II. Indication
- Suspected Pulmonary Embolism
- Patients too unstable to undergo VQ Scan
-
Aortic Dissection
- Aortic Dissection assessment (consider CT angiogram as alternative)
- Thoracic Aortic Aneurysm
III. Accuracy
-
Aortic Dissection
- Sensitivity: 97%
- Specificity: 75-90%
IV. Advantage
- Sensitive for hemodynamically significant emboli
- Less invasive
- Fast
- Widely available
V. Disadvantage
- Misses small Pulmonary Emboli (only 13% sensitive)
- Requires Sedation and trained technician
