Arterial Remodeling After Bioresorbable Scaffolds and Metallic Stents

Area of Science:

• Cardiovascular Research
• Medical Devices
• Interventional Cardiology

Background:

• Previous studies suggested late luminal enlargement and expansive remodeling with bioresorbable vascular scaffolds (BVS).
• No randomized trials have directly compared BVS with metallic stents regarding remodeling patterns.

Purpose of the Study:

• To compare vessel remodeling patterns between Absorb BVS and Xience metallic drug-eluting stents (DES).
• To identify independent predictors of vessel remodeling after stent implantation.

Main Methods:

• The ABSORB II randomized trial investigated 383 lesions using intravascular ultrasound.
• Vessel and lumen area changes were assessed post-procedure and at 3-year follow-up.
• Nine patterns of vessel remodeling were categorized based on area changes.

Main Results:

• BVS demonstrated significantly greater relative changes in mean vessel area compared to DES (6.7% vs. 2.9%).
• Mean lumen area changes also differed significantly between BVS and DES arms (1.4% vs. -1.9%).
• Predictors of expansive remodeling included BVS use, female sex, high balloon-artery ratio, and baseline LDL cholesterol.

Conclusions:

• Expansive vessel wall remodeling was more frequent and intense with BVS compared to metallic DES.
• Patient baseline characteristics and periprocedural factors independently predicted remodeling.
• Further research is needed to determine the clinical impact of observed remodeling patterns for optimizing patient outcomes.