ACC/AHA classification of coronary lesions

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ACC/AHA classification of coronary lesions is a system use to classify coronary arterial calcific plaque burden. It is classified as

  • type A
    • discrete (<10 mm)
    • concentric 
    • nonangulated segment <45º
    • smooth contour
    • little or no calcification
    • less than totally occlusive
    • not ostial in location
    • no major branch involvement
    • absence of thrombus
  • type B
    • tubular (10-20 mm)
    • eccentric
    • moderate tortuosity of proximal segment
    • moderately angulated, 45-90º
    • irregular contour
    • moderate to heavy calcification
    • ostial in location
    • bifurcation lesions requiring double guidewires
    • some thrombus present
    • this can be sub classified into two sub categories
      • type B1: having one of the above characteristics
      • type B2: having two or more of the above characteristics
  • type C
    • diffuse
    • excessive tortuosity of proximal segment
    • extremely angulated, >90º
    • inability to protect major side branch
    • degenerated vein graft with friable lesions

See also