Over load: Right atrium and ventricle are dealing with 1.5 to 2 times of the blood volume with the shunt that is why it gets dilated and hypertrophied.
Answered 1/4/2014
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Enlargement: ASD causes enlargement of the right side of the heart. Not hypertrophy unless it (rarely) has led to pulmonary hypertension. Pfo is not a disease. Almost 20% of healthy people have it.
Answered 2/2/2017
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