Angiographic Aspect of a 25-mm Amplatzer PFO Occluder Before and After Release
Provided a correct view is chosen depicting the 2 disks in perfect profile without any overlap (usually a left oblique projection with cranial tilt), the correct position of the device can be unequivocally ascertained before (left) and documented after (right) release. The left halves of the disks are separated by the muscular septum secundum (SS), whereas the septum primum (SP) is thin, wraps around the inferior rim of the device before release (device position tilted by the stiff pusher cable), and extends from the lower rim after release. The dashed arrow indicates the actual PFO tunnel. The fact that the interdisk connector is not passing the PFO at its very top (top of arrow) is explained by the fact that the PFO slit has to be pictured as a sad mouth with a device connector typically hanging low in either mouth angle. PFO = patent foramen ovale.