In this section
A defect is present in the central part of the "Atrial Septum"
(the partition separating the Atriums). This allows red blood to
pass through into the right side of the heart, leading to
enlargement of the Right Ventricle and excessive flow in the lung
Defects of this type are common. They seldom lead to symptoms
during childhood and may not be detected until school age or later.
Symptoms are likely to develop by early to middle adult life.
Defects of this kind may be repaired surgically during childhood
(before they are likely to lead to damage to the heart or
lungs. Alternatively they can be closed, in suitable cases,
with a catheter procedure (Device Closure).
The Device is introduced through a Heart Catheter, which
has been passed up from a vein in the leg. The Device is made of
collapsible metal mesh, with thin membranes inside. Once inside the
ASD it will become covered by natural tissue within a few