title: Preoperative duplex on admission prevents unnecessary carotid surgery.
abstract: OBJECTIVE
  Our unit policy is to duplex on admission all patients undergoing carotid endarterectomy to confirm patency. The aim of this study was to evaluate whether this had led to avoidance of unnecessary carotid surgery in a significant number of patients.
  
  
  METHODS
  Over a 7-year period from January 1997 to December 2003, a total of 475 patients were scheduled for carotid endarterectomy. Of these, 439 patients subsequently underwent carotid endarterectomy. These data were obtained from prospectively collected vascular departmental records and we also hand searched notes of the 36 cancelled patients.
  
  
  RESULTS
  There were a total of 36 cancellations for various reasons. Of these, 8 were clearly occluded on duplex. A further 16 were highly suspicious of occlusion on duplex and thus surgery was deferred and selective angiography was undertaken. Of these 9 were confirmed to be occluded on angiogram and a further 4 had severe stenoses or virtual occlusion, 3 patients had a distal internal carotid artery occlusion. Thus a total of 24 patients had an occlusion either diagnosed directly on duplex or because of suspicion on duplex. Unnecessary carotid surgery was avoided in 24 of 475 (5%) of patients.
  
  
  CONCLUSIONS
  This study shows that a preoperative duplex on admission for surgery results in 1 of 20 patients avoiding unnecessary carotid surgery.
authors.affiliation: Nuffield Department of Surgery, John Radcliffe Hospital, Headington, Oxford OX3 9DU, UK.
authors.forename: K
authors.initials: K
authors.lastname: Devalia
authors.forename: J
authors.initials: J
authors.lastname: Riches
authors.forename: L
authors.initials: L
authors.lastname: Hands
authors.forename: A
authors.initials: A
authors.lastname: Handa
mesh_terms: D016893:Carotid Stenosis / Q000000981:diagnostic imaging* / Q000473:pathology / Q000601:surgery*; D016894:Endarterectomy, Carotid; D006801:Humans; D012189:Retrospective Studies; D018616:Ultrasonography, Doppler, Duplex / Q000706:statistics & numerical data*; D019564:Unnecessary Procedures