Shunt Fraction (Invasive)
*If a pulmonary vein has not been entered the arterial saturation (SAO2) may be substituted, provided that there is no right to left shunt.
The magnitude of an inra- or extracardiac shunt can be estimated by flow ratio between the pulmonary and systemic circulation (Qp/Qs) using hemodynamic data.
Consideration should be made to close shunts with flow rates > 1.5 if no contraindications exist.
Sanders SP et al.
Oh J, Seward JB, Tajik AJ.