title: Is assessment of popliteal artery diameter in patients undergoing screening for abdominal aortic aneurysms a worthwhile procedure.
abstract: OBJECTIVE
  The aim of this study was to assess whether screening of popliteal arteries in patients undergoing ultrasound screening of their abdominal aortas was worthwhile.
  
  
  METHODS
  All male patients undergoing ultrasound screening for abdominal aortic aneurysm (AAA) during the period February 2000 to June 2002 were offered scanning of their popliteal arteries. All scans were performed by a single, trained operator using a Sonosite 180.
  
  
  RESULTS
  Four hundred and forty-nine patients underwent screening and thus 898 popliteal arteries were assessed. The mean aortic diameter was 2.1 standard deviations (SD) 0.5 cm and the upper limit of normal (2 SD) was 2.7 cm. The mean diameter of the popliteal arteries was 0.74 SD 0.11 and the upper limit of normal was 0.96 cm. Thirty patients had aortic diameters greater than 2.5 cm (ectatic or aneurysmal aortas) but based on a popliteal diameter of 2 cm, no popliteal aneurysms were detected. However, 39 (4.3%) popliteal arteries measured > or = 1 cm (> mean+2 SD); 3/60 (5%) in the ectatic/AAA subgroup and 36/838 (4.3%) in the non-AAA subgroup.
  
  
  CONCLUSIONS
  This study has shown that, using conventional definitions, the imaging of popliteal arteries during screening for AAAs does not detect any popliteal aneurysms and is thus of limited value. However, if a definition of popliteal aneurysm of > or = 1 cm (based on mean+2 SD) is used then 39/898 (4.3%) of arteries would be regarded as having abnormal diameters and may require surveillance.
authors.affiliation: Department of Surgery, Royal Glamorgan Hospital, Unysmaerdy, Llantrisant, Rhondda Cynon Taf, UK. garethmorrisstiff@hotmail.com
authors.forename: G
authors.initials: G
authors.lastname: Morris-Stiff
authors.forename: M
authors.initials: M
authors.lastname: Haynes
authors.forename: S
authors.initials: S
authors.lastname: Ogunbiyi
authors.forename: E
authors.initials: E
authors.lastname: Townsend
authors.forename: S
authors.initials: S
authors.lastname: Shetty
authors.forename: R K
authors.initials: RK
authors.lastname: Winter
authors.forename: M H
authors.initials: MH
authors.lastname: Lewis
mesh_terms: D017544:Aortic Aneurysm, Abdominal / Q000000981:diagnostic imaging*; D006801:Humans; D008297:Male; D008403:Mass Screening / Q000379:methods*; D008875:Middle Aged; D015588:Observer Variation; D011150:Popliteal Artery / Q000000981:diagnostic imaging*; D011237:Predictive Value of Tests; D015203:Reproducibility of Results; D012189:Retrospective Studies; D012307:Risk Factors; D014463:Ultrasonography