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Related Experiment Videos

Effect of left ventricular shape alteration on contractility and function.

L Zhong1, D N Ghista, E Y K Ng

  • 1School of Mechanical and Production Engineering, College of Engineering, Nanyang Technological University, Nanyang Avenue, Republic of Singapore.

Journal of Medical Engineering & Technology
|June 15, 2007
PubMed
Summary
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Left ventricular (LV) shape significantly impacts contractility and ejection function. A more spherical LV shape, deviating from optimal ellipticity, is linked to reduced contractility and poorer systolic function, often seen in heart failure.

Area of Science:

  • Cardiology
  • Biomedical Engineering
  • Physiology

Background:

  • Left ventricular (LV) shape is a critical determinant of cardiac function.
  • Assessing LV contractility and ejection function is vital for diagnosing and managing heart conditions.
  • Existing methods may not fully capture the influence of LV geometry on myocardial performance.

Purpose of the Study:

  • To investigate the effect of left ventricular (LV) shape on contractility and ejection function.
  • To develop novel contractility indices that incorporate LV geometry.
  • To evaluate LV contractility based on the deviation of its shape from an optimal ellipsoidal form.

Main Methods:

  • Development of a new contractility index (CONT1) based on wall stress rate (dsigma*/dt) and LV ellipsoidal model (LVEM) shape factor.

Related Experiment Videos

  • Creation of a second contractility index (CONT2) derived from optimal LV shape parameters (B/A ratio).
  • Utilizing cine-ventriculography data to derive LV major (B) and minor (A) axes throughout the cardiac cycle.

    • Main Results:

    • A novel contractility index (CONT1) was derived, incorporating LV ellipsoidal shape.
    • A second index (CONT2) was developed by optimizing the B/A shape parameter.
    • Results indicate that non-optimal, less-ellipsoidal (more spherical) LV shapes are associated with decreased contractility and poor systolic function.

    Conclusions:

    • LV geometry plays a crucial role in modulating myocardial contractility and overall systolic function.
    • Deviations from an optimal ellipsoidal LV shape correlate with diminished cardiac performance.
    • The developed contractility indices offer a new approach to evaluate LV function, particularly in the context of heart failure.