Paradoxical embolism
Passage of a clot (thrombus) from a vein to an artery. When clots in veins break off (embolize) , they travel first to the right side of the heart and, normally, then to the lungs where they lodge. The lungs act as a filter to prevent the clots from entering the arterial circulation. However, when there is a hole in the wall between the two upper chambers of the heart (an atrial septal defect), a clot can cross from the right to the left side of the heart, then pass into the arteries as a paradoxical embolism. Once in the arterial circulation, a clot can travel to the brain, block a vessel there, and cause a stroke (cerebrovascular accident). Because of the risk of stroke from paradoxical embolism, it is usually recommended that even small atrial septal defects be repaired. Also called crossed embolism.

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blockage of a systemic artery by a thrombus originating in a systemic vein, which has passed through a defect that permits direct communication between the right and the left side of the heart, usually an open foramen ovale. Called also crossed e.

Medical dictionary. 2011.

Look at other dictionaries:

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  • paradoxical — par·a·dox·i·cal .par ə däk si kəl also par·a·dox·ic sik adj not being the normal or usual kind <a paradoxical embolism> * * * para·dox·i·cal (par″ə dokґsĭ kəl) occurring at variance with the normal rule …   Medical dictionary

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  • Crossed embolism — Passage of a clot (thrombus) from a vein to an artery. When clots in veins break off (embolize) , they travel first to the right side of the heart and, normally, then to the lungs where they lodge. The lungs act as a filter to prevent the clots… …   Medical dictionary

  • Atrial septal defect — PFO redirects here. For the airport, see Paphos International Airport. Atrial septal defect Classification and external resources Heart of human embryo of about thirty five days ICD 10 …   Wikipedia

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