Benson

What did we learn?
These observations support previous reports that the most
common reason deferring a transcatheter procedure was
insufficient or deficient rims, particularly the IVC or posterior
rims, as seen in just over 1/3 of the children
In 1/4 of the children the operator felt that the device would be
too large to be accommodated in the septum & interfere with
contiguous cardiac structures & a risk factor for erosion,
atrioventricular valve regurgitation, complete heart block, or
bradycardia
From this data, weight can be used to guide the largest device,
which could plausibly be implanted based on a D/W: in cases 1.5:1 was thought too large to be implanted