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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.