Table 1.

Thrombolysis-in- myocardial infarction (TIMI) grading of thrombus burden

TIMI grade 0: no angiographic evidence of thrombus

TIMI grade 1 (possible thrombus present): reduced contrast density, irregular lesion contour, or a smooth convex meniscus at the site of the total occlusion, suggestive but not diagnostic of thrombus

TIMI grade 2 (small thrombus): definite thrombus, with greatest dimension <1/2 the vessel diameter

TIMI grade 3 (moderate thrombus): definite thrombus but with greatest linear dimension >1/2 but <2 the vessel diameter

TIMI grade 4 (large thrombus): definite thrombus, with the largest linear dimension >2 the vessel diameter

TIMI thrombus grade 5: total occlusion

Adapted with permission from Sianos G, Papafaklis MI, Serruys PW. Angiographic thrombus burden classification in patients with ST-segment elevation myocardial infarction treated with percutaneous coronary intervention. J Invasive Cardiol 2010;22(Suppl B):6B-14B.