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ARSI Formula:
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The Aortic Root Size Index (ARSI) indexes aortic root diameter to body surface area, providing a normalized measurement that accounts for patient size. It is commonly used in cardiology to assess aortic dimensions relative to body habitus.
The calculator uses the ARSI formula:
Where:
Explanation: This indexation allows for better comparison of aortic root dimensions across patients of different sizes, making it particularly useful in pediatric populations and for assessing aortic dilation.
Details: ARSI is crucial for diagnosing and monitoring aortic root dilation, assessing risk in conditions like Marfan syndrome, bicuspid aortic valve, and other connective tissue disorders. It helps guide decisions regarding surveillance frequency and surgical intervention.
Tips: Enter aortic root diameter in centimeters and body surface area in square meters. Both values must be positive numbers. ARD is typically measured at the sinuses of Valsalva by echocardiography or other imaging modalities.
Q1: What is the normal range for ARSI?
A: Normal ARSI values typically range from 1.5 to 2.1 cm/m² in adults, though reference values may vary by age, gender, and population.
Q2: Why index aortic root to body surface area?
A: Indexing to BSA accounts for differences in body size, allowing more accurate comparison of aortic dimensions between individuals and better identification of pathological dilation.
Q3: How is BSA calculated?
A: BSA is commonly calculated using formulas like Du Bois, Mosteller, or Haycock, based on height and weight measurements.
Q4: When is ARSI particularly important?
A: ARSI is especially valuable in pediatric cardiology, athletic screening, and monitoring patients with genetic syndromes predisposing to aortic pathology.
Q5: What ARSI values indicate concern?
A: Values above 2.1-2.4 cm/m² (depending on the reference) generally indicate aortic root dilation and warrant closer monitoring and specialist evaluation.