Atrial Septal Defect (A.S.D) Occlusion by ASO

What is an atrial septal defect?

The heart is divided into four chambers and the upper chambers are divided by a wall called septum. Atrial septal defect is a congenital defect seen in the heart, when a hole is present in the septum.

What is an ASO?

The ASO or AMPLATZER® Septal Occluder is a device used to close an abnormal opening in the wall between the two upper chambers of the heart (the atria), without using open-heart surgery. The device consists of two parts: (1) a delivery system and (2) a permanent implant. The delivery system helps transport the implant to the site of the defect in the heart. The implant is the part of the device that remains in the heart to block the hole. The implant is a self-expandable double disk made from wire mesh and polyester fabric.

How is atrial defect corrected by occlusion?

  • A small, thin, flexible tube (catheter) is inserted into a blood vessel in the groin and guided into the heart.
  • Once the catheter is in the heart, the surgeon passes a special device, called a septal occluder, into the ASD.
  • The catheter tip is moved into place, and the device is pushed out of the catheter, across the atrial septal defect. The umbrella patch is then opened to cover the hole and secured in place.


Panel Of Specialist

Dr. Zainal Hamid

Dr. N. Arunachalam
MBBS, FRCS (Edin), AM (Mal)