Speckle-Tracking Echocardiography for LV Myocardial Stiffness Estimation
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Solution Overview
Problem
Current echocardiographic methods are inadequate for directly measuring left ventricular myocardial stiffness, which is a critical factor in the progression of heart failure with preserved ejection fraction (HFpEF, leading to increased LV chamber stiffness and elevated filling pressures.
Innovation Solution
A novel protocol integrating speckle tracking echocardiography (STE) with myocardial strain and stress approximations to estimate LV myocardial stiffness, applicable as a post-processing complement to traditional echocardiographic studies, using algebraic calculations to quantify regional LV myocardial stiffness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional echocardiographic methods are used, then the assessment of heart structure and function is achieved, but the direct measurement of LV myocardial stiffness is not possible
Solution Approach 1:
The patent uses speckle tracking echocardiography as an intermediary technique to indirectly measure LV myocardial stiffness. By tracking acoustic markers (speckles) in the myocardium and calculating strain and stress parameters, the system derives stiffness without requiring direct measurement capabilities. This intermediary approach enables stiffness assessment using existing echocardiographic equipment and processing capabilities.
2Reliability
If strain-based assessment is used, then regional LV myocardial deformation is quantified, but the detection of increased LV myocardial stiffness is limited due to dependency on hemodynamic load and LV geometry
Solution Approach 1:
The patent transforms the assessment from purely strain-based parameters to include stress and stiffness parameters. By calculating stress using Laplace's law (incorporating pressure and geometry) and then deriving stiffness as the ratio of stress to strain, the method creates a new parameter that is less dependent on hemodynamic load variations and more specific to myocardial tissue properties, thereby improving HFpEF detection accuracy.
3Ease of manufacture
If simple algebraic calculations are used for stiffness estimation, then the method is easily integrated into conventional echocardiography workflow, but the measurement of complex myocardial mechanical properties is achieved
Solution Approach 1:
The patent replaces complex mechanical measurement systems with algebraic calculations. Instead of using sophisticated mechanical testing equipment or complex imaging sequences, the method uses standard echocardiographic images combined with mathematical formulas (Laplace's law for stress, and stiffness as stress/strain ratio) to estimate myocardial stiffness. This substitution maintains ease of implementation while achieving meaningful measurement of complex mechanical properties.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Provides a sensitive and translational method to assess LV myocardial stiffness, aiding in the evaluation of heart failure risk and guiding treatment protocols, with potential applications in other soft tissues like thoracic or abdominal aortic aneurysms.
Implementation Method 1
STE provides a non-invasive tool to quantify regional LV myocardial strain based on relative changes in a segment length, whereby segments are defined with respect to acoustic markers (speckles) that are contained within a prespecified myocardial region and tracked over the cardiac cycle
Data Source
AI summary
The disclosure deals with methodology and corresponding apparatus/system subject matter for image-based estimation of left ventricular myocardial stiffness. Increased left ventricular myocardial stiffness is a key factor in the development and progression of heart failure. Despite the potential impact on the clinical management of heart failure, there is currently a lack of available techniques to assess left ventricular myocardial stiffness. To address this limitation, a simple protocol is disclosed for processing routine echocardiographic imaging data to estimate left ventricular myocardial stiffness, with protocol specification for patients at risk for heart failure with preserved ejection fraction, for both sensitivity and translational feasibility of the obtained estimates of left ventricular myocardial stiffness.