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© 2009 by the American Institute of Ultrasound in Medicine
J Ultrasound Med 28:563-569 • 0278-4297

Doppler Velocimetry of the Ophthalmic Artery in Normal Pregnancy

Reference Values

Cristiane Alves de Oliveira, MD, Renato Augusto Moreira de Sá, PhD, Luis Guillermo Coca Velarde, PhD, Edson Marchiori, PhD, Hermógenes Chaves Netto, PhD and Yves Ville, MD

Mestrado em Ciências Médicas, Universidade Federal Fluminense, Rio de Janeiro, Brazil (C.A.d.O., R.A.M.d.S., L.G.C.V., E.M.); Maternidade Escola, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil (H.C.N.); and Service de Gynecologie-Obstetrique, Centre Hospitalier Intercommunal de Poissy, St Germain en Laye, Poissy, France (Y.V.).

Address correspondence to Cristiane Alves de Oliveira, MD, Rua Silva Cardoso 874 (Bangu), 21815-072 Rio de Janeiro-RJ, Brazil., E-mail: crisalves_oliveira{at}yahoo.com.br

Objective. This study aimed at analyzing the correlation between ophthalmic Doppler indices and gestational age (GA) in healthy patients with singleton pregnancies. Intraobserver reproducibility and right-to-left eye correlation were also evaluated. Methods. Healthy pregnant women (n = 289) at 20 to 40 weeks’ GA were evaluated. The resistive index (RI), pulsatility index (PI), and peak ratio (PR) were determined by 2 measurements in each eye. Comparisons were performed first between the 2 measurements in each eye and later between the right and left eyes. Spearman rank correlation was used to analyze the relationship of the RI, PI, and PR with GA. Linear regression analysis was also performed. Results. No significant differences were found between the values obtained for the first and the second measurements in each eye and those for the RI, PI, and PR in the right and left eyes. There was a significant decrease in RI and PI values with advancing GA, however ({rho} = –0.264 and –0.1192, respectively), with low R2 values for both. Thus, only a small proportion of the variations observed in the RI and PI was associated with changes in GA. No significant difference was found between the PR values with regard to GA intervals. Conclusions. Doppler velocimetry is a reproducible technique for evaluation of the RI, PI, and PR in the ophthalmic artery. Unilateral analysis of these indices can be used. Linear regression analysis indicated that other factors were associated with a decrease in the RI and PI values with advancing GA. No significant change was observed in the PR values throughout normal pregnancy.

Key Words: Doppler sonography • ophthalmic artery • pregnancy • reference values • sonography

Abbreviations: GA, gestational age • PE, preeclampsia • PI, pulsatility index • PR, peak ratio • Q-Q, quantile-quantile • RI, resistive index

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Copyright © 2009 by the American Institute of Ultrasound in Medicine.