Abstract. The pulmonary shunt

What is a normal QS QT?

A normal Qs/Qt is . 05….in other words, 5 % of the blood that travels from the lungs to the left side of the heart arrives without picking up oxygen. Qs/Qt represents the pooled average of blood from all regions of the lungs.

What increases shunt?

Improvement of the shunt fraction can be accomplished by decreasing blood flow or supplying O2 to the nondependent lung. Hypoxic pulmonary vasoconstriction is a powerful reflex that increases the PVR of the hypoxic lung and the atelectatic lung, diverting blood to the well-oxygenated areas of lung.