[Coronary vascular stent implantation--experiences with the first 100 implants]

Area of Science:

• Cardiology
• Interventional Cardiology
• Biomedical Engineering

Background:

• Elastic recoil is a significant challenge after percutaneous transluminal coronary angioplasty (PTCA).
• Coronary stent implantation aims to prevent elastic recoil, reduce acute complications, and minimize restenosis.
• The study evaluates the efficacy and safety of coronary stent implantation in a clinical setting.

Purpose of the Study:

• To assess the effectiveness of coronary stent implantation in blocking elastin recoil.
• To determine the rates of acute complications, including dissection, occlusion, and myocardial infarction.
• To evaluate the incidence of restenosis and subacute thrombosis following stent implantation.

Main Methods:

• Coronary stent implantation was performed in 91 patients.
• Measurements of coronary luminal diameter were taken before and after PTCA, and after stent implantation.
• Follow-up coronary angiograms were conducted at 4 to 6 months to assess restenosis.
• Complications such as stent embolization, acute occlusion, thrombosis, myocardial infarction, and bleeding were recorded.

Main Results:

• Successful stent implantation was achieved in 95% of patients, with no stent embolization.
• Mean coronary artery diameter increased significantly post-stenting, indicating effective blocking of elastic recoil.
• The overall restenosis rate was 21%, with higher rates for multiple stent implantations (60%) compared to single stents (14%).
• Subacute thrombosis occurred in 12% of patients, particularly after bail-out stenting, but this rate decreased to 3% with improved anticoagulation monitoring.

Conclusions:

• Coronary stent implantation is a safe and effective method for blocking elastic recoil and improving coronary luminal diameter.
• While restenosis remains a concern, particularly with multiple stents, bail-out stenting can be performed safely with careful anticoagulation management.
• Optimized anticoagulation monitoring is crucial for reducing subacute thrombosis rates after coronary stent implantation, especially in complex cases.