About Atrial Septal Defect (ASD) Closures (Without Surgery)


​​​​​​​​​​Toronto General Hospital | map iconMaps & Directions
Eaton Building - 2nd Floor,​​ in the Cardiovascular Investigations Unit (CVIU)

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What We Do

An atrial septal defect is a hole in the wall that divides between the two upper chambers of the heart. These defects are present from birth. They usually vary in size from a penny to a loonie, and may damage the heart and lungs if left uncorrected.

An ASD Septal Occluders (Amplatzer Septal Occluder) is a double-sided disc that's used as a seal. It is separated by a waist which is sized to your defect. This device is made of surgical grade Dacron and metal alloys. These occluders can be inserted through a tube in the leg and implanted in the heart to close the defect.


Hours & Contact

Tuesdays and Wednesdays
12:00 am – 4:30 pm
8:00 am – 4:30 pm

Nurse Coordinator: Sue Jimeno RN
Phone: 416 340 4800 ext. 6258

 Health Information

​The Patient & Family Education Program at UHN offers valuable resources to help you understand your condition.​

Visit our health information section.​​​​​