Long stents in femoropopliteal interventions: Risk or solution?

Aim: This study aimed to determine the precise influence of total implanted stent length and active smoking on early primary patency among a highly selective cohort of patients undergoing endovascular reconstruction for complex (TASC C/D) femoropopliteal lesions utilizing self-expanding nitinol stents. 

Material and Methods: This single-center, retrospective observational cohort analysis included one hundred twenty patients presenting with severe claudication or chronic limb-threatening ischemia (CLTI) who required continuous stenting exceeding five centimeters between the years 2020 and 2025. Primary patency outcomes were statistically evaluated utilizing Kaplan-Meier survival estimates and multivariate Cox proportional hazards regression to adjust for anatomical and clinical confounders. 

Results: The average implanted stent length was 12.56 centimeters, yielding a mean early patency of 8.79 months. Multivariate analysis demonstrated no significant linear correlation between continuous stent length and vessel occlusion; however, categorical stratification revealed a statistically significant biphasic paradox (p = 0.042). Specifically, mean patency decreased from 9.10 months for stents under 10 centimeters to 7.20 months for stents between 10 and 14.9 centimeters, yet paradoxically rebounded to 10.05 months for extensive scaffolding measuring 15 centimeters or greater. Furthermore, the robust mechanical scaffold overrode early biological risks, as systemic smoking did not significantly compromise early mechanical patency. 

Conclusion: Contemporary endovascular outcomes in complex PAD fundamentally challenge the traditional assumption that stent length linearly predicts mechanical failure. The paradoxical superiority of stents ≥ 15 cm reflects the strategic optimization of anatomically healthy landing zones. Extensive mechanical scaffolding that continuously bridges diseased segments from healthy-to-healthy tissue mitigates compliance mismatch and edge-effect restenosis, thereby optimizing early luminal patency.