OPTi CCA-TS2, Руководство оператора, Страница: 281 / 299

Operator’s Manual – OPTI CCA-TS2 A-9
APPENDIX A - TECHNICAL SPECIFICATIONS
st.HCO
3
-
Standard bicarbonate of the blood, defined as the plasma bicarbonate concentration in blood
which has been equilibrated at 37 ºC with a gas mixture having a
P
CO
2
= 40 mmHg.
( )
st.HCO 10
3
st.pH 6.022 − −
=
[mmol/L]
6
tCO
2
Total concentration of CO
2
in plasma, the sum of dissolved CO
2
and bicarbonate.
tCO HCO (0.0307 CO )
2 3 2
= + ⋅
−
P
[mmol/L]
7
BE
The base excess of the blood results from a calculation to determine the titratable base of the
blood, which in principle is measured by titration of the blood with a strong acid or base to a pH
of 7.4 with P CO
2
= 40 mmHg at 37 ºC.
( )( )
[ ]
−
+ − − ⋅ + ⋅ ⋅ ⋅ − =
3
HCO 24.8 7.4 pH 7 . 7 tHb 43 . 1 tHb) 0.014 (1 BE
[mmol/L]
7
BE
ecf
The base excess of extracellular fluid is a quantity that reflects only the non-respiratory
components of acid-base balance (tHb = 5 g/dL).
( )
−
+ − − ⋅ =
3 ecf
HCO 8 . 24 4 . 7 pH 2 . 16 BE
[mmol/L]
7
BE
(act)
Base excess at actual oxygen saturation.
( ) ( ) ( )
[ ]





 −
⋅ ⋅ −
+ − − ⋅ + ⋅ ⋅ ⋅
−
100
O
1 tHb 2 . 0
HCO 26 . 24 4 . 7 pH 5 . 9 tHb 63 . 1 tHb 0.0143 - 1 = BE
2
3 (act)
S
[mmol/L ]
8
7
CLSI. Blood Gas and pH Analysis and Related Measurements; Approved Guideline. NCCLS document C46-A,
2001.
8 Zander R., Die korrekte Bestimmung des Base Excess (BE mmol/l) im Blut. Anesthesiol. Intensivmed. Notfallmed.
Schmerzther.