PFOs are commonly closed with an occluding device. The procedure is performed in a cardiac catheterization
laboratory. The occluder is threaded through the veins into the left atrium, expanded and pulled through the
PFO, sandwiching the membrane and closing the hole.
Within a week, the body starts covering the device with a layer of endothelial cells. Within six months, the PFO is fully covered with these cells, and the device has become part of the heart.
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