title: Asymptomatic carotid stenosis: how should it be managed?
abstract: OBJECTIVE
  To discuss the implications of recent studies on carotid endarterectomy for asymptomatic carotid stenosis.
  
  
  METHODS
  Trials of the effectiveness of carotid endarterectomy in asymptomatic carotid stenosis, including the Asymptomatic Carotid Atherosclerosis Study (ACAS).
  
  
  RESULTS
  In the ACAS study, carotid endarterectomy for asymptomatic moderate to severe carotid stenosis (60%-99% luminal obstruction) reduced the absolute risk of ipsilateral stroke or death at five years by 5.9%. This means that about 17 patients need to be operated on to prevent one stroke or death over five years. To operate on all Australians with asymptomatic 60%-99% carotid stenosis would cost an estimated $A1.24 billion and prevent 800 strokes per year, or only 3% of all first strokes in Australia.
  
  
  CONCLUSIONS
  In order to identify who will benefit from carotid endarterectomy and who will remain symptom-free without it, patients should continue to be allocated to the ongoing Asymptomatic Carotid Surgery Trail. Otherwise, carotid endarterectomy should be reserved for patients at high risk of stroke (i.e., with 95%-99% carotid stenosis) who are medically fit for surgery and willing to take the small short term risk of surgery for a possible greater long term benefit.
authors.affiliation: Department of Neurology, Royal Perth Hospital, WA.
authors.forename: G J
authors.initials: GJ
authors.lastname: Hankey
mesh_terms: D000328:Adult; D000368:Aged; D001315:Australia; D002339:Carotid Arteries / Q000000981:diagnostic imaging; D016893:Carotid Stenosis / Q000000981:diagnostic imaging / Q000601:surgery* / Q000628:therapy; D002561:Cerebrovascular Disorders / Q000209:etiology / Q000517:prevention & control*; D016894:Endarterectomy, Carotid / Q000009:adverse effects / Q000191:economics; D017048:Health Care Costs; D006801:Humans; D008875:Middle Aged; D011859:Radiography; D016032:Randomized Controlled Trials as Topic; D012306:Risk