The commonest heart defect ("Hole in the heart"). When small, such defects cause little in the way of problems and often "heal"  (close) on their own. Blood flows from left ventricle to right ventricle at high pressure, often producing a loud "murmur" with each heart beat. The effect on heart function depends on the size of the defect, but may be very minor. Surgery may not be required, if the heart shows no evidence of "strain".

Small VSD

Large VSD

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