Atrioventricular Septal Defect, Complete
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Atrioventricular Septal Defect What Are Its Effects?

Atrioventricular Septal Defect, which often occurs in conjunction with Down Syndrome, allows the blood to move freely between the four chambers of the heart.

With this physiology, two different scenarios can occur. In some infants, resistance in the pulmonary arteries remains high. Therefore, even though there are large defects in the heart that allow the mixing of blood, the infants will have very little murmur and no symptoms.

In the other scenario, resistance in the lung arteries falls normally after birth. This allows an excess of blood to pass to the lungs and can cause heart failure, rapid breathing, and poor feeding.

This defect almost invariably requires surgical correction within a few months after birth.