Aortic Root Index

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Data Acquisition

Aortic root

Reference Values

Normal Aortic Root Index (cm/m2)
Aortic RootMenWomen
Annulus1.3 ± 0.11.3 ± 0.1
Sinuses of Valsalva1.7 ± 0.21.8 ± 0.2
Sinotubular junction1.5  ± 0.21.5 ± 0.2
Proximal ascending aorta1.5 ± 0.21.6 ± 0.3


\[ARI = \frac{Ao \hspace{0.2cm} Root \hspace{0.2cm} diameter}{BSA}\]


ARIAortic root index
BSABody surface area using the Mosteller formula


1.Lang RM et al. Recommendations for cardiac chamber quantification by echocardiography in adults: an update from the American Society of Echocardiography and the European Association of Cardiovascular Imaging. J Am Soc Echocardiogr. 2015 Jan;28(1):1-39. Full text


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Developer & Illustrator: Sirikarn Napan, MD, FACC