Aortic Root Index Calculator

Aortic Root Index (ARIndex) measures the aortic root size relative to patient height. It's used to assess aortic dilation and risk for aortic dissection, especially in Marfan syndrome and Ehlers-Danlos syndrome patients.

Input Parameters

Calculation Results

Aortic Root Index (ARIndex)

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Classification

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Calculation Formula

ARIndex = (Aortic Root Diameter / Patient Height) × 100

Where:
- ARIndex: Aortic Root Index (percentage)
- Aortic Root Diameter: Maximum diameter of the aortic root (typically measured at the sinotubular junction)
- Patient Height: Height of the patient in centimeters

Normal Values

ARIndex typically ranges from 25% to 35%

Values > 35% may indicate aortic dilation
Values > 45% are considered high risk for aortic dissection

Aortic Root Index Calculator Usage Guide

Learn how to use the Aortic Root Index Calculator and understand its clinical significance

How to Use This Calculator

  1. Enter the patient's height in centimeters (cm).
  2. Enter the aortic root diameter in centimeters (cm). This is typically measured at the sinotubular junction on echocardiography.
  3. Enter the patient's age in years.
  4. Click the "Calculate" button to compute the Aortic Root Index and classification.

Clinical Significance

The Aortic Root Index (AR Index) is a non-invasive measurement used to assess aortic size relative to body size. It helps in:

  • Screening for aortic dilation in patients with connective tissue disorders like Marfan syndrome and Ehlers-Danlos syndrome
  • Monitoring aortic dimensions over time
  • Assessing risk for aortic dissection and aneurysm formation

Interpreting Results

Classification is based on both the AR Index value and patient age:

  • Normal: AR Index ≤ 35% for adults, ≤ 32% for children under 18
  • Elevated: 35% < AR Index ≤ 45% for adults, 32% < AR Index ≤ 40% for children
  • Abnormal/High Risk: AR Index > 45% for adults, > 40% for children

Important Notes

The AR Index should be interpreted in the context of other clinical findings. It is not a standalone diagnostic tool but rather a screening and monitoring method. Always consult with a qualified healthcare professional for diagnosis and treatment decisions.