EchoBridgeMD Pearl 3: Aortic Root Dilation in Suspected Type A Aortic Dissection

In the proper clinical setting, a dilated aortic root should raise suspicion for potentially life-threatening conditions such as acute type A aortic dissection.

In the parasternal long-axis view, the normal aortic root is typically similar in diameter to both the left atrium and the right ventricle.

An aortic root measuring > 4 cm by echocardiography is generally considered enlarged and serves as a practical screening threshold in the emergency setting. Although indexing to body surface area provides a more individualized assessment, the 4-cm cutoff is a rapid bedside screening value, and echocardiographic measurements correlate well with CT angiography and cardiac MRI.

References:

📖 Alerhand S, Qiu L, Adrian RJ. What Echocardiographic Findings Suggest Acute Type A Aortic Dissection? J Emerg Med. 2025.

https://pubmed.ncbi.nlm.nih.gov/41313851/

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