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A ventricular septal defect (hole in the heart) is a congenital heart condition where there is an opening in the wall that separates the heart's lower chambers. Normally, this wall closes before birth, ensuring that oxygen-rich blood does not mix with oxygen-poor blood.

Ventricular septal defect (a hole within the heart) is a congenital heart condition where a gap forms in the wall that separates the heart's lower chambers. During normal development, the wall between these chambers typically closes before the fetus is born.