title: Venous duplex scanning for unilateral symptoms: when do we need a contralateral evaluation?
abstract: OBJECTIVE
  Determine the need for bilateral duplex scanning (DS) in patients with unilateral symptoms of acute DVT of the leg.
  
  
  METHODS
  Prospective study.
  
  
  METHODS
  One thousand, one hundred and sixty-one consecutive patients with recent unilateral symptoms of pain or swelling.
  
  
  METHODS
  Bilateral DS were performed and demographic data including risk factors for DVT were entered into a computerised database.
  
  
  RESULTS
  Of the 250 cases (22%) of acute DVT, thrombus was confined to the symptomatic limb in 80% (200/250) and to the asymptomatic limb (AL) in 5% (12/250), while bilateral DVT was found in 15% (38/250). The management was not altered by the contralateral DS findings in any patient with bilateral thrombus. Ten of the 12 cases of DVT confined to the AL were localised to the infrapopliteal level; advanced malignancy, recent joint surgery or hypercoagulability were noted in nine patients, including all those requiring treatment.
  
  
  CONCLUSIONS
  In the presence of unilateral symptoms of DVT, we recommend DS of the symptomatic extremity only; bilateral examination should be confined to patients with normal duplex findings in the symptomatic limb following recent joint surgery, or in the presence of advanced malignancy or hypercoagulability. Bilateral DS would therefore be required in approximately 11% of cases with unilateral symptoms of DVT.
authors.affiliation: Department of Surgery, Sir Mortimer B. Davis Jewish General Hospital, McGill University, Montreal, Canada.
authors.forename: N
authors.initials: N
authors.lastname: Miller
authors.forename: D
authors.initials: D
authors.lastname: Obrand
authors.forename: L
authors.initials: L
authors.lastname: Tousignant
authors.forename: I
authors.initials: I
authors.lastname: Gascon
authors.forename: M
authors.initials: M
authors.lastname: Rossignol
mesh_terms: D000208:Acute Disease; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D012307:Risk Factors; D013924:Thrombophlebitis / Q000000981:diagnostic imaging* / Q000209:etiology; D018616:Ultrasonography, Doppler, Duplex