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Percutaneous intervention of old degenerated saphenous vein grafts
Jose A Silva1, Christopher J White
1Department of Cardiology Ochsner Heart and Vascular Institute, New Orleans, Louisiana, USA.
Insights
Treating failing bypass grafts is challenging. Newer techniques like rheolytic thrombectomy and distal protection devices show promise for percutaneous intervention in saphenous vein grafts (SVG), reducing complications.
Area of Science:
- Cardiovascular Medicine
- Interventional Cardiology
- Vascular Surgery
Background:
- Failing bypass grafts pose treatment challenges due to high surgical mortality and percutaneous intervention risks.
- Degenerated saphenous vein grafts (SVG) are particularly difficult to treat with traditional methods like balloon angioplasty.
- Previous interventions like directional atherectomy and transluminal extraction catheters (TEC) have shown limitations.
Purpose of the Study:
- To review the challenges and evolving percutaneous strategies for treating failing bypass grafts, specifically degenerated saphenous vein grafts (SVG).
- To evaluate the efficacy and limitations of various percutaneous interventions for SVG lesions.
- To highlight recent advancements and their potential impact on patient outcomes.
Main Methods:
- Review of existing literature on percutaneous interventions for failing bypass grafts and SVG.
- Analysis of outcomes from randomized trials comparing different percutaneous techniques.
- Discussion of emerging technologies such as rheolytic thrombectomy and distal protection devices.
Main Results:
- Balloon angioplasty has significant limitations in degenerated SVG.
- Directional atherectomy and TEC have shown procedural complications and limited success in vein grafts.
- Stenting improved major adverse cardiovascular events compared to balloon angioplasty, but restenosis rates were similar.
- Rheolytic thrombectomy and mechanical thrombolysis are effective for thrombotic SVG lesions.
- Distal protection devices show promise in reducing embolization.
Conclusions:
- Percutaneous treatment of failing bypass grafts, especially SVG, remains complex with significant risks.
- Recent advancements like rheolytic thrombectomy and distal protection devices offer improved safety and efficacy.
- Further research and adoption of these newer technologies are crucial for better patient outcomes in SVG revascularization.
Abstract:
The treatment of failing bypass grafts is difficult because repeat surgery carries a higher mortality rate than a first operation. Percutaneous intervention is more difficult because mechanical manipulation of these soft, friable atherosclerotic plaques have been associated with a significant rate of distal embolization, myocardial infarction, late restenosis and death. Balloon angioplasty alone has proven to have serious limitations in the treatment of older degenerated saphenous vein grafts (SVG). Although directional atherectomy yielded a higher angiographic success in a randomized trial, the restenosis rate was similar, and the procedural complications higher. The transluminal extraction catheter (TEC) has also shown significant limitations for the treatment of degenerated or thrombotic vein grafts with a significant procedural complication rate. A randomized trial comparing stenting versus balloon angioplasty in focal SVG lesions showed a higher freedom from major adverse cardiovascular events in the stent group, but there was no significant difference in the angiographic restenosis rates. More recently, rheolytic thrombectomy and mechanical thrombolysis have proven useful in treating thrombotic lesions in SVG. In addition, the recent development of distal protection devices appears very promising and will probably contribute to decreased distal embolization during percutaneous revascularization of these conduits.