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Table 1 Inspired fraction of oxygen and sevoflurane before, during and after the reservoir bag was disconnected in the case of oxygen and air as the carrier gas

From: Effects of the reservoir bag disconnection on inspired gases during general anesthesia: a simulator-based study

Inspired gas

FGF

Inspired fraction before disconnection of reservoir bag (%)

Inspired fraction during disconnection of reservoir bag (%)

Inspired fraction during reconnection of reservoir bag (%)

P*

Oxygen

0.5

44.00 [41.75–45.00]

Min = 40.00

Max = 46.00

31.50 [30.00–35.25]

Min = 28.00

Max = 45.00

33.00 [31.75–34.25]

Min = 29.00

Max =37.00

< 0.001

1.0

55.00 [54.00–56.00]

Min = 52.00

Max = 58.00

39.50 [38.00–42.50]

Min = 37.00

Max = 49.00

48.00 [43.75–50.00]

Min = 37.00

Max = 52.00

< 0.001

2.0

64.00 [63.00–64.00]

Min = 62.00

Max = 65.00

50.00 [49.00–52.00]

Min = 47.00

Max = 64.00

60.00 [57.50–61.00]

Min = 51.00

Max = 63.00

< 0.001

Sevoflurane

0.5

1.90 [1.80–1.90]

Min = 1.80

Max = 2.00

1.2 [1.10–1.35]

Min = 1.10

Max = 1.80

1.50 [1.40–1.60]

min = 1.10

Max = 1.70

< 0.001

1.0

2.90 [2.80–2.90]

Min = 2.70

Max = 3.00

1.90 [1.90–2.20]

Min = 1.80

Max = 2.70

2.70 [2.37–2.80]

Min = 1.80

Max = 3.00

< 0.001

2.0

4.10 [4.00–4.10]

Min = 4.00

Max = 4.10

3.10 [3.10–3.40]

Min = 3.00

Max = 4.10

3.90 [3.68–4.00]

Min = 3.10

Max = 4.10

< 0.001

  1. *Friedman nonparametric test. Values are expressed as median [25th–75th percentile]
  2. Min minimum, Max Maximum, FGF fresh gas flow (L/min)