Atrioventricular Septal Defect
Pronounced: A-tree-o-ven-TREAH-q-lar sep-TAL DEE-fectEn Español (Spanish Version)
The heart is divided into four chambers that help circulate blood through the body. The top two chambers are called atria. The bottom two chambers are called ventricles. Two valves are between the upper and lower chambers. Tissue called the septum divides the chambers. The tissue grows as the fetus develops.
An atrioventricular septal defect is present at birth. It occurs when any of the tissues that divide the septum do not grow completely. This leaves one or more holes. It may also leave one leaky valve instead of two separate valves.
Last reviewedJuly 2013by Michael J. Fucci, DO; Michael Woods, MD
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