A 'large' PFO is defined for a height ≥ 2 mm, as measured by the maximum separation between the septum primum and septum secundum in the end-systolic frame. A 'long' PFO tunnel is defined for a length ≥ 10 mm, as measured by the maximum overlap between the septum primum and septum secundum.
Are You a Candidate for PFO Closure? You may be a candidate for minimally invasive PFO closure if you: Have been diagnosed with a PFO and have had a stroke due to an unknown cause (one not attributed to a condition such as atrial fibrillation or carotid artery disease)
These findings support the concept that in the presence of a patent foramen ovale any left-sided cardiac lesion increasing left atrial size and pressure may induce left-to-right interatrial shunt through this channel and that the prevalence rate is much higher than generally acknowledged.
A healthcare provider may recommend a PFO closure procedure if: You've had a transient ischemic attack (TIA) more than once. You've had cryptogenic (from an unknown cause) strokes more than once. You have a low level of oxygen in your blood.
Ing to this model, PFOs smaller than 8 mm should be closed with a 25 mm device, PFOs 8 mm to 11 mm with a 35 mm device, and PFOs larger than 11 mm with an Amplatzer septal occluder.
Now the oxygen-rich blood comes from the lungs and enters the left upper heart chamber. The pressure of the blood pumping through the heart usually forces the flap opening of the foramen ovale to close. In most people, the opening closes sometime during infancy.
Of 70 patients, 62 experienced spontaneous closure (89%). Figure 2. Kaplan- Meir plot of time to spontaneous closure of PFO. Spontaneous PFO closure occurred at a median age of 8 months.