The degree of collateral circulation to a culprit coronary artery after thrombolysis can be graded using the criteria from the Thrombolysis in Myocardial Infarction (TIMI) IIIA trial.
Timing of evaluation: 90 minutes after thrombolysis
Angiographic Findings
Collateral Circulation
Grade
no filling of the recipient (culprit) artery
none
0
minimal to partial filling of the recipient (culprit) artery
minimal
1
nearly complete to complete filling of the recipient (culprit) artery
well-developed
2
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