[Analysis of pooled data from the randomized controlled trials of endarterectomy for symptomatic carotid stenosis]
1Service de Chirurgie Cardio-Vasculaire et Thoracique, CHU Sart Tilman, Liège. hvandamme@chu.ulg.ac.be
Insights
Carotid endarterectomy surgery provides marginal benefit for moderate symptomatic carotid artery stenosis but is highly beneficial for severe stenosis (70-99%), reducing stroke risk. Benefit is uncertain for near-occlusion.
Area of Science:
- Vascular Surgery
- Neurology
- Clinical Trials
Context:
- Carotid artery disease management requires clear definitions and evidence-based treatment guidelines.
- Symptomatic internal carotid artery stenosis poses a significant stroke risk.
- Optimal medical therapy versus surgical intervention is a key clinical question.
Purpose:
- To analyze pooled data from randomized trials comparing carotid endarterectomy with optimal medical therapy for symptomatic internal carotid artery stenosis.
- To standardize stenosis measurements and outcome definitions for comparable trial results.
- To clarify the surgical benefit across different degrees of stenosis.
Summary:
- Analysis of 6092 patients from three randomized trials (35,000 patient-years follow-up) comparing carotid endarterectomy to medical therapy.
- Surgery offers a 4.6% absolute risk reduction in ipsilateral stroke at 5 years for moderate (50-69%) symptomatic stenosis.
- Surgery shows a significant 16% absolute risk reduction in ipsilateral stroke at 5 years for severe (70-99%) symptomatic stenosis.
- Surgical benefit is uncertain for symptomatic near-occlusion (99% stenosis).
Impact:
- Provides evidence to guide treatment decisions for symptomatic internal carotid artery stenosis.
- Highlights the differential benefit of carotid endarterectomy based on stenosis severity.
- Informs clinical practice guidelines for managing patients at risk of ischemic stroke.
Abstract:
It is important to establish clear definitions concerning carotid artery disease, a topic that recently regained widespread interest in medical literature. Therefore, we summarize a paper of Rothwell and Barnett, recently published in the Lancet 2003 (1). In their analysis, the data of three randomized trials, comparing carotid endarterectomy to optimal medical therapy alone for a symptomatic internal carotid artery stenosis, were pooled after standardization of the measurement of the degree of stenosis and redefinition of the outcome events, to achieve comparability of the results of each trial. This analysis concerns 6092 patients with 35,000 patient-years of follow-up. Surgery offers a marginal benefit for patients with a moderate (50-69%) symptomatic carotid artery stenosis (absolute risk reduction of 4.6% for subsequent ipsilateral stroke at 5 years). Surgery is highly beneficial for patients with a symptomatic 70-99% stenosis (absolute risk reduction of 16% for ipsilateral stroke at 5 years). The benefit is uncertain for a symptomatic "near occlusion" (99% with retarded opacification of the distal internal carotid artery): absolute risk reduction of -1.7% for ipsilateral stroke at 5 years).
