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Arterial-Venous Oxygen Content Difference
The arterial-venous oxygen content difference (ctO
between arterial and venous blood. It is a determination of the amount of oxygen released
to the tissues per volume of blood.
When this result is obtained using a mixed venous sample, it is useful as an indicator of
changes in cardiac output and helps to assess the cardiac and metabolic factors affecting
arterial oxygenation.
The system determines the arterial-venous oxygen content difference as follows:
ctO
(a- ) = ctO
2
a-v Extraction Index
The a-v extraction index [ctO
oxygen content difference and can indicate inadequate oxygen content in arterial blood or
inadequate cardiac output to meet oxygen demands of the tissues.
properly determined using arterial blood and mixed venous blood.
The system determines the a-v extraction index as follows:
ctO
([a- ]/a) = [ctO
2
Oxygen Consumption Rate
The oxygen consumption rate ( O
oxygen consumed by the body per minute.
The system determines the oxygen consumption rate as follows:
O
2
Oxygen Delivery
Oxygen delivery ( O
the volume of oxygen per minute that is transported to the tissues.
The system determines oxygen delivery as follows:
O
= ctO
2
02087462 Rev. V
Rapidlab 1200 Operator's Guide: System Overview and Intended Use
9
(a)–ctO
( )
2
2
2
(a- ) / ctO
2
= ctO
(a- ) × Qt × 10
2
), which is also referred to as oxygen transport, refers to
2
(a) × Qt × 10
2
(a- )) refers to the oxygen difference
2
34
([a- ]/a)] aids in the interpretation of the arterial-venous
(a)] x 100
2
) is a determination of the volume of
2
9
9
The value is most
34
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