Table of Contents
Advertisement
Alveolar Oxygen (A)
Alveolar Oxygen refers to the partial pressure of oxygen in
alveolar gas. It is calculated as follows:
%FIO
2
––––– (B.P. - 0.045T2 + 0.84T - 16.5) -
A =
100
where
B.P. = barometric pressure
%FIO
** Temperature corrected gas value
Arterial Alveolar Oxygen Tension Gradient (AaDO
The arterial alveolar oxygen tension gradient is a useful
index of gas exchange within the lungs and is defined as:
Aa DO
** Temperature corrected gas value
NOTE: For capillary samples, AaDO2 results have an
asterisk (*). AaDO2 results are dependent on how
the samples are drawn and handled, thus care
must be taken when interpreting these calculated
results.
[
%FIO
**PCO2 –––––– + –––––––––
T = patient temperature
= fraction inspired oxygen, as a percent
2
P
**
= A-
O
2
2
Appendix B
(
1-(%FIO2/100)
2
100
0.8
Equation 26
Equation 27
]
)
)
2
B-11
Hide quick links:
Advertisement
Table of Contents
