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Kids' Health
http://kidshealth.org/parent/medical/heart/vsd.html#cat141
A ventricular septal defect (VSD) — sometimes referred to as a hole in the heart — is a type of congenital heart defect in which there is an abnormal opening in the dividing wall between the main pumping chambers of the heart (the ventricles).
VSDs are the most common congenital heart defect, and in most cases they're diagnosed and treated successfully with few or no complications...