Thrombus may be identified in a coronary artery on angiography. The lesion can be graded using the criteria from the Thrombolysis in Myocardial Infarction (TIMI) IIIA trial.
Appearance on Angiography
no characteristics of thrombus present
possible thrombus present (suggestive findings)
definite thrombus present, small
definite thrombus present, moderate
definite thrombus present, large
Features suggesting thrombus on angiography:
(1) reduced contrast density
(3) irregular lesion contour
(4) smooth convex meniscus at the site of total occlusion
Thrombus Greatest Dimension
<= 50% of vessel diameter
51-199% of vessel diameter
>= 200% (2 times) the vessel diameter
• The greatest dimension for a thrombus will typically be its length.
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