Single Ventricle
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Tricuspid Atresia
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What Are Its Effects?

In Single Ventricle, there is complete mixing of the blood returning from the body with blood returning from the lungs. Therefore, blood leaving the heart through the pulmonary artery will have basically the same oxygen content as that leaving the heart through the aorta on its way to the body.

In the example defect shown (Tricuspid Atresia), oxygen reaches the body tissues immediately after birth because of the Patent Ductus Arteriosus (PDA) as well as any flow that can cross the often narrowed pulmonary artery. When the PDA closes, the infant can become cyanotic ("blue"), with insufficient blood flow to the lungs and inadequate oxygen supply to the body.