Noninvasive LVEF Estimation via 3D ECG Signal Analysis
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Solution Overview
Problem
Current methods for estimating Left Ventricular Ejection Fraction (LVEF) are costly, invasive, and have limited access, with existing ECG-based algorithms failing to provide reliable and noninvasive solutions, often showing poor correlation with gold standard techniques like CMR and RNA.
Innovation Solution
A noninvasive ECG method analyzing high-resolution 3D orthogonal (X,Y,Z) ECG data to estimate cardiac chamber size and mechanical function using mathematical analysis of dynamical and geometrical properties, incorporating metrics like QRST integral, 3D ECG volume integral, and spatial gradients, with adjustments for clinical data to estimate LVEF.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If gold standard techniques (CMR, RNA) are used to measure LVEF, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent replaces complex mechanical imaging systems (CMR, RNA) with an electrical signal processing system. Instead of using magnetic resonance or radionuclide imaging to measure cardiac function, the invention uses ECG signals processed through mathematical algorithms (vectorcardiography, loop analysis, integral calculations) to estimate LVEF, thereby substituting a mechanical/physical imaging system with an electrical signal processing system that is less complex and more accessible
Solution Approach 2:
The patent creates a mathematical model that copies the functional relationship between ECG signals and cardiac mechanical function. By developing algorithms that replicate the information content of gold standard imaging through electrical signal analysis alone, the invention provides a simplified copy of the measurement capability without requiring complex imaging equipment
2Measurement precision
If radionuclide angiography is used to measure LVEF, then measurement precision is improved, but harmful factors (radiation exposure) increase
Solution Approach 1:
The patent replaces radionuclide angiography (a nuclear medicine technique involving radiation) with pure electrical signal processing. The invention uses ECG-derived vectorcardiographic parameters and mathematical algorithms to estimate LVEF, completely eliminating the need for radionuclide tracers and associated radiation exposure while maintaining measurement capability
Solution Approach 2:
The patent converts the potentially harmful radionuclide-based measurement approach into a beneficial radiation-free alternative. By leveraging the information already present in standard ECG signals through advanced mathematical analysis, the invention transforms a harmful imaging modality into a safe, non-invasive electrical measurement system
3Reliability
If comprehensive 3D ECG analysis is performed to estimate LVEF, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent segments the complex 3D ECG analysis into distinct computational components: orthogonal lead derivation, vectorcardiographic loop formation, integral calculations (QRS, ST, QRST), and LVEF estimation algorithms. By breaking down the comprehensive analysis into modular mathematical steps, the invention manages complexity while maintaining reliability through systematic processing of each physiological parameter
Data Source
AI summary
The present disclosure generally relates to systems and methods and systems of a noninvasive technique for characterizing cardiac chamber size and cardiac mechanical function. A mathematical analysis of three-dimensional (3D) high resolution data may be used to estimate chamber size and cardiac mechanical function. For example, high-resolution mammalian signals are analyzed across multiple leads, as 3D orthogonal (X,Y,Z), or 10-channel data, for 30 to 800 seconds, to derive estimates of cardiac chamber size and cardiac mechanical function. Multiple mathematical approaches may be used to analyze the dynamical and geometrical properties of the data.