ROI

PEEP [mbar]

V T /weight [ml/kg]

Lung

n

Mean ± sd [ml/s]

Mean ± sd [ml/s]

Mean ± sd [ml/s]

Mean ± sd [ml/s]

0

15

healthy

7

72.04 ± 16.52

10.26 ± 5.27

36.77 ± 28.00

19.03 ± 4.99

0

20

healthy

7

86.66 ± 36.51

10.80 ± 4.08

43.22 ± 24.84

17.66 ± 4.93

5

15

healthy

7

55.58 ± 23.32

5.65 ± 4.35

18.02 ± 3.12

16.05 ± 4.31

5

20

healthy

7

52.11 ± 10.05

9.50 ± 4.76

27.59 ± 15.06

10.45 ± 5.20

10

15

healthy

7

47.17 ± 16.57

7.83 ± 3.67

23.31 ± 8.22

11.93 ± 9.44

10

20

healthy

7

64.37 ± 45.81

8.69 ± 4.00

32.91 ± 5.27

18.07 ± 15.34

5

15

healthy

6

13.58 ± 2.70

4.03 ± 0.52

18.55 ± 8.65

12.72 ± 5.84

5

15

LAV

6

19.09* ± 5.14

2.82 ± 1.83

10.74* ± 5.29

13.02 ± 3.73

PEF

Phase 3

Expiration

 

Global ROI

Ventral ROI $/§

Middle ROI

Dorsal ROI

PEEP [mbar]

V T / weight [ml/kg]

Lung

n

Meann ± msd [ml/s]

Mean ± sd [ml/s]

Mean ± sd [ml/s]

Mean ± sd [ml/s]

0

15

healthy

7

-587.38 ± 86.73

-130.15 ± 21.79

-360.79 ± 60.67

-344.81 ± 140.78

0

20

healthy

7

-687.01 ± 138.84

-141.14 ± 24.29

-419.64 ± 68.85

-360.89 ± 135.22

5

15

healthy

7

-609.64 ± 164.78

-122.24 ± 16.87

-359.02 ± 71.82

-351.49 ± 156.67

5

20

healthy

7

-675.96 ± 142.03

-119.51 ± 20.03

-397.41 ± 67.45

-413.33 ± 170.68

10

15

healthy

7

-581.72 ± 119.23

-107.19 ± 13.15

-356.31 ± 53.46

-353.22 ± 127.59

10

20

healthy

7

-685.25 ± 114.72

-108.40 ± 13.30

-395.27 ± 41.11

-383.60 ± 152.15

5

15

healthy

6

-666.61 ± 62.94

-94.05 ± 12.91

-373.52 ± 74.09

-257.96 ± 47.51

5

15

LAV

6

-734.43* ± 44.74

-130.40* ± 26.63

-441.15 ± 102.11

-349.22 ± 145.95

LEF

Phase 4

Expiration

 

Global ROI

Ventral ROI $

Middle ROI §

Dorsal ROI

PEEP [mbar]

V T / weight [ml/kg]

Lung

n

Mean ± sd [ml/s]

Mean ± sd [ml/s]

Mean ± sd [ml/s]

Mean ± sd [ml/s]

0

15

healthy

7

-40.23 ± 25.65

-5.74 ± 4.36

-27.25 ± 14.37

-7.11 ± 5.85

0

20

healthy

7

-58.85 ± 30.50

-8.73 ± 4.94

-48.72 ± 19.19

-16.04 ± 7.86

5

15

healthy

7

-50.20 ± 17.22

-5.41 ± 4.37

-27.87 ± 8.07

-3.74 ± 1.78

5

20

healthy

7

-62.46 ± 37.63

-5.46 ± 2.57

-47.50 ± 13.66

-16.79 ± 10.81

10

15

healthy

7

-49.84 ± 37.89

-3.77 ± 2.04

-23.78 ± 22.54

-9.10 ± 11.72

10

20

healthy

7

-86.42 ± 27.98

-6.67 ± 3.74

-51.34 ± 15.72

-15.81 ± 5.00

5

15

healthy

6

-39.16 ± 23.89

-5.71 ± 3.26

-26.44 ± 10.16

-8.36 ± 4.09

5

15

LAV

6

-36.15 ± 27.84

-6.29 ± 2.20

-20.37 ± 16.26

-2.63* ± 1.00

  1. PEEP: positive end-expiratory pressure. VT/weight: tidal volume per body weight. sd: standard deviation. LAV: lavage injury. Statistical analysis (two-way ANOVA): *p <0.05: comparison to condition above. ROI analysis: $p < 0.05 comparison to middle ROI, §p < 0.05 comparison to dorsal ROI.