Repolarization Mapping from Electrogram Data
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Solution Overview
Problem
Current cardiac mapping techniques primarily focus on depolarization and wavefront mapping, neglecting repolarization, which is crucial for identifying arrhythmogenic substrates and targeting specific ion channels, leading to inadequate treatment of arrhythmias, particularly in conditions like Brugada syndrome and long QT syndrome.
Innovation Solution
A method and system for determining repolarization values from Electrogram (EGM) data using an electrode array, involving preprocessing steps like high-pass filtering, baseline correction, and noise reduction to obtain orthogonal bipolar compound electrograms, allowing for the creation of repolarization maps that guide cardiac procedures such as catheter ablation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If depolarization and wavefront mapping is used, then activation timing can be determined, but repolarization abnormalities cannot be detected
Solution Approach 1:
The patent extracts repolarization information from EGM signals by separating it from the traditional depolarization-focused analysis. This is achieved through signal processing techniques that isolate the repolarization component (T-wave) from the composite EGM signal, allowing independent analysis of repolarization characteristics without being confounded by depolarization artifacts.
Solution Approach 2:
The patent inverts the traditional mapping approach by focusing on repolarization rather than depolarization. Instead of using activation timing as the primary metric, the system uses repolarization timing and heterogeneity as the basis for identifying arrhythmogenic substrates, particularly in conditions like Brugada syndrome and long QT syndrome where repolarization abnormalities are key pathophysiological features.
2Adaptability or versatility
If global therapeutic effects are used, then broad coverage is achieved, but specific ion channel targeting is not possible
Solution Approach 1:
The patent applies local quality by identifying specific regions with abnormal repolarization characteristics and targeting those localized areas for intervention. The system maps repolarization heterogeneity to identify discrete arrhythmogenic substrates, enabling focal rather than global treatment strategies. This allows for region-specific therapy that addresses only the problematic areas with abnormal repolarization, sparing healthy tissue from unwanted effects.
3Measurement precision
If depolarization mapping is used, then wavefront propagation can be visualized, but repolarization heterogeneity remains undetected
Solution Approach 1:
The patent makes the mapping system multi-functional by enabling it to perform both traditional depolarization mapping and novel repolarization mapping using the same EGM recording infrastructure. The system processes EGM signals to extract both activation timing (depolarization) and repolarization timing information, allowing dual functionality without requiring separate recording systems. This universality reduces overall system complexity while expanding diagnostic capabilities.
Data Source
AI summary
Various embodiments are described herein for a method for determining at least one repolarization value from Electrogram (EGM) data obtained from a heart using an electrode array, wherein the method comprises: obtaining bipolar EGM data from the EGM data obtained from the heart; determining at least one compound electrogram from the bipolar EGM data; and determining the at least one repolarization value from the at least one compound electrogram.