In ACC/AHA lesion classification, which type is most complex?

In ACC/AHA lesion classification, which type is most complex?

• A. Type A
• B. Type B
• C. Type C
• D. Type D

Answer: (C)

The key idea is that lesion complexity rises with length, calcification, and tortuosity, making the PCI procedure more difficult. In the ACC/AHA scheme, simple lesions are Type A, intermediate ones are Type B, and the most challenging are Type C. Type C lesions are diffuse and long, often heavily calcified and highly tortuous, and may include chronic total occlusions. This combination makes crossing the lesion, delivering equipment, and achieving good stent expansion much harder, with higher risk of complications and lower success rates. Because of these factors, Type C represents the most complex category, often requiring advanced techniques or alternative strategies.

The key idea is that lesion complexity rises with length, calcification, and tortuosity, making the PCI procedure more difficult. In the ACC/AHA scheme, simple lesions are Type A, intermediate ones are Type B, and the most challenging are Type C. Type C lesions are diffuse and long, often heavily calcified and highly tortuous, and may include chronic total occlusions. This combination makes crossing the lesion, delivering equipment, and achieving good stent expansion much harder, with higher risk of complications and lower success rates. Because of these factors, Type C represents the most complex category, often requiring advanced techniques or alternative strategies.