title: Abdominal aortic aneurysm development in men following a "normal" aortic ultrasound scan.
abstract: OBJECTIVE
  To determine predictors related to abdominal aortic aneurysm (AAA) development following a "normal" aortic ultrasound scan.
  
  
  METHODS
  Over a 23-year period, 22 961 men participated in an AAA screening programme. Maximum aortic diameter of less than 30 mm was deemed "normal". 4308 of these "normal" individuals were later re-scanned at intervals for research purposes.
  
  
  RESULTS
  AAA prevalence was 4.4% at initial scanning. In those with a normal scan, 46 patients subsequently presented with AAAs incidentally detected and 120 (2.8%) had AAAs identified as part of the ongoing surveillance. The median initial aortic size of these 166 men was 25 mm (range 15-29 mm). Over the follow-up period, there have been 24 (14%) AAA-related deaths, 24 patients underwent successful AAA surgery and 36 died of unrelated causes. In those with an initial aortic diameter of <25 mm who later developed an AAA, the odds ratio for AAA-related mortality was 2 (95% CI 1-4.1, p=0.03, x(2)).
  
  
  CONCLUSIONS
  AAAs can develop following an initial "normal" scan and men with an aortic diameters of 25-29 mm appear to be at greater risk. Surveillance for this sub-group may further reduce the incidence of undiagnosed AAA and AAA-related mortality.
authors: Department of Vascular Surgery, St Richard's Hospital, Chichester, West Sussex, PO19 6SE, UK. hany.hafez@rws-tr.nhs.uk
authors: H
authors: H
authors: Hafez
authors: P S
authors: PS
authors: Druce
authors: H A
authors: HA
authors: Ashton
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D001011:Aorta / Q000000981:diagnostic imaging*; D017544:Aortic Aneurysm, Abdominal / Q000000981:diagnostic imaging* / Q000401:mortality / Q000601:surgery; D018450:Disease Progression; D006801:Humans; D033162:Incidental Findings; D008297:Male; D008403:Mass Screening / Q000379:methods*; D008875:Middle Aged; D016017:Odds Ratio; D011237:Predictive Value of Tests; D012189:Retrospective Studies; D018570:Risk Assessment; D012307:Risk Factors; D013997:Time Factors; D014463:Ultrasonography