Medica EasyStat - System Specifications; Performance Data and Limits

104
p r i n c i p l e s o f o p e r a t i o n / t h e o r y
r
Calculations
Temperature Corrections
The measured results are often corrected to the patient body tempera-
ture. The temperature corrected results more accurately reflect the in
vivo conditions. The EasyStat analyzer performs these calculations
using the following equations
1
:
∆pH/∆T = 0.0065 (7.4 - pH) - 0.0147
∆log PCO
2
= 0.019
∆log PO
2
= 5.49 x 10
-11
(PO
2
3.88
) + 0.071
where: ∆T is expressed in °C
PCO
2
and PO
2
are expressed in mmHg
pH is expressed in pH units
∆T
∆T
9.72 x 10
-9
(PO
2
3.88
) + 2.30