Tutorial | Part 1: Definitions

Which lesions should be scored?

Each coronary lesion with a Diameter Stenosis ≥50% in vessels ≥1.5 mm must be scored. Each lesion can involve ≥1 diseased segments.
If serial stenoses are less than 3 vessel reference diameters apart, they should be scored as one lesion. However, stenoses at a greater distance from each other (more than 3 vessel reference diameters), are considered as separate lesions.

* ≥3 vessel reference diameters.

This case should be described as two lesions:
  • one lesion involving segments 5, 6, and 11 and
  • one lesion involving segment 6.

* <3 vessel reference diameters.
 
This case should be described as one lesion:
  • one lesion involving segments 5, 6, and 11.