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Evaluation of Left Ventricular Structure and Function using 3D Echocardiography
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Quantifying left ventricular trabeculae function - application of image-based fractal analysis.

Brandon Moore1, Lakshmi Prasad Dasi

  • 1Department of Mechanical Engineering, Colorado State University Fort Collins, Colorado, 80523-1374.

Physiological Reports
|December 5, 2013
PubMed
Summary
This summary is machine-generated.

Ventricular trabeculae carneae (VTCs) actively contribute to heart function by providing mechanical leverage during ejection, as revealed by a novel fractal analysis of CT imaging. This study redefines the VTCs

Keywords:
CT imagingejectionfractaltrabeculae

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Area of Science:

  • Cardiovascular Imaging
  • Biomechanical Analysis
  • Cardiac Mechanics

Background:

  • The ventricular-blood interface is complex, featuring ventricular trabeculae carneae (VTCs).
  • The precise functional role of VTCs during the cardiac cycle remains incompletely understood.
  • Traditional views often consider VTCs as passive structures.

Purpose of the Study:

  • To introduce an image-based framework for quantifying VTC function.
  • To investigate the active role of VTCs during cardiac ejection using high-resolution imaging.
  • To offer new insights into the biomechanics of VTCs.

Main Methods:

  • Acquisition of high-resolution Cine CT scans at 10 phases of the cardiac cycle.
  • Segmentation of images and triangulation to obtain the VTC surface.
  • Calculation of VTC surface fractal dimension (D) using the box-counting algorithm over time.

Main Results:

  • Fractal dimension (D) of VTCs varied significantly (P < 0.003) during the cardiac cycle, being highest at diastole and lowest at peak systole.
  • The D-V loop (fractal dimension vs. stroke volume) exhibited hysteresis, indicating active VTC function.
  • VTCs demonstrated mechanical leverage during early systolic ejection and relaxation during late diastole.

Conclusions:

  • A novel image-based framework quantifies VTC function through fractal dimension analysis.
  • Hysteresis in the D-V loop suggests VTCs play an active mechanical role, providing leverage during ejection.
  • This challenges the traditional view of VTCs as solely passive structures, highlighting their dynamic contribution to cardiac mechanics.