ABG in Hypothermia

Write about ABG in Hypothermia here.


Very complicated.  Often poorly described.


Essentially due to the biochemistry of it all, a normal pH of 7.37 at 37 degrees becomes 7.65 at 20 degrees.


Therefore for the actual measurement correction (which is controversial) you should add 0.015 pH for every degree under 37.


The Oxygen Saturation Curve


Temperature

pH

PaCO2 kPa (mmHg)

PaO2 kPa (mmHg)

20

7.65

2.533 (19)

3.600(27) 

30

7.50

4.932 (30)

6.799 (51)

35

7.43

4.933 (37)

9.333 (70)

37

7.40

5.333 (40)

10.666 (80)

39

7.37

5.866 (44)

12.132 (91)


760 mmHg = 101.325 kPa.