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What Is Atrial Septal Defect Closure?

Atrial septal defect closure is a procedure used to seal an abnormal opening between the right and left atria of the heart. Closure can be performed with a catheter-delivered device or with open-heart surgery depending on the type, size, and location of the defect. Secundum atrial septal defects are the type most commonly suitable for transcatheter device closure. Other defects, such as primum or sinus venosus defects, generally require surgical repair when closure is indicated.

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What Is Atrial Septal Defect Closure?

Atrial septal defect closure is a procedure used to seal an abnormal opening between the right and left atria of the heart. Closure can be performed with a catheter-delivered device or with open-heart surgery depending on the type, size, and location of the defect. Secundum atrial septal defects are the type most commonly suitable for transcatheter device closure. Other defects, such as primum or sinus venosus defects, generally require surgical repair when closure is indicated.

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Why Is Atrial Septal Defect Closure Performed?

Closure is considered when an atrial septal defect creates a significant left-to-right shunt and causes enlargement of the right side of the heart or other clinically meaningful effects. Repair can reduce the long-term risk of right-heart failure, pulmonary vascular disease, exercise intolerance, and selected rhythm problems. Small defects without significant shunting can sometimes be observed instead. Severe irreversible pulmonary vascular disease can make closure unsafe because the opening can be serving as a pressure-relief pathway.

How Is Atrial Septal Defect Closure Performed?

During transcatheter closure, a catheter is advanced through a vein to the heart and a closure device is positioned across the defect using imaging guidance. The device expands on both sides of the septum and remains in place while tissue gradually grows over it. Surgical closure is performed through the chest using cardiopulmonary bypass, and the defect is closed directly with sutures or with a patch. Echocardiography is used to assess the defect and confirm the quality of the repair.

What Is Recovery Like After Atrial Septal Defect Closure?

Recovery after catheter closure is usually shorter than after open-heart surgery, and many patients resume light activity relatively quickly. Antiplatelet medicine is commonly prescribed for a period after device placement to reduce clot formation while the device becomes covered by tissue. Surgical recovery includes healing of the chest incision and gradual return to normal activity over a longer period. Follow-up echocardiography and congenital cardiology care are used to monitor residual shunting, heart size, rhythm, and device or patch function.

What Are the Risks and Complications?

Possible catheter-closure complications include bleeding, vascular injury, abnormal heart rhythms, device embolization, residual shunting, blood clots, cardiac perforation, or erosion of nearby heart tissue. Surgical risks include bleeding, infection, rhythm disturbances, pericardial fluid, and complications related to cardiopulmonary bypass. Atrial arrhythmias can occur later even after a successful repair, particularly when closure is performed in adulthood. Careful imaging and patient selection are used to match the defect with the safest closure method.

Frequently Asked Questions About Atrial Septal Defect Closure

Can every atrial septal defect be closed with a catheter device?

No. Device closure is mainly used for suitable secundum defects with adequate surrounding tissue. Other ASD types or unfavorable anatomy generally require surgery.

Does ASD closure require open-heart surgery?

Not always. Many suitable secundum defects can be closed through a catheter without opening the chest. Surgical repair is still required for some defects.

Can an atrial septal defect close on its own?

Some small defects identified in infancy can close spontaneously or become clinically insignificant. Larger defects with significant shunting are less likely to do so.

Is lifelong follow-up needed after ASD closure?

Follow-up needs vary by age, repair type, residual findings, rhythm history, and other heart abnormalities. Many patients continue periodic congenital cardiology assessment.

References

Atrial Septal Defect (ASD). American Heart Association. https://www.heart.org/en/health-topics/congenital-heart-defects/about-congenital-heart-defects/atrial-septal-defect-asd. Date Accessed August 12, 2026.

Atrial Septal Defect (ASD). Centers for Disease Control and Prevention. https://www.cdc.gov/heart-defects/about/atrial-septal-defect.html. Date Accessed August 12, 2026.

Atrial septal defect (ASD) - Diagnosis and treatment. Mayo Clinic. https://www.mayoclinic.org/diseases-conditions/atrial-septal-defect/diagnosis-treatment/drc-20369720. Date Accessed August 12, 2026.

Catheter Management of Atrial Septal Defect. StatPearls (NCBI Bookshelf). https://www.ncbi.nlm.nih.gov/books/NBK536908/. Date Accessed August 12, 2026.

Atrial Septal Defect in Adulthood. American College of Cardiology. https://www.acc.org/latest-in-cardiology/ten-points-to-remember/2022/07/29/14/01/atrial-septal-defect-in-adulthood. Date Accessed August 12, 2026.