Tutorial | Part 1: Definitions

Total occlusion

No intra-luminal antegrade flow (TIMI 0) beyond the point of occlusion. However, antegrade flow beyond the total occlusion might be maintained by bridging collaterals and/or ipsi collaterals.
At the question ‘Specify which segments are diseased for lesion X' one should only fill out the segment number of the start of the Total Occlusion. 

  • Blunt stump:

  •  Bridging collaterals:

Small channels running in parallel to the vessel and connecting proximal vessel to distal and being responsible for the ipsilateral collateralization.

Note: In case of a Total Occlusion, we will not score any lesion distally (if applicable) since we are not sure about the actual situation prior to total occlusion opening.