Paradoxical embolism is a phenomenon that happens only in "patent foramen ovale" or it can occur in every type, can you tell me about this?

Embolism: Embolism is a clot floats downstream. If there's a hole in one of the heart's walls, and if embolism occurs, it should float from an area of hi to lower pressure (L to R). If it goes the other way, (lo to hi), it's "paradoxical". Potential for PFO is likely present in 60-80% of nl people but only opens with sudden rise in pressure e.g cough or valsalva which suddenly raises right heart pressure.