8. Parameters ABL90 FLEX reference manual
8-18
Symbol Definition Type Eq.
Q
·
t
Cardiac output; volume of blood delivered from
the left ventricle into the aorta per unit of time.
Also termed CO or C.O.
dv/in 32
V
·
O
2
Oxygen consumption; total amount of oxygen
utilized by the whole organism per unit of time.
dv/in 33
FO
2
(I) Fraction of oxygen in dry inspired air. in
FShunt Relative physiological shunt or concentration-
based shunt [5,8,9].
Calculated from the pulmonary shunt
equation:
s
2
t
22
Q
1
tO (a v)
Q
1
tO (A) tO (a)
c
cc
if both arterial and mixed venous blood
samples are used.
May be estimated from one arterial
sample by assuming a constant difference
in the concentrations of total oxygen in
arterial and mixed venous blood:
2
tO (a v) 2.3 mmol/L (5.15 mL/dL)c
dv 34
FShunt (T) FShunt at patient temperature. dv 35
RI Respiratory Index; ratio between the oxygen
tension difference of alveolar air and arterial
blood and the oxygen tension of arterial blood.
dv 36
RI(T) Respiratory Index; ratio between the oxygen
tension difference of alveolar air and arterial
blood and the oxygen tension of arterial blood
at patient temperature.
dv 37
VO
2
/V(dry
air)
Volume fraction of oxygen in dry air. dv 52
Q
x
Cardiac oxygen compensation factor of arterial
blood defined as the factor by which the
cardiac output should increase to allow release
of 2.3 mmol/L (5.1 mL/dL) oxygen at a mixed
venous pO
2
of 5.0 kPa (38 mmHg) [5,8].
dv 38
V(B) Volume of blood, calculated when FCOHb and
V(CO) values are keyed in [5].
dv 42
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