title: Duplex ultrasound scanning (DUS) versus computed tomography angiography (CTA) in the follow-up after EVAR.
abstract: BACKGROUND
  Computed tomography angiography (CTA) is the gold standard follow-up modality after endovascular aneurysm repair (EVAR). A potential alternative noninvasive and less expensive modality is duplex ultrasound scanning (DUS).
  
  
  METHODS
  We studied 314 follow-up paired scans (DUS and CTA) in 59 patients with EVAR.
  
  
  RESULTS
  Endoleak--Endoleak was detected in 23.7% patients. The sensitivity and specificity rates of DUS were 54% and 95.3%, respectively. All 9 endoleaks that needed secondary intervention were detected on DUS. Eight of those were identified within a year after EVAR. Sac size--The mean difference in maximum diameter between the DUS and CTA was < or =5 mm in 84.5% of cases and < or =10 mm in 97.1%. Graft patency--There was 100% agreement between CTA and DUS.
  
  
  CONCLUSIONS
  Duplex ultrasound scanning was reliable as it detected all the leaks that needed reintervention after EVAR. Duplex ultrasound scanning showed similar results to CTA in detecting sac size and patency.
authors.affiliation: Department of Vascular Surgery, Queen Elizabeth Hospital, Gateshead, United Kingdom.
authors.forename: Hassan
authors.initials: H
authors.lastname: Badri
authors.forename: Mohammed
authors.initials: M
authors.lastname: El Haddad
authors.forename: Hamdy
authors.initials: H
authors.lastname: Ashour
authors.forename: Colin
authors.initials: C
authors.lastname: Nice
authors.forename: Grace
authors.initials: G
authors.lastname: Timmons
authors.forename: Vish
authors.initials: V
authors.lastname: Bhattacharya
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D000792:Angiography / Q000379:methods*; D017544:Aortic Aneurysm, Abdominal / Q000601:surgery*; D019917:Blood Vessel Prosthesis Implantation; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011182:Postoperative Care; D011183:Postoperative Complications / Q000175:diagnosis*; D012189:Retrospective Studies; D012680:Sensitivity and Specificity; D015607:Stents; D014057:Tomography, X-Ray Computed; D018616:Ultrasonography, Doppler, Duplex; D014654:Vascular Patency