Carotid endarterectomy: trials and tribulations
1Department of Clinical Neurosciences, Brown University, Rhode Island Hospital, Providence 02903.
Annals of Neurology
|January 1, 1994
Summary
Carotid endarterectomy is effective for symptomatic carotid stenosis over 70%. However, trials show no significant benefit for asymptomatic patients, though larger studies are ongoing to confirm findings.
Area of Science:
- Vascular Surgery
- Neurology
- Clinical Trials
Background:
- The efficacy of carotid endarterectomy for carotid artery stenosis has been debated for decades.
- Several major clinical trials were launched in the 1980s to assess surgical benefits for symptomatic and asymptomatic patients.
Purpose of the Study:
- To evaluate the effectiveness of carotid endarterectomy in preventing stroke and death.
- To analyze results from key trials like NASCET, ECST, and VA studies for both symptomatic and asymptomatic carotid stenosis.
Main Methods:
- Analysis of interim and final results from landmark randomized controlled trials.
- Comparison of surgical intervention versus medical management (e.g., aspirin) in specific patient groups.
- Review of subgroup analyses and trial designs to understand variable risk and applicability.
Main Results:
- Carotid endarterectomy demonstrated efficacy for symptomatic patients with >70% stenosis (NASCET, ECST).
- Trials involving asymptomatic patients did not show a statistically significant surgical benefit for stroke prevention.
- Some asymptomatic trials were underpowered to definitively exclude a small benefit.
Conclusions:
- Surgery is beneficial for select symptomatic carotid stenosis patients.
- The role of carotid endarterectomy in asymptomatic patients remains uncertain, necessitating further large-scale research.
- Trial design and patient selection critically influence the interpretation of carotid endarterectomy outcomes.
