Related Experiment Videos
The Proliferation REduction with Vascular ENergy Trial (PREVENT)
Albert E Raizner1, Grzegorz L Kaluza
1The Methodist DeBakey Heart Center and Baylor College of Medicine, Houston, Texas, USA. araizner@tmh.tmc.edu
Current Controlled Trials in Cardiovascular Medicine
|January 25, 2002
Summary
Intracoronary beta radiotherapy significantly reduced restenosis after stenting or angioplasty. However, adjacent stenosis and late thrombotic events limited the overall clinical benefit of this radiation therapy.
Area of Science:
- Cardiology
- Interventional Cardiology
- Radiation Oncology
Background:
- Restenosis remains a significant complication after percutaneous coronary interventions.
- Intracoronary brachytherapy has been explored as a method to prevent neointimal hyperplasia and restenosis.
Purpose of the Study:
- To evaluate the efficacy and safety of intracoronary beta radiotherapy using 32P in preventing restenosis.
- To assess the impact of different radiation doses on restenosis rates.
Main Methods:
- Prospective, randomized, placebo-controlled trial (PREVENT study).
- 105 patients with de novo or restenotic coronary lesions underwent stenting or balloon angioplasty.
- Patients received intracoronary beta radiotherapy with 32P at doses of 0 (control), 16, 20, or 24 Gy to a depth of 1 mm.
Main Results:
- Significantly lower rates of restenosis (≥50% diameter stenosis) were observed in the radiotherapy groups compared to the control group at the target site (8% vs. 39%, P=0.012).
- Restenosis rates were also lower when considering the target site plus adjacent segments (22% vs. 50%, P=0.018).
- However, stenosis in adjacent segments and late thrombotic events diminished the overall clinical benefit.
Conclusions:
- Intracoronary beta radiotherapy with 32P demonstrated significant efficacy in reducing restenosis at the target lesion site following coronary interventions.
- The clinical benefit was partially offset by issues related to adjacent segment disease and late thrombotic events, highlighting the need for further optimization.