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Related Experiment Videos

Stroke volume in-vivo using multiple 2D echo views from one echo window.

J C Buckey1, F M Sweeney, L T Kim

  • 1University of Texas Health Science Center, Southwestern Medical School, Dallas, USA.

Computers in Cardiology
|January 1, 1985
PubMed
Summary
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This study introduces a novel mathematical method for echocardiographic volume calculation, validated in-vivo. The new approach accurately measures ventricular stroke volume (SV) without geometric assumptions, offering improved clinical utility.

Area of Science:

  • Cardiology
  • Medical Imaging
  • Physiology

Background:

  • Accurate ventricular volume calculation is crucial for diagnosing and managing cardiovascular diseases.
  • Traditional echocardiographic methods rely on geometric assumptions that can limit accuracy.
  • A novel, non-geometric approach to echocardiographic volume calculation was developed.

Purpose of the Study:

  • To validate a new mathematical method for echocardiographic volume calculation in-vivo.
  • To compare stroke volume (SV) measurements obtained by the new echocardiographic method with those from the acetylene rebreathing technique.

Main Methods:

  • Echocardiographic views were acquired from a single point with transducer tilting, requiring angle measurement.
  • A novel tilt frame was designed for in-vivo use without compromising image quality.

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  • The method was tested in normal subjects under varying physiological conditions (lower body negative pressure, isoproterenol infusion).

    • Main Results:

    • The regression analysis showed a strong correlation between echocardiographic stroke volume (Echo SV) and acetylene rebreathing stroke volume (Acet SV): Echo SV = -19.7 + 1.2*Acet SV.
    • The coefficient of determination (R) was 0.80, with a Standard Error of Estimate (SEE) of 17.1 and a Mean Percentage Error (MPE) of 17%.

    Conclusions:

    • The validated mathematical approach provides an accurate, non-geometric method for ventricular volume calculation.
    • This novel technique offers a promising advancement in echocardiographic assessment of cardiac function.
    • The method's accuracy supports its potential for routine clinical application.