Shunt calculations

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Aortic Saturation AO₂ Saturation

Right Atrial RAO₂ Saturation

Left Atrial  LAO₂ Saturation

Pulmonary Artery (Mixed Venous) PAO₂ saturation

Shunt Qp/Qs=( AO₂ - RAO₂ ) / ( LAO₂ - PAO₂ )    Equation 1

Usually AO₂ = LAO₂

Therefore

Shunt Qp/Qs=( AO₂ - RAO₂ ) / ( AO₂ - PAO₂ )    Equation 2