TIMI Thrombus Grade

Transcript of the video: TIMI Thrombus Grade is useful for quantification of thrombus which is detected angiographically, mainly for study purposes, but also for day to day use. There are six grades, starting from grade 0 to grade 5. Grade 0 is no thrombus, while grade 5 is total occlusion of the vessel due to thrombus formation.

These are the grade, TIMI grades, named after the landmark Thrombolysis In Myocardial Infarction trial. Grade 0, no angiographic evidence of thrombus. Grade 1, possible thrombus present, grade 2, small thrombus, grade 3, moderate thrombus, grade 4, large sized thrombus and grade 5, total occlusion.

Going down a little more into details of TIMI thrombus grade. Grade 0, no angiographic evidence of thrombus. Grade 1, possible thrombus present. Reduced contrast density, haziness, irregular lesion contour, or a smooth convex meniscus at the site of total occlusion suggestive, but not diagnostic of thrombus. Grade 2, small thrombus. Definite thrombus, with greatest dimension half the vessel diameter or less than that. And grade 3, moderate thrombus. Definite thrombus, but with greatest diameter, that is linear dimension, more than half, but less than two vessel diameters. Grade 4, large sized thrombus. It is a definite thrombus with the largest linear dimension more than two vessel diameters. Grade 5 is total occlusion, which is typical thrombus type of total occlusion. And grades 2 to 5 are taken as thrombus for study purposes. Grade 0 to 1 are not taken for study purpose as thrombus.