Respiratory Index - Siemens Rapidlab 1200 Operator's Manual

Rapidlab 1200 Operator's Guide: System Overview and Intended Use

Respiratory Index

The respiratory index (RI(T)) is the ratio of the alveolar-arterial blood
oxygen-pressure difference to arterial pO
for patient temperature. This index is also a means of assessing the degree of
pulmonary shunting.
The system determines respiratory index as follows:
RI(T) = pO
where pO
difference and pO
blood.
Arterial-Venous (a-v) Study
This section describes the parameters associated with an a-v study.
Arterial Oxygen Content
The oxygen content of arterial blood [ctO
oxygen carried by the arterial blood, including the oxygen bound to hemoglobin
and the oxygen dissolved in plasma and in the fluid within the red blood cells.
The system determines the oxygen content of arterial blood, based on CLSI
recommendations
ctO (a) = (OBF × tHb × FO
2
where OBF is the O
whatever value is entered as the default value in Setup. FO
format.
Mixed Venous Oxygen Content
The oxygen content of mixed venous blood [ctO
total oxygen carried by the mixed venous (pulmonary artery) blood, including the
oxygen bound to hemoglobin and the oxygen dissolved in plasma and in the fluid
within the red blood cells.
The system determines the oxygen content of mixed venous blood, based on CLSI
recommendations
ctO ( ) = (OBF × ctHb × FO
2
where OBF is the O
whatever value is entered as the default value in Setup. FO
format.
19
(A-a)(T) / pO (a)(T) × 100
2 2
(A-a)(T) is the temperature-corrected alveolar-arterial oxygen tension
2
(a)(T) is the temperature-corrected oxygen tension of arterial
2
19
as follows:
Hb) + (0.00314 × pO
2
binding factor. The system uses the default value of 1.39, or
2
19
as follows:
Hb) + (0.00314 × pO
2
binding factor. The system uses the default value of 1.39, or
2
, when both values are corrected
2
(a)] is a determination of the total
2
)
2
Hb is in decimal
2
( )] is a determination of the
2
)
2
Hb is in decimal
2
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02087462 Rev. V