RADIOMETER ABL800 FLEX - Page 178

ABL800 FLEX Reference Manual 6. Parameters
List of equations, Continued
FHbF
(continued)
Step Description See…
3.
sO
2
(for fetal blood) = ODC (pO
2
,
est
, A,T); Eq.47
where FHbF = 1
4.
cO
2
HbF
est
= sO
2
(fetal blood) × ceHb × FHbF
est
5.
∆F
cc
c
HbF
OHbF OHbF
eHb
est
2meas. 2es
=
t
−
6.
If |∆FHbF
est
| ≥ 0.001, proceed to step 7.
If |∆FHbF
est
| < 0.001, proceed to step 9.
7.
FHbF
est, new
= FHbF
est, old
+ ∆FHbF
est
8.
Return to step 2.
9.
End of iteration. The value for FHbF has converged.
Eq. 50 [8]:
pO
2
(x,T)
The ODC is determined as described in equations 46 - 47 in Oxyhemoglobin
Dissociation Curve.
pO
2
(x) is calculated by a numerical method, using:
Eq. Description See…
50.1
S = ODC(P,A,T) Eq. 47
50.2
(
)
MetHbCOHb1
COHbMetHb1
)(O
i2,
FF
FFS
Ts
−−
−−×
=
Eq. 46.12
50.3
()
MetHbCOHb1)(O
COHb
1
P
)(O
i2,
i2,
FFTs
F
Tp
−−×
+
=
Eq. 46.10
50.4
(
)
)(O)(O+
)(OMetHbCOHb1tHb)(t
i2,2
i2,i
TpT
TsFFcT
×
+
×
−
−
×
=
α
50.5
A = a
50.6
T = patient temperature
50.7
[
]
25
)37(1021)37(115.0
2
00983.0)(αO
−××+−×−
−
×=
TT
eT
Continued on next page
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