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| | Ventricular Septal Defect - My Child Has - Children's Hospital Boston |
 | | Perimembranous VSD — An opening in the upper section of the ventricular septum, near the valves, occurs in 75 percent of all VSD cases. |
 | | Ventricular septal defects are the most commonly occurring type of congenital heart defect, occurring in one to three out of every 1,000 live births, and four to seven out of every 1,000 premature births. |
 | | When blood passes through the VSD from the left ventricle to the right ventricle, a larger volume of blood than normal must be handled by the right side of the heart, causing the right side to become overworked and enlarged. |
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