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.


Oh J, Seward JB, Tajik AJ.

Note to self: we need to find and upload this file.

Kern MJ.

The Cardiac Catheterization Handbook 4th Edition. Mosby 2003

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1. Arterial Oxygen Saturation?

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