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Quantifying Myocardial Contractility Changes Using Ultrasound-Based Shear Wave Elastography.

Maryam Vejdani-Jahromi1, Jenna Freedman1, Matthew Nagle1

  • 1Biomedical Engineering Department, Duke University, Durham, North Carolina.

Journal of the American Society of Echocardiography : Official Publication of the American Society of Echocardiography
|November 16, 2016
PubMed
Summary
This summary is machine-generated.

Shear wave elasticity imaging (SWEI) can quantify myocardial contractility changes in isolated rabbit hearts. This ultrasound technique shows potential for noninvasive assessment of cardiac function, even when the Gregg effect is blocked.

Keywords:
ContractilityElastographyGregg effectShear wave elasticity imaging (SWEI)Tissue characterizationUltrasound imaging

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Area of Science:

  • Cardiovascular Physiology
  • Biomedical Ultrasound
  • Medical Imaging

Background:

  • Myocardial contractility is crucial for assessing cardiac function and guiding treatment in cardiovascular diseases like heart failure.
  • Shear wave elasticity imaging (SWEI) is an emerging ultrasound technique for evaluating cardiac tissue stiffness.
  • Quantifying myocardial contractility is essential for clinical management of heart conditions.

Purpose of the Study:

  • To validate the capability of Shear wave elasticity imaging (SWEI) to measure changes in myocardial contractility.
  • To assess the relationship between systolic stiffness and coronary perfusion pressure using SWEI.
  • To investigate the effect of blocking the Gregg effect on SWEI measurements of contractility.

Main Methods:

  • SWEI was used to measure systolic stiffness in 12 isolated rabbit hearts across varying coronary perfusion pressures (0-92 mm Hg).
  • Cardiac contractility was modulated using the Gregg effect, which links contractility to coronary perfusion.
  • Gadolinium was administered to four hearts to block the Gregg effect and re-evaluate SWEI measurements.

Main Results:

  • Systolic stiffness measured by SWEI demonstrated a linear correlation with coronary perfusion pressure (R² = 0.73).
  • The slope of this relationship was 0.27 kPa/mm Hg, indicating direct measurement of contractility.
  • Gadolinium administration significantly reduced the slope to 0.08 kPa/mm Hg, confirming the Gregg effect's influence and SWEI's ability to detect it.

Conclusions:

  • SWEI-derived systolic stiffness serves as a reliable index of contractility in unloaded, isolated rabbit hearts.
  • The study supports the potential of SWEI as a direct, noninvasive method for assessing cardiac contractility.
  • Further research under more physiological conditions may enhance the clinical applicability of this ultrasound technique.