Quantitative and qualitative changes in DES-related neointimal tissue based on serial OCT

Area of Science:

• Cardiovascular research
• Medical imaging technology
• Interventional cardiology

Background:

• Limited understanding of long-term vascular response to drug-eluting stents (DES).
• Need for detailed serial assessment of neointima characteristics using optical coherence tomography (OCT).

Purpose of the Study:

• To evaluate serial quantitative and qualitative changes in vascular response to DES using OCT.
• To assess neointimal coverage, thickness, and morphology changes from 9 months to 2 years post-implantation.

Main Methods:

• Serial OCT imaging in 72 patients with 76 DES-treated lesions.
• Quantitative analysis of neointimal thickness, stent strut coverage, and apposition.
• Qualitative assessment of neointimal morphology at 9 months and 2 years.

Main Results:

• Significant increase in neointimal thickness (164 μm to 214 μm) and decrease in uncovered struts (4.4% to 2.3%).
• Increased prevalence of lipid-laden neointima (27.6% vs. 14.5%) and thin-cap neoatheroma (13.2% vs. 3.9%) at 2 years.
• No significant changes in malapposed struts or intracoronary thrombi incidence.

Conclusions:

• Neointimal coverage improves significantly from 9 months to 2 years post-DES implantation.
• In-stent neoatherosclerosis, including lipid-laden neointima, may progress during extended follow-up.
• OCT provides valuable insights into long-term vascular healing and potential adverse remodeling after DES placement.