10/24/2025
A hole in the heart — like a PFO or ASD — can let a clot travel from the right side of the heart to the left, bypassing the lungs. The clot can then reach the brain and block blood flow, causing a stroke (a paradoxical embolism).
Doctors find it with an echocardiogram, sometimes using a bubble test to see if blood crosses between the heart’s chambers.
Prevention can include blood thinners, closing the hole with a catheter procedure, and managing clot risks like staying active and avoiding dehydration