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A method for estimating aortic regurgitant effective orifice area by digital Doppler color flow mapping
1Laboratory of Animal Medicine and Surgery, National Heart, Lung and Blood Institute, National Institutes of Health, Bethesda, MD 20892, USA.
The Journal of Heart Valve Disease
|March 21, 1998
Summary
A new digital automated color Doppler method (ACM) combined with continuous wave (CW) Doppler accurately estimates aortic regurgitant effective orifice area (EOA). This non-invasive technique aids in evaluating the severity of aortic regurgitation (AR).
Area of Science:
- Cardiology
- Medical Imaging
- Echocardiography
Background:
- Non-invasive assessment of aortic regurgitation (AR) severity is clinically important but challenging.
- Current Doppler echocardiographic methods often rely on semi-quantitative angiographic grading.
- Digital color Doppler methods show promise for calculating cardiac output and stroke volume.
Purpose of the Study:
- To develop and validate a digital automated color Doppler method (ACM) for assessing AR severity.
- To estimate the aortic regurgitant effective orifice area (EOA) using ACM combined with continuous wave (CW) Doppler.
Main Methods:
- The study involved six sheep under 22 different hemodynamic conditions.
- Regurgitant volumes (RV) were measured using electromagnetic flowmetry (EM) and ACM.
- AR effective orifice areas (EOAs) were calculated by dividing RV by the time integral of AR velocities.
Main Results:
- ACM accurately quantified AR EOAs, showing a strong correlation (r = 0.96) with electromagnetic flowmetry.
- Calculated AR EOA correlated well with peak AR flow and regurgitant fraction determined by EM.
Conclusions:
- The combined ACM/CW Doppler method provides a reliable non-invasive estimation of aortic regurgitant EOA.
- This approach is valuable for evaluating the severity of aortic regurgitation in clinical settings.