The degree of ulceration (infarct-related lesion) in the culprit coronary artery after thrombolysis can be graded using the criteria from the Thrombolysis in Myocardial Infarction (TIMI) IIIA trial.
no angiographic evidence of ulceration in culprit artery
lesion contains a neck with contrast material dissecting under the plaque either proximally or distally
distinct extravascular extravasation of the contrast material
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