Comprehensive Analysis of Post-Pipeline Endothelialization and Remodeling

Area of Science:

• Endovascular surgery
• Cerebrovascular disease
• Medical device technology

Background:

• Endothelial overgrowth is considered crucial for successful post-flow-diverter endoluminal reconstruction.
• Vascular remodeling, the vessel's dynamic response to flow-diverter implantation, is less emphasized but significant.
• Angiographic methods can provide useful observations of these postimplantation changes.

Purpose of the Study:

• To quantitatively evaluate observable postimplantation changes in target vessels after Pipeline Embolization Device deployment.
• To assess the role of vascular remodeling distinct from endothelialization.

Main Methods:

• Study included 100 adults with aneurysms treated with the Pipeline Embolization Device with Shield Technology.
• Follow-up conventional angiography (2D DSA) was used to analyze target vessel size, device diameter, and endothelial thickness.
• Demographic, antiplatelet, and device-related parameters were recorded and analyzed.

Main Results:

• Neointimal overgrowth thickness (mean 0.3 mm) was inversely correlated with age and independent of other analyzed parameters.
• Outward arterial remodeling counteracted the lumen diameter reduction from neointimal overgrowth.
• A direct relationship was found between outward remodeling and the relative diameter of the implanted device, with remodeled diameters reduced by 15%.

Conclusions:

• Vessel healing after flow-diverter implantation involves both outward remodeling and neointimal overgrowth.
• Judicial oversizing of the device may be considered to counteract lumen reduction, balancing against decreased metal coverage.
• Further analysis for other devices is essential.