Retrograde

In anterograde embolism, the movement of emboli is in the direction of blood flow. In retrograde embolism, the emboli move in opposition to the blood flow direction; this is usually significant only in blood vessels with low pressure (veins) or with emboli of high weight.

Etymology

"Embolism" is first recorded in English in the 14th century and originally meant "intercalcation" or "insertion of days into a calendar"; it came from the Old French embolisme, with the same meaning, and is ultimately derived from

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