title: Systematic review of emergency physician-performed ultrasonography for lower-extremity deep vein thrombosis.
abstract: OBJECTIVE
  The authors performed a systematic review to evaluate published literature on diagnostic performance of emergency physician-performed ultrasonography (EPPU) for the diagnosis and exclusion of deep venous thrombosis (DVT).
  
  
  METHODS
  Structured search criteria were used to query MEDLINE and EMBASE, followed by a hand search of published bibliographies. Relevance and inclusion criteria required prospective investigation of emergency department (ED) outpatients with suspected DVT; diagnostic evaluations had to consist of EPPU followed by criterion standard (radiology-performed) imaging. Two authors independently extracted data from included studies; study quality was assessed utilizing a validated tool for quality assessment of diagnostic accuracy studies (QUADAS). Pooled data were analyzed using an unweighted summary receiver-operating-characteristic (SROC) curve; sensitivity and specificity were estimated using a random effects model.
  
  
  RESULTS
  The initial search yielded 1,162 publications. Relevance screening and selection yielded six articles including 936 patients. Four of the six studies reported adequate blinding but a number of other methodologic flaws were identified. A random effects model yielded an overall sensitivity of 0.95 (95% confidence interval [CI] = 0.87 to 0.99) and specificity of 0.96 (95% CI = 0.87 to 0.99).
  
  
  CONCLUSIONS
  Systematic review of six studies suggests that EPPU may be accurate for the diagnosis of DVT compared with radiology-performed ultrasound (US). However, given the methodologic limitations identified among the primary studies, the estimates of diagnostic test performance may be overly optimistic. Further research into EPPU for suspected DVT is needed before it can be adopted into routine clinical practice.
authors.affiliation: Department of Emergency Medicine, Carolinas Medical Center, Charlotte, NC, USA.
authors.forename: Patrick R
authors.initials: PR
authors.lastname: Burnside
authors.forename: Michael D
authors.initials: MD
authors.lastname: Brown
authors.forename: Jeffrey A
authors.initials: JA
authors.lastname: Kline
mesh_terms: D004636:Emergency Service, Hospital; D006801:Humans; D035002:Lower Extremity / Q000098:blood supply*; D012372:ROC Curve; D014463:Ultrasonography; D020246:Venous Thrombosis / Q000000981:diagnostic imaging*