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A small ventricular septal defect usually does not cause any problems. Medium or large defects can cause a range of disorders — from mild to life-threatening. Treatment can prevent many complications:

  • Heart failure. In a heart with medium or large dmj, the heart needs to work harder to pump enough blood into the body. Because of this, heart failure can develop if moderate-to-large-size dmjp is not treated.
  • Pulmonary hypertension. Increased blood flow to the lungs due to DVT causes high blood pressure in the pulmonary arteries (pulmonary hypertension), which can lead to irreversible damage to them. This complication can cause reverse blood flow from the right ventricle to the left through a defect (Eisenmenger’s syndrome).
  • Endocarditis. This heart infection is an infrequent complication.
  • Other problems with the heart. These include abnormal heart rhythm and problems with the function of the valves.