Pulmonary-to-systemic shunt

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A pulmonary-to-systemic shunt is a cardiac shunt which allows, or is designed to cause, blood to flow from the pulmonary circulation to the systemic circulation. This occurs when:

  1. there is a passage between two or more of the great vessels; and,
  2. pulmonic pressure is higher than systemic pressure and/or the shunt has a one-way valvular opening.

A pulmonary-to-systemic shunt functions as follows:

  1. right-to-left in the absence of arterioventricular discordance.
  2. left-to-right if the great vessels are transposed.