Table 1

Carrier gas effect.


O2
 CO2
 N2O
 N2O+CO2
Agent
 Analyzer #
 GC
 IR
 GC
 IR
 GC
 IR
 GC
 IR
isoflurane
 I
 1.24
 1.20
 1.18
 1.15
 1.19
 1.15
 1.22
 1.20

II
 1.05
 1.07
 0.97
 1.01
 1.08
 1.10
 1.18
 1.22

III
 0.95
 0.95
 0.88
 0.86
 1.24
 1.30
 1.11
 1.12

IV
 1.20
 1.17
 0.85
 0.81
 1.14
 1.06
 1.08
 1.00
sevoflurane
 I
 1.90
 1.88
 1.96
 1.90
 0.91
 0.93
 0.88
 0.88

II
 2.01
 1.80
 1.08
 0.99
 1.05
 0.98
 0.98
 0.89

III
 1.71
 1.67
 1.82
 1.80
 0.95
 0.91
 1.03
 1.00

IV
 1.80
 1.64
 1.80
 1.64
 1.05
 0.98
 0.84
 0.77
desflurane
 I
 6.14
 5.90
 5.00
 5.00
 5.95
 6.03
 5.71
 5.40

II
 5.88
 5.64
 5.38
 5.27
 5.86
 5.56
 5.48
 5.37

III
 4.76
 4.80
 6.12
 5.96
 6.76
 6.47
 6.02
 5.54

IV
 5.75
 5.31
 5.29
 5.00
 5.85
 5.40
 5.65
 5.30

Carrier gas composition did not affect IR analysis (P > 0.05), but individual modules within the carrier gas group differed in their accuracy (P = 0.004). GC = gas chromatography (measured value, % of atm); IR = infrared values (measured value, % of atm).

Hendrickx et al. BMC Anesthesiology 2008 8:2   doi:10.1186/1471-2253-8-2