Overiew:
The aortic size index (ASI) is a means of adjusting the absolute aortic diameter to take into account the patient's physical size. This can help to identify a patient with an aortic aneurysm who is at increased risk for complications. The authors are fromo Yale University.
Parameters:
(1) aortic diameter in cm
(2) body surface area in square meters
ASI =
= (aortic diameter in cm) / (BSA)
Units: cm per square meter BSA
For a patient with a thoracic aortic aneurysm, the ASI correlated with the risk of major complications (rupture, dissection and/or death).
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ASI
|
Risk of Outcome
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< 2.75
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low (4% per year)
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2.75 to 4.24
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moderate (8% per year)
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> 4.24
|
high (20% per year)
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