| 1. | As the septum primum grows, the ostium primum progressively narrows.
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| 2. | Persistence of the ostium secundum is the most common atrial septal defect.
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| 3. | There is widening of the maxillary ostium that extends to the nasopharynx.
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| 4. | The ostium secundum progressively enlarges and the size of the septum primum diminishes.
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| 5. | This method avoids the symptoms that accompany most ostium secundum atrial septal defects.
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| 6. | The ostium secundum provides communication between the atria after the ostium primum closes completely.
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| 7. | The ostium secundum provides communication between the atria after the ostium primum closes completely.
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| 8. | The ostium secundum atrial septal defect accounts for 7 % of all congenital heart lesions.
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| 9. | The ostium secundum allows continued shunting of blood from the right atrium to the left.
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| 10. | About 10 to 20 % of individuals with ostium secundum ASDs also have mitral valve prolapse.
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