title: Frequency of pulmonary embolism in patients with low-probability lung scan and negative lower extremity venous ultrasound.
abstract: OBJECTIVE
  To define the prevalence of pulmonary embolism (PE) in patients who are undergoing pulmonary arteriography because of a high clinical suspicion for PE but who have had a low-probability lung scan and a negative lower extremity venous ultrasound examination.
  
  
  METHODS
  A retrospective review of the medical records of 365 consecutive patients who underwent pulmonary arteriograms for suspected PE was undertaken.
  
  
  RESULTS
  Of the 365 pulmonary arteriograms, 62 were performed in patients with suspected PEs despite a low-probability lung scan and a negative lower extremity venous ultrasound examination. In the latter group, five patients (8%; 95% confidence interval, 2.7% to 18%) had PEs revealed on the arteriogram.
  
  
  CONCLUSIONS
  In patients whose presentation provokes a high clinical suspicion for PE despite having had a low-probability lung scan, a negative lower extremity venous ultrasound examination is insufficient to preclude proceeding to pulmonary angiography.
authors: Department of Radiology, Brigham and Women's Hospital and Harvard Medical School, Boston, MA 02115, USA.
authors: M F
authors: MF
authors: Meyerovitz
authors: F
authors: F
authors: Mannting
authors: J F
authors: JF
authors: Polak
authors: S Z
authors: SZ
authors: Goldhaber
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000792:Angiography; D005260:Female; D006801:Humans; D007866:Leg / Q000098:blood supply*; D008168:Lung / Q000098:blood supply; D008297:Male; D008875:Middle Aged; D011655:Pulmonary Embolism / Q000150:complications / Q000000981:diagnostic imaging*; D011877:Radionuclide Imaging; D012189:Retrospective Studies; D014463:Ultrasonography; D020246:Venous Thrombosis / Q000150:complications / Q000000981:diagnostic imaging*