title: Timing and frequency of perioperative carotid color-flow duplex scanning: A preliminary report.
abstract: OBJECTIVE
  The results of intraoperative and early postoperative carotid color-flow duplex scanning (CFS) after endarterectomy were reviewed to determine whether any perioperative studies could be eliminated.
  
  
  METHODS
  Patients undergoing carotid endarterectomy with intraoperative CFS between 1986 and 1997 were identified. Early postoperative CFS was performed between 1 day and 3 weeks postoperatively, then it was performed again at 6 months postoperatively.
  
  
  RESULTS
  During the study period, 560 patients, 325 men and 235 women, underwent 621 carotid endarterectomies. A satisfactory intraoperative carotid CFS was completed in 611 (98.4%) patients. There were 20 (3.2%) vessels with a major defect that required revision for fronds or flaps (n = 11), retained atheroma (n = 5), low flow (n = 2), high velocity or turbulence (n = 1), or dissection (n = 1). Another 146 vessels (23.5%) had minor defects, such as retained proximal atheromas or small (less than 3 mm) fronds, but were not revised. The remaining 445 vessels were normal. The first postoperative CFS was normal in all the revised carotids and in 138 (94.5%) vessels with minor intraoperative defects. At 6 months, recurrent stenosis (more than 75% area reduction) was identified in 1 of 18 revised carotids (5.5%), 4 of 138 vessels (2. 9%) with minor defects, and 17 of 406 vessels (4.2%) that were normal intraoperatively. The incidence of recurrent stenosis was not significantly different in the three groups (P =.7).
  
  
  CONCLUSIONS
  Intraoperative CFS is useful because major unsuspected defects can be corrected immediately, thus avoiding potential neurologic morbidity. However, the postoperative day 1 CFS can be eliminated in most cases, because it does not provide any relevant clinical information.
authors.affiliation: Department of Surgery, Division of Peripheral Vascular Surgery, Loyola University Stritch School of Medicine, Maywood, Ill. 60153-3304, USA.
authors.forename: M A
authors.initials: MA
authors.lastname: Mansour
authors.forename: K M
authors.initials: KM
authors.lastname: Webb
authors.forename: S S
authors.initials: SS
authors.lastname: Kang
authors.forename: N
authors.initials: N
authors.lastname: Labropoulos
authors.forename: F N
authors.initials: FN
authors.lastname: Littooy
authors.forename: H P
authors.initials: HP
authors.lastname: Greisler
authors.forename: W H
authors.initials: WH
authors.lastname: Baker
mesh_terms: D000368:Aged; D002339:Carotid Arteries / Q000000981:diagnostic imaging*; D016893:Carotid Stenosis / Q000000981:diagnostic imaging* / Q000601:surgery; D016894:Endarterectomy, Carotid; D005260:Female; D006801:Humans; D007430:Intraoperative Care; D008297:Male; D008875:Middle Aged; D011184:Postoperative Period; D012189:Retrospective Studies; D018615:Ultrasonography, Doppler, Color