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Ventricular septal defect (VMP), a hole in the heart, is a common heart defect that is present at birth (congenital). An opening (defect) occurs in the wall (septum) that separates the lower chambers of the heart (ventricles) and allows blood to pass from the left to the right side of the heart. Then the oxygen-rich blood is pumped back to the lungs rather than the body, forcing the heart to work harder. A small ventricular septal defect may not cause problems, and many small ventricular septal defects close on their own. Medium or large interventricular septa may need surgical treatment at an early age to prevent complications.

The heart has two upper and two lower chambers. In the upper chambers, the right and left Atria receives blood. The lower chambers, the right and left ventricles, pump blood out of your heart. Heart valves serve as gates that allow blood to flow in the right direction.