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A ventricular septal defect, or VSD, is a hole in the wall (septum) between the lower pumping chambers (ventricles) of the heart. VSD is the most common congenital (present at birth) heart defect. VSDs are generally found in infancy. A murmur (or noise) is heard when blood crosses from the left pumping chamber to the right pumping chamber. This murmur may not be heard until days or weeks after birth. VSD can strain the lungs and pumping ch
