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
Grade
no characteristics of thrombus present
0
possible thrombus present (suggestive findings)
1
definite thrombus present, small
2
definite thrombus present, moderate
3
definite thrombus present, large
4
Features suggesting thrombus on angiography:
(1) reduced contrast density
(2) haziness
(3) irregular lesion contour
(4) smooth convex meniscus at the site of total occlusion
Thrombus Greatest Dimension
Size
<= 50% of vessel diameter
small
51-199% of vessel diameter
moderate
>= 200% (2 times) the vessel diameter
large
where:
• The greatest dimension for a thrombus will typically be its length.
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