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Pharmacological stent deployment in the left anterior descending artery: late event indicators
Marcelo de Freitas Santos1, Sergio Gustavo Tarbine, Costantino Ortiz Costantini
1Hospital Cardiológico Costantini, São Paulo, SP, Brazil. mfsantos@cardiol.br
Insights
Pharmacological stents in the left anterior descending artery show low late cardiac events when optimized with intravascular ultrasound (IVUS). Multiple stents and small final stent areas (<3.88 mm²) increase event risk.
Area of Science:
- Cardiovascular Medicine
- Interventional Cardiology
- Medical Device Technology
Background:
- The effectiveness of pharmacological stents varies across different patient groups and lesion types.
- Optimizing stent implantation is crucial for reducing cardiac events.
Purpose of the Study:
- To assess the long-term clinical outcomes of patients receiving pharmacological stents in the left anterior descending artery.
- To identify predictors of cardiac events based on clinical, angiographic, and intravascular ultrasound (IVUS) data.
Main Methods:
- A study involving 205 patients who underwent 236 pharmacological stent implantations between May 2002 and August 2005.
- Intravascular ultrasound (IVUS) guidance was used for stent selection and optimization.
Main Results:
- After a mean follow-up of 711 days, stent thrombosis was 0.48%.
- The revascularization rate was 7.31%, and the overall event rate was 10.24%.
- Independent predictors of cardiac events included multiple stent implants in one artery, concentric lesions, and minimal intra-stent area < 3.88 mm² by IVUS.
Conclusions:
- Pharmacological stent implantation in the left anterior descending artery, guided and optimized by IVUS, demonstrates a low incidence of late adverse events.
- Implanting multiple stents for long lesions was a significant factor for late events.
- A final luminal area > 3.88 mm² is an independent predictor of an event-free outcome, especially in smaller vessels.
Background:
The efficacy of pharmacological stents in decreasing the incidence of cardiac events is not homogeneous for all lesions or patient subgroups.
Objective:
1) To evaluate the late clinical evolution of patients submitted to pharmacological stent implantation in atherosclerotic lesions of the left anterior descending artery; 2) to identify, among the clinical, angiographic and intravascular ultrasonographic characteristics, the ones predictive of cardiac event risk.
Methods:
From May 2002 to August 2005, 205 patients were treated with 236 pharmacological stent implants, guided by the intravascular US (IVUS).
Results:
After a mean follow-up period of 711 days, the rate of stent thrombosis was 0.48%, the same observed for acute myocardial infarction or revascularization surgery. The revascularization rate of the treated lesion was 7.31% and the general event rate was 10.24%. The event indicators, according to the multivariate analysis were the implant of more than one stent in the same artery, concentric lesions and the minimal intra-stent area measured by IVUS < 3.88 mm(2).
Conclusion:
Based on the data obtained, we conclude that the revascularization of the left anterior descending artery with pharmacological stent implant, chosen and optimized by IVUS, presents a low incidence of late events. The implant of two pharmacological stents for the treatment of long lesions was the main independent factor for the occurrence of late events. The final luminal area > 3.88 mm(2) obtained in the small reference-diameter segments is an independent indicator of event-free evolution.
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