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Medical compared with surgical treatment of asymptomatic carotid artery stenosis

T Brott1, J F Toole

  • 1University of Cincinnati Medical Center, Ohio, USA.

Annals of Internal Medicine
|November 1, 1995
PubMed

Insights

The Asymptomatic Carotid Atherosclerosis Study (ACAS) found carotid endarterectomy with aspirin and risk reduction superior to medication alone for preventing stroke in asymptomatic patients with significant carotid stenosis. Surgery offers a modest but favorable stroke prevention benefit when complication rates are low.

Area of Science:

  • Vascular Surgery
  • Neurology
  • Cardiovascular Medicine

Background:

  • The Asymptomatic Carotid Atherosclerosis Study (ACAS) investigated the efficacy of carotid endarterectomy in asymptomatic individuals with significant carotid artery stenosis.
  • The study compared surgical intervention plus medical management against medical management alone for stroke prevention.

Discussion:

  • Carotid endarterectomy, when combined with aspirin and risk factor reduction, demonstrated superiority over medical management alone in preventing ipsilateral stroke for asymptomatic patients with $\ge$60% carotid artery stenosis.
  • The absolute risk reduction over 5 years was modest (5.9%) but favorably compared to stroke prevention achieved with antihypertensive therapy in the elderly.
  • While the study favored surgery, results did not reach statistical significance for stroke prevention in women or for preventing major strokes.

Key Insights:

  • Carotid endarterectomy is recommended for stroke prevention in asymptomatic patients with hemodynamically significant carotid stenosis.
  • The benefits of surgery are most pronounced when performed by carefully selected surgical teams with low complication rates (2.3% combined arteriographic and perioperative mortality/stroke).
  • The decision for surgical intervention should consider the modest absolute risk reduction and potential benefits for specific patient subgroups.

Outlook:

  • Further research may explore optimizing patient selection criteria for carotid endarterectomy.
  • Continued monitoring of long-term outcomes and complication rates is essential for refining surgical recommendations.
  • Investigating the role of less invasive interventions may be a future direction in managing asymptomatic carotid stenosis.

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