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Atrial septal defect (ASD)

A communication between the left and right atrium is entirely normal during the embryo period. Following birth, the opening normally closes because of the pressures in the two atria are reversed. If the connection remains open, this is called an atrial septal defect.

The most severe form of atrial septum defect is the so-called common atrium, in which practically the entire atrial septum is absent.

Surgery is indicated if there are clinical symptoms and when there is a left-to-right shunt of over 30%.

Nowadays, the operation is only performed using extracorporeal circulation. Depending on the size, the defect is closed directly or with a patch. Correction of ostium primum­ and sinus venosus defects requires use of a patch in most cases.

Atrial septal defect

 

 

Operation