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Table 4 Intraoperative data on xenon consumption during wash-in, maintenance and overall consumption

From: Xenon consumption during general surgery: a retrospective observational study

 

All

ECO Mode

AUTO Mode

MANUAL Mode

p-value

 

(n = 48)

(n = 11)

(n = 26 )

(n = 11 )

 

Xenon wash-in phase:

             

Duration of wash-in (min)

11.5

±

2.7

13.7

±

2.8

11.0

±

1.7§

10.2

±

3.2§§

0.002

Denitrogenation (min)

9.3

±

4.3

8.1

±

4.7

9.6

±

3.4

9.9

±

5.8

0.556

Total xenon consumption (l)

9.4

±

2.1

8.6

±

0.9

8.9

±

0.9

11.1

±

3.7*§§

0.005

Maintenance of anaesthesia:

             

Time of maintenance (min)

115

±

44

111

±

30

113

±

53

123

±

30

0.781

Total xenon consumption (l)

15.0

±

11.1

9.9

±

3.6

15.7

±

11.9

18.5

±

12.8

0.172

Mean xenon usage (l/hour)

7.5

±

3.6

5.2

±

1.1

7.8

±

2.6§

8.9

±

6.0§

0.049

Mean FiO2 concentration (Vol%)

34.6

±

2.6

34.9

±

1.4

33.8

±

2.6

36.2

±

2.7*

0.029

Mean expiratory xenon concentration

58.2

±

3.0

55.9

±

2.4

59.7

±

2.7§§

57.0

±

2.5*

0.000

Overall xenon consumption:

             

Time of anaesthesia (min)

142.8

±

44.1

142.6

±

32.4

135.0

±

51.0

161.3

±

32.4

0.258

Time of xenon application (min)

126

±

44

125

±

32

124

±

53

133

±

30

0.842

Xenon usage 1st hour (l/min)

0.268

±

0.121

0.205

±

0.030

0.263

±

0.082

0.347

±

0.202 §

0.020

Xenon usage 2nd hour (l/min)

0.128

±

0.042

0.098

±

0.030

0.143

±

0.042§

0.115

±

0.035

0.007

Xenon usage 3rd hour (l/min)

0.098

±

0.056

0.080

±

0.043

0.112

±

0.050§

0.085

±

0.077

0.042

Mean xenon consumption (l/hour)

11.9

±

4.0

9.2

±

1.9

12.5

±

2.6

13.4

±

6.7§

0.031

Total xenon consumption (l)

24.4

±

11.4

18.5

±

3.7

24.7

±

11.5

29.6

±

14.3§

0.033

  1. Data are presented as mean ± SD (normally distributed data). Bold italic P-values indicate significant difference between the groups (p > 0.05), §(§) = p < 0.05(0.01) vs. ECO, *(*) = p < 0.05(0.01) vs. AUTO.