title: Trends in use and yield of chest computed tomography with angiography for diagnosis of pulmonary embolism in a Connecticut hospital emergency department.
abstract: BACKGROUND
  We hypothesize that the ready availability of chest computed tomography (CT) scan, with angiography (CTA), for pulmonary embolism (PE) has resulted in its increased use in the emergency department (ED) with an associated decrease in positive studies.
  
  
  RESULTS
  CTA for diagnosis of PE increased over 13-fold from 2000 to 2005. The diagnostic yield of CTA for PE decreased from 14% in 2000 to a mean (SD) of 7.2 (.91)% during subsequent years (P =.007). No significant change in yield occurred after 2001 (P = 0.51). Significantly more segmental and subsegmental embolisms were observed with the 16-slice CT in years 2004-2005 when compared to the single-slice CT used in years 2000-2003.
  
  
  CONCLUSIONS
  CTA for PE in our hospital ED has a low-positive yield rate, suggesting overutilization. However, the positive-yield rate remained steady despite increasing numbers of CTA, suggesting increased detection of PE and/or false-positive CTA.
authors.affiliation: Norwalk Hospital, Section of Pulmonary and Critical Care Medicine, USA.
authors.forename: Ian D
authors.initials: ID
authors.lastname: Weir
authors.forename: Frank
authors.initials: F
authors.lastname: Drescher
authors.forename: Daniel
authors.initials: D
authors.lastname: Cousin
authors.forename: Ezra T
authors.initials: ET
authors.lastname: Fraser
authors.forename: Ronald
authors.initials: R
authors.lastname: Lee
authors.forename: Lewis
authors.initials: L
authors.lastname: Berman
authors.forename: Edward
authors.initials: E
authors.lastname: Strauss
authors.forename: Yun
authors.initials: Y
authors.lastname: Wang
authors.forename: Jonathan M
authors.initials: JM
authors.lastname: Fine
mesh_terms: D000792:Angiography / Q000706:statistics & numerical data*; D016009:Chi-Square Distribution; D015897:Comorbidity; D003237:Connecticut / Q000453:epidemiology; D004636:Emergency Service, Hospital; D005260:Female; D006801:Humans; D016015:Logistic Models; D008297:Male; D008875:Middle Aged; D011655:Pulmonary Embolism / Q000000981:diagnostic imaging* / Q000453:epidemiology; D012189:Retrospective Studies; D014057:Tomography, X-Ray Computed / Q000706:statistics & numerical data*