Figure 3.

Angiographic classification of intrastent restenosis (adapted from an open-access source [65]). (a) Type I: there are four types of focal ISR described in the image above. (b) Type II: the observed lesions are confined strictly to the confines of the stent and do not exhibit any extension beyond its proximal or distal extremities. Type III: Diffuse, proliferative ISR. The identified lesions manifest a length exceeding 10 mm, exhibiting an extension that surpasses the boundaries of the stent at both its proximal and distal margins. Type IV: total occlusion of the stent resulting in no coronary perfusion.