A method for estimating aortic regurgitant effective orifice area by digital Doppler color flow mapping

Masahide Chikada, Takahiro Shiota, Satoshi Aida, Izumi Yamada, David J. Sahn, Michael Jones

Research output: Contribution to journalArticle

3 Scopus citations

Abstract

Background and aims of the study: Although noninvasive assessment of the severity of aortic regurgitation (AR) is important, quantitative evaluation of AR can be difficult in clinical settings. Most Doppler echocardiographic methods have been compared with angiographic grading of AR severity. However, while aortic angiography is used widely for grading AR severity, the method is only semi-quantitative. A computed semi-automatic digital color Doppler method has recently been described for calculating stroke volume and cardiac output. The study aim was to develop a method of evaluating AR severity by using a digital automated color Doppler method (ACM) along with continuous wave (CW) Doppler for estimating aortic regurgitant effective orifice area. Methods: A total of 22 different hemodynamic conditions were studied in six sheep. Regurgitant volumes (RV) were determined by electromagnetic flowmetry (EM) and by ACM. AR effective orifice areas (EOAs) were determined by dividing each of the RVs by the time integrals of the AR continuous wave velocities. AR EOAs by ACM were compared with those obtained by EM and with other EM indices of regurgitant severity. ACM was accurate for quantifying AR EOAs (r = 0.96). Results and conclusions: Calculated AR EOA correlated well with peak AR flow and regurgitant fraction by EM. The combined ACM/CW Doppler method can be useful for estimating non-invasively the aortic regurgitant EOA and for evaluating the severity of AR.

Original languageEnglish (US)
Pages (from-to)102-107
Number of pages6
JournalJournal of Heart Valve Disease
Volume7
Issue number1
StatePublished - Jan 1 1998

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine

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    Chikada, M., Shiota, T., Aida, S., Yamada, I., Sahn, D. J., & Jones, M. (1998). A method for estimating aortic regurgitant effective orifice area by digital Doppler color flow mapping. Journal of Heart Valve Disease, 7(1), 102-107.