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Related Experiment Videos

Evaluating isovelocity surface area flow convergence method with finite element modeling

C G DeGroff1, A M Baptista, D J Sahn

  • 1Cardiovascular Flow Dynamics Research Laboratory, University of Colorado Health Science Center, The Children's Hospital, Denver 80218, USA.

Journal of the American Society of Echocardiography : Official Publication of the American Society of Echocardiography
|August 27, 1998
PubMed
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The isovelocity surface area flow convergence method, used for estimating regurgitant valve flow rates, can overestimate results. However, Doppler color flow imaging helps correct this, making the method a viable alternative.

Area of Science:

  • Cardiovascular imaging
  • Biomedical engineering
  • Fluid dynamics

Background:

  • Three-dimensional color Doppler flow imaging has increased interest in the isovelocity surface area flow convergence method.
  • This method is used for estimating regurgitant valve flow rates.

Purpose of the Study:

  • To investigate the isovelocity surface area flow convergence method for estimating regurgitant valve flow rates.
  • To identify inaccuracies inherent in the flow convergence method.

Main Methods:

  • Numerical experimentation using depth-averaged finite element models of the left heart.
  • Models ranged from synthetic representations to patient-specific echocardiographic data of a prolapsed mitral valve.

Main Results:

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  • The isovelocity surface area flow convergence method consistently overestimated regurgitant flow rates across considered Nyquist limits.
  • A critical Nyquist limit was identified where this overestimation was minimized.
  • The angle dependence of Doppler color flow imaging partially corrects for the overestimation.

Conclusions:

  • The isovelocity surface area flow convergence method is a viable alternative to current methods for estimating regurgitant valve flow rates.
  • Numerical experimentation has illuminated inaccuracies within the flow convergence method, particularly concerning overestimation.