II. Indication

  1. Suspected Pulmonary Embolism
    1. Patients too unstable to undergo VQ Scan
  2. Aortic Dissection
    1. Aortic Dissection assessment (consider CT angiogram as alternative)
  3. Thoracic Aortic Aneurysm

III. Accuracy

  1. Aortic Dissection
    1. Sensitivity: 97%
    2. Specificity: 75-90%

IV. Advantage

  1. Sensitive for hemodynamically significant emboli
  2. Less invasive
  3. Fast
  4. Widely available

V. Disadvantage

  1. Misses small Pulmonary Emboli (only 13% sensitive)
  2. Requires Sedation and trained technician

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