- Thrombus score according to TIMI study group (0= no cineangiographic characteristics of thrombus are present; 1 = possible thrombus is present with such angiography characteristics as reduced contrast density, haziness, irregular lesion contour, or a smooth convex meniscus at the site of total occlusion suggestive but not diagnostic of thrombus. 2 = definite thrombus, with greatest dimension <1/2 the vessel diameter; 3 = definite thrombus , with greatest linear dimension >1/2 but <2 vessel diameters; 4 = definite thrombus, with the largest dimension >2 vessel diameters ; 5= there is a total occlusion);