The right atrium is one of the four chambers of the heart. The heart is comprised of two atria and two ventricles. Blood enters the heart through the two atria and exits through the two ventricles.
An atrial septal defect is a congenital heart issue. According to the Centers for Disease Control and Prevention (CDC), it develops in about 1 in 1,859 babies in the United States. An atrial septal ...
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