User's Manual

Ultraview Care Network
25-14
Calculating O
2
AV, O
2
AVI, VO
2
, and VO
2
I requires a CO value to complete the
calculations. The most recent CO value (less than 15-minutes old) is used for
these calculations if it is available.
Table 9: Oxygenation Output
Label Name Units
CTaO
2
Arterial Oxygen Content ml/dl
CTvO
2
Venous Oxygen Content ml/dl
avDO
2
Arteriovenous Oxygen Content difference ml/dl
O
2
AV Oxygen Availability ml/min
O
2
AVI Oxygen Availability Index ml/min/m
2
VO
2
Oxygen Consumption ml/min
VO
2
I Oxygen Consumption Index ml/min/m
2
O
2
ER Oxygen Extraction Ratio None
PAO
2
Partial Pressure of Alveolar Oxygen
mmHg
kPa
Qs/Qt Pulmonary Venous Admixture Shunt %
P/F PaO
2
/FiO
2
ratio None
Table 10: Oxygenation Equations
CTaO
2
= (1.34 x Hgb x SpO
2
100) + (0.0031 x PaO
2
)
CTvO
2
= (1.34 x Hgb x SvO
2
/100) + (0.0031 x PvO
2
)
avDO
2
= CTaO
2
- CTvO
2
O
2
AV = CTaO
2
x CO x 10
O
2
AVI = O
2
AV/BSA
VO
2
= avDO
2
x CO x 10
VO
2
I = VO
2
/BSA
O
2
ER = (CTaO
2
- CTvO
2
)/CTaO
2
PAO
2
= [(FiO
2
/100) x (PB*-47)] - PaCO
2
/0.8
Qs/Qt
= 100 x
[(1.34 x Hgb) + (0.0031 x PAO
2
) - CTaO
2
]
[(1.34 x Hgb) + (0.0031 x PAO
2
) - CTvO
2
]
* PB = Barometric Pressure