The hole allows blood to seep from the left ventricle into the right ventricle. The more blood that is diverted to the right side of the heart, the harder the lungs and right ventricle must work to compensate for the problem. Also, the lungs can become congested upon receiving more blood than is needed. About 50 percent of small VSDs close by themselves by the age of three, with no symptoms or harmful effects. For those that remain, most physicians agree that no matter how small the hole is, it should be treated sooner rather than later especially if other defects are present.
Treatment usually involves surgery.
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