RADIOMETER FLEX ABL90, Справочное руководство

Страница: 248 / 346

8. Parameters ABL90 FLEX reference manual
8-32
Eq. 35 [5,16]:
1
2 2
2 2
tO (a, )- tO (v, )
Shunt( )= 1
tO (A, )- tO (a, )
c T c T
F T
c T c T

 

 
 
where
ctO
2
(a,T): total oxygen in arterial blood at patient temperature
ctO
2
(A,T): total oxygen in alveolar blood at patient temperature
ctO
2
(v– ,T): total oxygen in mixed venous blood at patient temperature
Eq. Description See…
35.1 ctO
2
(a,T) = ctO
2
calculated from equation 25 for arterial pO
2
and sO
2
values at 37
o
C
35.2
 
2 2 2
2
tO (A, ) O ( ) O (A, )
tHb 1- COHb- MetHb O (A, )
c T T p T
c F F s T
  
  
35.3
   
2
-2 4
-1.15 10 -37.0 2.1 10 37.0
2
O ( ) 0.0105e
T T
T


 
     
 
  
35.4 pO
2
(A,T) is calculated from equation 16
35.5 sO
2
(A,T) = S
35.6 S = ODC(P,A,T) Eq. 47
35.7 P = pO
2
(A,T)
35.8
 
pH
A a 1.04 37.0
( )
T
T

    

35.9 T = patient temperature (keyed-in)
35.10
 
 

     

2 3
pH
1.47 10 6.5 10 pH(37) 7.40
( ) T
If sO
2
(a) > 0.97, the default p50(st) (3.578 kPa) will be used to
determine the ODC.
35.11 ctO
2
(v– ,T)  ctO
2
(v– ) at 37
o
C is calculated from
equation 27 for mixed venous blood values of pO
2
and sO
2
.
If no mixed venous sample is measured, the FShunt(T) is
estimated assuming ctO
2
(a,T) –
ctO
2
(v– ,T) = 2.3 mmol/L in equation 35.
Eq. 36 :
2 2
2
O (A) O (a)
RI=
O (a)
p p
p

The calculation requires entering the sample type as "Arterial" or "Capillary".
Eq. 37 :
2 2
2
O (A, ) O (a, )
RI( )=
O (a, )
p T p T
T
p T

The calculation requires entering the sample type as "Arterial" or "Capillary".
FShunt(T)
RI
RI(T)