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Related Experiment Video

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In Vivo Quantitative Assessment of Myocardial Structure, Function, Perfusion and Viability Using Cardiac Micro-computed Tomography
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Quantifying "normalized" regional left ventricular contractile function in ischemic coronary artery disease.

Matthew C Henn1, Brian P Cupps1, Julia Kar1

  • 1Division of Cardiothoracic Surgery, Department of Surgery, Washington University School of Medicine, St Louis, Mo.

The Journal of Thoracic and Cardiovascular Surgery
|May 6, 2015
PubMed
Summary

A new z-score normalization method accurately identifies regional left ventricular (LV) contractile dysfunction in coronary artery disease (CAD) patients. This quantitative approach improves localization of wall motion abnormalities for better treatment decisions.

Keywords:
MRIcontractilitycoronary artery disease

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Area of Science:

  • Cardiology
  • Medical Imaging
  • Biomedical Engineering

Background:

  • Regional left ventricular (LV) contractile function is crucial for revascularization decisions in coronary artery disease (CAD).
  • Current methods for assessing LV function are often subjective and nonquantitative.
  • Improved objective metrics are needed to guide therapeutic interventions.

Purpose of the Study:

  • To develop and test a z-score normalization method for quantifying regional LV contractile function.
  • To create high-resolution, 3D LV maps of normalized strain data.
  • To assess the accuracy of this novel method in patients with CAD.

Main Methods:

  • Cardiac MRI was used to acquire high-resolution LV geometric datasets from 120 subjects (60 healthy, 60 CAD patients).
  • Multiple 3D strain parameters were calculated from tissue tag-plane displacement data.
  • A normal human strain database was created from healthy volunteers for z-score normalization and comparison with CAD patient data.

Main Results:

  • The z-score normalization method accurately localized contractile abnormalities, showing high concordance with gold-standard criteria (e.g., 97% for SPECT, 95% for echocardiography).
  • Significant regional contractile abnormalities were identified in 55% of CAD patients.
  • Consistency among traditional gold-standard metrics was limited (19%).

Conclusions:

  • Nonsubjective z-score normalization of regional LV contractile function provides quantitative, high-resolution localization of wall motion abnormalities in CAD patients.
  • This advanced imaging technique may enhance the accuracy of therapeutic interventions for CAD.
  • The method offers a more objective and precise assessment of regional myocardial function.