Table 4 Mean (± standard deviation) venous blood gas results at two time points (BL = baseline; A = 60 min after inhalant initiation) of 20 dogs undergoing anaesthesia and elective orthopaedic surgery

pH

7.31–7.48

7.35 ± 0.05

7.26 ± 0.05^a

0.1

< 0.001

PvCO2

mmHg

27.8–47.2

40.0 ± 7.7

55.0 ± 8.3^a

-16.7

< 0.001

PvO2

mmHg

50.5 ± 7.8

144.0 ± 101.4^a

-56.0

< 0.001

BE

mmol/L

(-5)-(0)

-3.6 ± 2.9

-2.6 ± 2.7

-1

0.01

HCO3

mmol/L

18.3–26.4

22.1 ± 2.9

24.5 ± 2.3^a

-2.9

< 0.001

TCO2

mmol/L

19–28

23.3 ± 3.1

26.2 ± 2.6^a

-3

< 0.001

sO2

%

82.3 ± 7.2

95.3 ± 5.3^a

-12

< 0.001

Na + 

mmol/L

138–146

144.9 ± 2.6

143.7 ± 2.6

1

0.07

K + 

mmol/L

3.4–4.7

4.0 ± 0.4

4.1 ± 0.4

0.1

0.57

iCa

mmol/L

1.19–1.40

1.4 ± 0.1

1.5 ± 0.1^a

-0.1

0.07

Glu

mg/dL

74–123

109 ± 24

126 ± 27

-6

0.06

PCV

SI

0.39–0.58

44.6 ± 3.3

35.4 ± 3.9^a

0

< 0.001

Hb

g/dL

12–19

14.9 ± 1.6

11.3 ± 1.2^a

3.4

< 0.001

Lac

mmol/L

0.6–2.9

1.3 ± 0.5

1.1 ± 0.5

0.2

< 0.001