Left-to-right shunt

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Atrial septal defect with left-to-right shunt
Atrial septal defect with left-to-right shunt

A left-to-right shunt is a cardiac shunt which allows, or is designed to cause, blood to flow from the left heart to the right heart. This occurs when:

  1. there is an opening or passage between the atria, ventricles, and/or great vessels; and,
  2. left heart pressure is higher than right heart pressure and/or the shunt has a one-way valvular opening.


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