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<p>the pressure in the pulmonary circulatory system (due to <a href="page.php?w=pulmonary_hypertension">pulmonary hypertension</a>, temporarily while <a href="page.php?w=cough">cough</a>ing, etc.) can cause the foramen ovale to remain open.</p>

<p><big>Types</big></p>
<p><a href="page.php?w=Image%3ASchematic_drawing_of_various_types_of_atrial_septal_defect.png">right</a>The six types of atrial septal defects are differentiated from each other by whether they involve other structures of the heart and how they are formed during the developmental process during</p><p>
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