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The stenotic stent: mechanisms and revascularization options
1Cardiac Catheterization Laboratories, McGuire VA Medical Center, Richmond 23249, USA.
Insights
Coronary artery stents significantly reduce restenosis compared to balloon angioplasty. Balloon angioplasty remains a highly successful treatment for stent restenosis, with low complication rates.
Area of Science:
- Interventional Cardiology
- Vascular Biology
Background:
- Randomized studies show coronary artery stenting reduces restenosis compared to balloon angioplasty for de novo lesions.
- Stent restenosis rates vary widely (14-60%) based on patient factors, stent type, lesion location, and procedural outcomes.
Observation:
- De novo lesions have the lowest restenosis rates.
- Multiple stents and saphenous vein graft lesions show the highest restenosis rates.
- Focal intrastent stenoses are more amenable to treatment than diffuse occlusions.
Findings:
- Balloon angioplasty is a highly successful treatment for stent restenosis with a low complication incidence.
- Atherectomy is not recommended for intrastent stenosis.
- Laser angioplasty is an option for complex intrastent lesions unsuitable for balloon angioplasty.
Implications:
- Balloon angioplasty is a safe and effective revascularization strategy for stent restenosis.
- Patient and lesion characteristics influence restenosis risk and treatment approach.
- Anticoagulation is generally not required after balloon angioplasty for stent restenosis unless specific complications arise.
Abstract:
As demonstrated by the two recent randomized studies of elective, single stent placement versus balloon angioplasty of de novo lesions in the coronary arteries, angiographic restenosis occurs significantly less after stent implantation. However, reported stent restenosis rate varies from 14% to more than 60%, depending on patient characteristics, stent design, number of stents implanted, vessel treated, location of the lesion, and acute luminal gain. The lowest rate of stenosis occurs in de novo lesions. The highest rate of stent restenosis is encountered in multiple stents and in ostial saphenous vein graft lesions. Stent restenosis can be treated with balloon angioplasty with very high success rates. This treatment is associated with remarkably low incidence of complications. Focal stenoses within the stent are more easily treated than are diffuse occlusions. Atherectomy of intrastent stenosis is not recommended. Excimer and holmium: YAG lasers can be applied for revascularization of intrastent lesions considered "not ideal" for balloon angioplasty. Unless thrombus is present or significant dissection detected or angioplasty performed within 2 months following stenting, patients do not require anticoagulants following balloon angioplasty of stent restenosis.