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A ventricular septal defect (VSD) is a hole in the ventricular septum, the lower wall of the heart separating the right and left ventricles. A VSD is a congenital heart defect, in other words, a birth defect of the heart. Congenital heart defects are the most common form of birth defects, occurring in approximately 1 in 150 individuals. A VSD is the most common congenital heart defect; the overall incidence is 3-4 per 1000. There are many different types of VSD’s. The most common type, termed a muscular VSD, is formed when the muscle of the wall fails to completely seal. The majority of muscular VSD’s are very small and rarely of any physiologic consequence. Less common types of VSD’s include membranous, inlet and outlet types. These types of VSD's are often larger and may cause more problems for an infant or child.

A ventricular septal defect (VSD) is a hole in the ventricular septum, the lower wall of the heart separating the right and left ventricles. A VSD is a congenital heart defect, in other words, a birth defect of the heart. Congenital heart defects are the most common form of birth defects, occurring in approximately 1 in 150 individuals. A VSD is the most common congenital heart defect; the overall incidence is 3-4 per 1000. There are many different types of VSD’s. The most common type, termed a muscular VSD, is formed when the muscle of the wall fails to completely seal. The majority of muscular VSD’s are very small and rarely of any physiologic consequence. Less common types of VSD’s include membranous, inlet and outlet types. These types are often larger and may impose a hemodynamic burden.

A ventricular septal defect (VSD) is a hole in the ventricular septum, the lower wall of the heart separating the right and left ventricles. Surgery is occasionally necessary to close a VSD. This most commonly occurs in the setting of a large or moderate size defect. Indications for surgery in infancy include symptoms unresponsive to medication, elevated blood pressure in the lungs, and significant dilation of the heart due to excess blood flow. Usually the need for surgery in infancy becomes clear by 6-12 months of age, and often much earlier. Less common indications for surgery are infection of heart tissue due to the VSD, or damage to the aortic valve secondary to the VSD.