Truncus arteriosus

Truncus arteriosus

If you or your baby has truncus arteriosus, one large vessel leads out of the heart, instead of two separate vessels, and there's a hole in the wall between the ventricles (ventricular septal defect). The oxygen-rich blood (red) and the oxygen-poor blood (blue) mix together, resulting in blood with an insufficient oxygen supply (purple) for the body.

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