Intracoronary brachytherapy--clinical state and pathophysiological considerations

Area of Science:

• Cardiovascular medicine
• Interventional cardiology
• Radiation oncology

Background:

• In-stent restenosis limits coronary stent efficacy despite various preventive measures.
• Intravascular irradiation is the only proven method to significantly reduce restenosis and cardiovascular events.

Purpose of the Study:

• To review the mechanisms, complications, and therapeutic options of vascular irradiation for in-stent restenosis.
• To update angiographic and clinical results from randomized and observational studies.

Main Methods:

• Review of existing literature on vascular irradiation for in-stent restenosis.
• Analysis of mechanisms, complications (edge effect, geographic miss, late thrombosis), and management strategies.
• Compilation of clinical and angiographic data from randomized and observational studies.

Main Results:

• Vascular irradiation reduces neointima formation, restenosis, and major adverse cardiovascular events by approximately 50%.
• Effective in high-risk subsets (long lesions, venous grafts, diabetics).
• Complications like edge effect and geographic miss can be mitigated by appropriate radiation source length and technique. Late thrombosis is reduced with extended antiplatelet therapy.

Conclusions:

• Vascular brachytherapy offers significant clinical benefit in preventing restenosis and treating in-stent restenotic lesions.
• Optimized application of vascular irradiation, addressing its limitations, solidifies its role as a proven treatment option.