Angioscopy study from a large patient population comparing sirolimus-eluting stent with biodegradable versus durable...

Area of Science:

• Cardiovascular Research
• Biomaterials Science
• Interventional Cardiology

Background:

• Neointimal coverage (NIC) is a key factor in stent performance after coronary interventions.
• Durable polymers in sirolimus-eluting stents (SES) have been associated with varying degrees of inflammation and coverage.
• Biodegradable polymers (BDPM) offer a potential alternative to improve stent healing and reduce adverse events.

Purpose of the Study:

• To compare neointimal coverage (NIC), subclinical thrombus, and plaque characteristics at 9 months post-implantation.
• To evaluate the performance of SES with durable polymer versus BDPM.

Main Methods:

• A prospective study involving 175 patients comparing Cypher (durable polymer) and Excel (BDPM) stents.
• Neointimal coverage (NIC) graded 0-3; plaque color assessed (white to dark yellow).
• Thrombus and "inflaming" (incomplete NIC with blush) were diagnosed based on specific criteria.

Main Results:

• The BDPM group (Excel) showed significantly higher minimal and maximal NIC grades compared to the durable polymer group (Cypher).
• The BDPM group had less yellow plaque, thrombus, and "inflaming" compared to the durable polymer group.
• Overlapping stent segments were associated with lower NIC grades and increased "inflaming" in both groups, with a significant difference between Cypher and Excel.

Conclusions:

• Sirolimus-eluting stents (SES) with biodegradable polymer (BDPM) demonstrate improved neointimal coverage (NIC).
• BDPM stents are associated with reduced instances of yellow plaque, thrombus, and "inflaming."
• Overlapping stent segments require further attention due to lower NIC and higher "inflaming."