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Ventricular septal defect (VSD) is a congenital (present at birth) heart condition where there is a hole in the heart’s septum (the divide between the left and right side). As a baby develops in the womb, it is typical for there to be openings in the heart that usually close right before or just after birth. With a ventricular septal defect (VSD) a hole remains in the septum between the lower heart chambers after birth.
Ventricular septal defect (VSD) causes increased blood flow within the heart and to lungs. If the hole isn’t repaired, it can cause permanent lung damage and other health complications.
Muscular VSD is the most common form of Ventricular septal defect (VSD). The hole is in the muscular portion of the lower heart wall.
With perimembranous VSD, the hole is in the lower heart wall (the membranous septum) near the valves.
With inlet VSD, the hole is in the heart wall near where the blood enters the left side through the tricuspid and mitral valves.
Conal septal VSD is the rarest form of Ventricular septal defect (VSD). The hole is in the lower heart wall below the pulmonary valve.
Most children with Ventricular septal defect (VSD) will not experience symptoms. If symptoms do occur, they will take place during infancy (from birth to 1 year*) and can vary. Less common symptoms include:
*Age limit of infants defined by the World Health Organization (WHO).
No one knows exactly why Ventricular septal defect (VSD) occurs, but it is thought to be genetic or the result of environmental factors. This is the most common type of congenital heart disease, accounting for approximately 25 percent.