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Bare metal stents size: correlations with coronary stent restenosis

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Introduction: The coronary stents use for the ischemic heart diseases interventional treatment, has decreased the incidence of postprocedural complications compared to the classic balloon angioplasty. Knowledge of technical factors associated with subsequent risk of angiographic recurrences can guide the strategy for selection of the patients and the type of stent to be implanted.

Methodology: The aim of this study is to identify the technical characteristics of “bare metal” stents made of cobalt chrome alloy or stainless steel which are associated with a higher risk of restenosis during the first year after implantation.A total number of 808 coronary stent segments were angiographically analyzed, 472 (58.42%) of them presenting imaging criteria of restenosis. It was evaluated the relationship between the size of implanted stents (combination diameter length) and the presence of restenosis at control angiography.

Results: The obtained data show that the use of stents with a diameter Ė2.5 mm and length 15-28 mm or stents with small diameter (Ė2.5 mm), average diameter (2.5 to 3.25 mm) and long length (>28 mm) is significantly associated with restenosis after stenting (p <0.001).

Conclusions: Decreasing the diameter of the implanted stent or increasing the length of metallic material at the level of vascular wall is associated with a higher risk of clinical and imagistic recurrence. Clinical follow-up of these patients is required to be more frequent. Abbreviations: BMS: bare metal stent, DES: drug eluting stent, OD: odd ratio, PCI: percutaneous coronary intervention

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Daniel Nita, Ionel Droc, Liviu Chiriac and Cosmin Alexandru Buzila

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