Backgrounds: The difference in clinical presentations (acute coronary syndrome [ACS] and stable coronary artery disease [SCAD]) and related angiographic morphologies of sirolimus-eluting stent (SES) failure requiring target lesion revascularization (TLR) during early-term (<1year), late-term (1-5years), and very late-term periods (>5years) remains unknown.
Methods: Among 4484 lesions undergoing SES implantation, clinically-driven TLR was performed on 105 lesions during early-term, 169 lesions during late-term, and 147 lesions during very late-term period. Angiographic morphological patterns were divided into focal or non-focal patterns and stent-edge or stent-body patterns.
Results: The proportion of ACS substantially increased in very late TLR lesions (57.1%) from early (40.0%, p=0.01) and late TLR lesions (36.7%, p<0.001). The proportions of both stent-edge and non-focal patterns were higher in very late TLR lesions than in early and late TLR lesions. Although the stent-edge pattern tended to be more prevalent in SCAD lesions than in ACS lesions during the early- and late-term periods, it was more frequently observed in ACS lesions than in SCAD lesions during the very late-term period (65.5% vs. 47.6%, p=0.04). The non-focal pattern was more frequent in ACS lesions than in SCAD lesions during all 3 periods. However, the proportion of the non-focal pattern in ACS lesions was extremely high during the very late-term (90.5%) compared with the early- (47.6%, p<0.001) and late-term periods (48.4%, p<0.001).
Conclusions: Stent-related ACS became more common beyond 5years after SES implantation. Stent-edge and non-focal patterns were the main angiographic morphologies of very late SES failure, particularly causing ACS.
Keywords: Acute coronary syndrome; Angiography; Long-term follow-up; Sirolimus-eluting stent; Stent edge.
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