What causes it?
In most children, the cause isn’t known. Some children can have other heart defects along with TAPVC. How does it affect the heart?
In the right atrium, oxygen-rich (red) blood from the pulmonary veins mixes with low-oxygen (bluish) blood from the body. Part of this mixture passes through the atrial septum (atrial septal defect) into the left atrium. From there it goes into the left ventricle, then into the aorta and out to the body. The rest of the blood flows through the right ventricle, into the pulmonary artery and on to the lungs. The blood passing through the aorta to the body doesn’t normal amount of oxygen, which causes the child to look blue.
How does TAPVR affect my child?
Symptoms may develop soon after birth. In other children, symptoms may be delayed.
This partly depends on whether the lung veins are blocked as they drain toward the right
atrium. Severe obstruction of the pulmonary veins tends to make infants breathe harder
and look bluer (have lower oxygen levels) than infants with little obstruction.