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Consequences of restenosis after coronary angioplasty
R E Vlietstra1, D R Holmes, R J Rodeheffer
1Division of Cardiovascular Diseases, Mayo Clinic, Rochester, Minnesota 55905.
Insights
Restenosis after angioplasty significantly increases the need for repeat procedures like angioplasty or bypass grafting. However, it does not appear to raise the risk of heart attack or death in the long term.
Area of Science:
- Cardiology
- Interventional Cardiology
- Vascular Biology
Background:
- Restenosis, the re-narrowing of an artery after angioplasty, is a significant complication.
- Understanding the long-term consequences of restenosis is crucial for patient management and treatment strategies.
Purpose of the Study:
- To evaluate the long-term clinical consequences of restenosis following successful coronary angioplasty.
- To compare the risks of revascularization, myocardial infarction, and death between patients with and without restenosis.
Main Methods:
- A cohort of 466 patients undergoing successful coronary angioplasty were assessed for restenosis via angiography 3-12 months post-procedure.
- Patients were followed long-term to compare outcomes, including repeat revascularization procedures, myocardial infarction, and mortality.
Main Results:
- Patients with restenosis had a significantly higher 5-year risk of revascularization (repeat angioplasty or coronary artery bypass grafting) compared to those without restenosis.
- The relative risk of repeat angioplasty was 4.26 times higher, and the risk of coronary artery bypass grafting was 3.68 times higher in the restenosis group.
- No significant difference in the risk of myocardial infarction or death was observed between the groups.
- Patients with both incomplete revascularization and restenosis experienced the worst outcomes, with 50% requiring coronary artery bypass grafting within 5 years.
Conclusions:
- Early restenosis after angioplasty markedly increases the likelihood of subsequent revascularization procedures but has minimal impact on myocardial infarction or mortality.
- Addressing restenosis could potentially halve the need for revascularization over a 5-year period.
- Even in the absence of early restenosis, further revascularization procedures remain common.
Abstract:
The consequences of restenosis after angioplasty were evaluated in 466 patients who had coronary angiography 3 to 12 months after successful coronary angioplasty and were followed long term. The 236 subjects with restenosis resembled the 230 without restenosis with respect to age, sex, presence of multivessel disease, mean ejection fraction, prior myocardial infarction, prior coronary artery bypass grafting, and completeness of revascularization. The 5-year relative risk of revascularization for patients with restenosis markedly exceeded that for patients without restenosis. The relative risk of repeat angioplasty in the former group was 4.26 times that in the latter group (95% confidence interval, 2.80 to 6.51), and the risk of coronary artery bypass grafting in patients with restenosis was 3.68 (95% confidence interval, 2.16 to 6.28). There was no difference between the 2 groups in the relative risk of myocardial infarction or death. When the completeness of revascularization was considered, patients with incomplete revascularization and restenosis had the worst outcomes, with 50% needing coronary artery bypass grafting within 5 years. Early restenosis markedly increases the probability of revascularization, but it has little effect on infarction or mortality. Even when early restenosis is absent, further revascularization procedures are still frequent. A solution to the problem of restenosis might reduce by half the need for revascularization during the subsequent 5 years.