T-Wave Loop Analysis for Faster Cardiac Risk Detection
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Solution Overview
Problem
Existing medical devices struggle to accurately determine changes in cardiac repolarization to assess the risk of cardiac events such as arrhythmia or sudden cardiac death, requiring multiple cardiac electrical signals and significant processing time.
Innovation Solution
A medical device with processing circuitry that derives T-wave loops from one or two cardiac electrical signals in two or three dimensions to determine repolarization measurements, quantifies changes over time, and transmits risk notifications when a threshold is met.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple cardiac electrical signals are used to determine repolarization changes, then measurement precision is improved, but device complexity and processing time increase
Solution Approach 1:
The patent applies dimensionality change by deriving T-wave loops in two or three dimensions from one or two cardiac electrical signals. Instead of requiring multiple signals, the system creates a dimensional representation (T-wave loop with coordinates in 2D or 3D space) that captures repolarization information, thereby reducing the number of required signals while maintaining measurement precision through spatial dimensionality.
Solution Approach 2:
The system changes parameters by determining a T-wave vector representative of the T-wave loop and calculating a metric of changes between successive T-wave vectors. This parameter transformation from raw multiple signals to derived vector metrics enables accurate repolarization assessment using fewer input signals, resolving the contradiction between precision and complexity.
2Reliability
If multiple cardiac electrical signals are processed to assess cardiac event risk, then reliability is improved, but processing time increases
Solution Approach 1:
The patent extracts the essential repolarization information by deriving T-wave loops and determining representative T-wave vectors from one or two cardiac electrical signals. This extraction process isolates the critical features needed for risk assessment, eliminating the need to process multiple full signals and thereby reducing processing time while maintaining reliability through focused analysis of key repolarization parameters.
Solution Approach 2:
By transforming multiple cardiac signals into derived parameters (T-wave loop coordinates, T-wave vector components, and change metrics), the system reduces computational complexity. The parameter transformation enables efficient calculation of repolarization changes, improving processing speed while preserving the reliability needed for accurate cardiac event risk prediction.
3Measurement precision
If T-wave loops are derived in three dimensions, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent implements 3D T-wave loop derivation by extending the coordinate system to three dimensions, allowing more precise characterization of repolarization patterns. The processing circuitry determines three coordinates for each point on the T-wave loop, creating a comprehensive spatial representation that enhances measurement precision. This dimensional approach captures complex repolarization morphology that 2D representations cannot fully describe.
Solution Approach 2:
The system manages 3D processing complexity by determining T-wave vectors representative of the 3D T-wave loops and calculating metrics based on changes between successive vectors. This parameter reduction from full 3D loop data to representative vector metrics maintains measurement precision while optimizing processing efficiency, balancing the trade-off between precision and device complexity.
Data Source
AI summary
A medical device is configured to receive up to two cardiac electrical signals. For each cardiac cycle of multiple cardiac cycles, the device may derive a T-wave loop in at least two dimensions using one or two of the up to two cardiac electrical signals. The medical device may determine a repolarization measurement representative of each T-wave loop and determine a change in the repolarization measurement from a previously determined repolarization measurement. The device may determine a metric of the determined changes in the repolarization measurements.