Gas exchange is limited by either blood flow or ventilation within the lungs. The Classic Shunt Equation is the percentage if blood flow that is not exposed to inhaled gas.
Qs/Qt = (CcO2 – CaO2)/(CcO2 -CvO2) * 100
Classic Shunt Equation, Qs/Qt Calculation
|Oxygen Content Pulmonary Capillary (CcO2):|
|Oxygen Content of Arterial Blood (CaO2):|
|Mixed Venous Oxygen Content (CvO2):|
|Classic Shunt Equation (Qs/Qt):||%|
Understanding the meaning of the shunt fraction calculation . Retrieved Dec 5, 2014