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Assessment of Diastolic Function Using Ultrasound Elastography.
Maryam Vejdani-Jahromi1, Jenna Freedman1, Young-Joong Kim1
1Biomedical Engineering Department, Duke University, Durham, NC, USA.
Ultrasound in Medicine & Biology
|January 15, 2018
Summary
Shear wave elasticity imaging (SWEI) effectively assesses myocardial end-diastolic stiffness and relaxation time constant (τ). This novel ultrasound technique correlates closely with traditional pressure-volume measurements for evaluating diastolic function.
Area of Science:
- Cardiovascular Physiology
- Biomedical Imaging
- Medical Ultrasound
Background:
- Shear wave elasticity imaging (SWEI) is an emerging ultrasound elastography method.
- Assessing cardiac diastolic function is crucial for diagnosing heart conditions.
- Traditional methods like pressure-volume loops can be invasive.
Purpose of the Study:
- To evaluate the potential of SWEI for diastolic functional assessment.
- To compare SWEI-derived diastolic stiffness and relaxation parameters with pressure-volume measurements.
- To investigate SWEI's utility in global ischemia conditions.
Main Methods:
- Simultaneous pressure-volume (PV) and SWEI recordings were performed on isolated rabbit hearts.
- Measurements were taken before and after inducing global ischemia.
- Analysis focused on end-diastolic stiffness and relaxation time constant (τ).
Main Results:
- SWEI stiffness increased by 103% post-ischemia, mirroring a 100% increase in PV-based stiffness (p<0.05).
- SWEI-derived relaxation time constant (τ) showed a 76% increase post-ischemia (p<0.05).
- A strong linear correlation (R²=0.80) was observed between SWEI-based and PV-derived τ values.
Conclusions:
- SWEI can accurately derive myocardial end-diastolic stiffness and relaxation time constant (τ).
- SWEI measurements demonstrate consistency with PV measurements for diastolic function assessment.
- SWEI shows promise as a non-invasive tool for evaluating diastolic heart function.
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