Physics - Physiological models Flashcards
1
Q
What is Fick’s principle?
A
During any time interval, the quantity of a substance entering a compartment in the inflowing blood must equal the sum of the accumulation in the compartment and the quantity leaving in the efferent blood.
2
Q
What is the shunt equation?
A
Qs/QT = (CcO2 - CaO2) - (CcO2 - CVO2)
3
Q
What is the equation for VO2?
A
VO2 = Q x (CaO2 - CvO2)
Where Q = pulmonary blood flow
CaO2 is arterial oxygen content
CvO2 is venous oxygen content
4
Q
What is a normal value for Qs/QT (i.e. a normal shunt fraction)?
A
Around 5%
