Coronary angiography ACC-AHA characteristics of type A, B, and C coronary lesions
Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]
Overview
ACC-AHA Characteristics of Type A, B, and C Coronary Lesions
Type A Lesions (High Success [> 85%]; Low Risk)
- Discrete (< 10 mm)
- Little or no calcium
- Concentric
- Less than totally occlusive
- Readily accessible
- Not ostial in location
- Nonangulated segment (< 45 degrees)
- No major side branch involvement
- Smooth contour
- Absence of thrombus
Type B Lesions (Moderate Success [60%–85%]; Moderate Risk)
- Tubular (10–20 mm length)
- Moderate to heavy calcification
- Eccentric
- Total occlusions < 3 months old
- Moderate tortuosity of proximal segment
- Ostial in location
- Moderately angulated (45-90 degrees)
- Bifurcation lesion requiring double guidewire
- Irregular contour
- Some thrombus present
Type C Lesions (Low Success [< 60%]; High Risk)
- Diffuse (> 20 mm length)
- Total occlusion > 3 months old
- Excessive tortuosity of proximal segment
- Inability to protect major side branches
- Extremely angulated segment (> 90 degrees)
- Degenerated vein grafts with friable lesions