RADIOMETER ABL800 FLEX, Справочное руководство

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6. Parameters ABL800 FLEX Reference Manual
General information
The Deep
Picture
TM
The Deep Picture developed by Radiometer [1], (visit our website www.deep-
picture.com) expands traditional pH and blood gas analysis by evaluating the
capability of arterial blood to carry sufficient oxygen to tissues and to release it. It
simplifies interpretation by dividing the process into three stages:
Stage Description
Oxygen
Uptake
Oxygen uptake in the lungs indicates whether the pulmonary gas
exchange is efficient enough to oxygenate arterial blood.
The uptake of oxygen in the lungs can be described by parameters
in combination, primarily the arterial oxygen tension (
p
O
2
(a)),
fraction of O
2
in dry inspired air (
F
O
2
(I)), and shunt fraction of
perfused blood (Q
s
·
/Q
·
t
)
However other parameters may also be used, such as the
difference in alveolar air and arterial blood oxygen tension
(
p
O
2
(A-a)).
Oxygen
Transport
Oxygen transport reveals whether arterial blood contains sufficient
oxygen.
The oxygen concentration of arterial blood (
c
tO
2
(a)) also termed
oxygen content is determined by the concentration of total
hemoglobin (
c
tHb(a)), the fraction of oxygenated hemoglobin
(
F
O
2
Hb(a)), and the arterial oxygen tension (
p
O
2
(a)).
Other parameters which should be known are the oxygen saturation
(
s
O
2
(a)) and the fractions of dyshemoglobins (
F
COHb(a) and
F
MetHb(a)).
Oxygen
Release
Oxygen release describes the ability of arterial blood to release
oxygen to the tissues.
The release of oxygen from capillaries to tissues is determined by
the oxygen tension gradient between the two. This release of
oxygen is also influenced by the hemoglobin-oxygen affinity,
which is indicated by the oxygen tension at 50 % saturation,
p
50.
Symbols
The symbols for the parameters are based on the principles described by Wandrup [2].
Each symbol consists of three parts, described below:
1.
Quantity
A symbol in italics
describing the quantity
p
for pressure
c
for concentration
F
for fraction
V
for volume
etc.
2. Component An abbreviation of the
component name
O
2
for oxygen
CO
2
for carbon dioxide
COHb for carboxyhemoglobin,
etc.
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