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A member asked:

How does the pulmonary pressure get high enough in asd to make it a right to left shunt instead of the opposite if its just a small hole?

A doctor has provided 1 answer
Dr. Rick Koch answered

Pulmonary: Hypertension can result from years of increased pulmonary return when the pressure in the right atrium gets higher than left atrium flow direction shifts.

Answered 6/24/2013

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