RADIOMETER ABL800 FLEX - Page 166

ABL800 FLEX Reference Manual 6. Parameters
List of equations, Continued
ctCO
2
(B)
Eq. 11 [5]:
(
)
[
]
⎟
⎠
⎞
⎜
⎝
⎛
−×+
××××=
−
−
0.21
tHb
1)P(tCO
10+1tHbCO10286.9)B(tCO
2
KpH
2
3
2
EryEry
c
c
cpc
p
where
Eq. Description
9.1
(
)
(
)
pH pH -7.40 O
Ery 2
=+× + ×−7 19 0 77 0 035 1.. . s
9.2
()
[
]
pK log 1+10
Ery
pH O
Ery 2
=−
−−×
6125
784 006
.
..s
Eq. 12 [14]:
pH(st)
pH(st): see equations 5.3 - 5.5.
Eq. 13 [15]:
Hct
Hct = 0.0485×
ctHb + 8.3×10
-3
Hct cannot be calculated on the basis of a default ctHb value.
pO
2
(T)
Eq. 14 [16,17]:
The standard Oxygen Dissociation Curve (ODC) is used (i.e.
p50(st) = 3.578 kPa) at
actual values of pH,
pCO
2
, FCOHb, FMetHb, FHbF (see equations 46 - 47 in the
section
Oxyhemoglobin Dissociation Curve).
pO
2
(T) is calculated by a numerical method using:
( )
t ( ) tHb 1- COHb - MetHb O O O
i 2,i 2 2,i
Tc F F s T T p T=× × + ×() () () α
where
Eq. Description See…
14.1
S = ODC(P,A,T) Eq. 47
14.2
(
)
sT
FF
O()=
S 1- MetHb COHb
1- COHb - MetHb
2,i
×−
F
F
Eq. 46.12
14.3
( )
pT
F
sT F F
O()=
P
COHb
O ( ) COHb MetHb
2,i
2
1
1
,i
+
×− −
Eq. 46.10
Continued on next page
6-29