Oxygenation Calculations Flashcards
1
Q
Alveolar Air Equation formula
A
PAO2 = [(Pb-PH2O) x FiO2] - (PaO2 / RQ)
Pb(barometric pressure) = 760mmHg
PH2O(water vapor pressure) = 47mmHg
RQ(respiratory exchange ratio) = 0.8
2
Q
What is normal PAO2
A
99.7mmHg
3
Q
what does the alveolar gas equation measure
A
estimates the partial pressure of oxygen in the alveolus and assess if the lungs are properly transferring oxygen in the blood.
4
Q
Alveolar - Arterial gradient formula
A
P(A-a)O2 = PAO2 - PaO2
5
Q
Arterial to Alveolar ratio formula
A
a/A = PaO2/PAO2
6
Q
P/F ratio
A
PaO2/FiO2
