RADIOMETER FLEX ABL90, Reference Manual

Page: 233 / 346

ABL90 FLEX reference manual 8. Parameters
8-17
Symbol Definition Type Eq.
p50(st) Partial pressure (or tension) of oxygen at half
saturation (50 %) in blood at standard
conditions: temperature = 37 °C
pH = 7.40
pCO
2
= 5.33 kPa
FCOHb, FMetHb, FHbF set to 0
p50(st) may, however, vary due to variations
in 2,3-DPG concentration or to the presence
of abnormal hemoglobins.
dv 21
pO
2
(A  a) Difference in the partial pressure (or tension)
of oxygen in alveolar air and arterial blood.
Indicates the efficacy of the oxygenation
process in the lungs.
dv 22
pO
2
(A  a,T) Difference in the partial pressure (or tension)
of oxygen in alveolar air and arterial blood at
patient temperature.
dv 23
pO
2
(a/A) Ratio of the partial pressure (or tension) of
oxygen in arterial blood and alveolar air.
Indicates the efficacy of the oxygenation
process in the lungs.
dv 24
pO
2
(a/A,T) Ratio of the partial pressure (or tension) of
oxygen in arterial blood and alveolar air at
patient temperature.
dv 25
pO
2
(x) or p
x
Oxygen extraction tension of arterial blood.
Reflects the integrated effects of changes in
the arterial pO
2
(a), ctO
2
and p50 on the ability
of arterial blood to release O
2
to the tissues
[8].
dv 26
pO
2
(x,T) or
p
x
(T)
Oxygen extraction tension of arterial blood at
patient temperature. dv 50
ctO
2
(B) Total oxygen concentration of blood.
Also termed O
2
content.
dv 27
ctO
2
(a  v
–
)
Oxygen concentration difference between
arterial and mixed venous blood.
dv 28
BO
2
Hemoglobin oxygen capacity; the maximum
concentration of oxygen bound to hemoglobin
in blood saturated, so that all deoxyhemoglobin
is converted to oxyhemoglobin.
dv 29
ctO
2
(x) Extractable oxygen concentration of arterial
blood.
Defined as the amount of O
2
that can be
extracted per liter of arterial blood at an
oxygen tension of 5.0 kPa (38 mmHg),
maintaining constant pH and pCO
2
[8].
dv 30
D
·
O
2
Oxygen delivery; the total amount of oxygen
delivered to the whole organism per unit of
time.
dv 31