Implantable System Dominant Frequency Analysis Tachycardia Treatment
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Solution Overview
Problem
Existing treatments for tachycardia, such as anti-tachycardia pacing, are often unguided and ineffective, leading to the need for painful defibrillation shocks that can cause myocardial damage, highlighting the need for improved characterization and treatment selection methods.
Innovation Solution
Implantable systems that use dominant frequency analysis of electrogram signals to determine whether to deliver anti-tachycardia pacing or a shock to terminate tachycardia, with thresholds for dominant frequency and variation guiding treatment decisions, and fractionation analysis to assess the complexity of cardiac electrical activity for treatment selection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If anti-tachycardia pacing is delivered on a trial and error basis, then treatment coverage is provided, but treatment effectiveness is low and unnecessary shocks may be delivered
Solution Approach 1:
The patent performs dominant frequency analysis on electrogram signals before delivering anti-tachycardia pacing to pre-characterize the tachycardia. This preliminary characterization using spectral analysis of EGM signals allows the system to determine tachycardia properties (such as dominant frequency and frequency distribution) in advance, enabling more informed treatment selection and reducing trial-and-error approaches.
Solution Approach 2:
The system uses real-time analysis of electrogram signals to continuously monitor tachycardia characteristics and adjusts treatment selection based on this feedback. The dominant frequency analysis provides ongoing information about the tachycardia's electrical properties, allowing the device to adapt treatment parameters dynamically rather than using fixed protocols.
2Reliability
If defibrillation shock is delivered to terminate tachycardia, then tachycardia termination is achieved, but myocardial damage occurs and patient experiences pain
Solution Approach 1:
The patent changes the treatment parameter selection based on the dominant frequency characteristics of the tachycardia. By analyzing the spectral content of electrogram signals and comparing dominant frequency against thresholds, the system selects between low-energy pacing therapy and high-energy shock therapy, thereby avoiding unnecessary myocardial damage from shock delivery when pacing would suffice.
Solution Approach 2:
The system performs preliminary dominant frequency analysis to characterize the tachycardia before delivering any therapy. This advance characterization allows the device to predict which treatment modality (pacing or shock) is more likely to be effective, reducing the likelihood of delivering harmful shocks when less invasive pacing therapy would achieve termination.
3Measurement precision
If dominant frequency analysis is performed to guide treatment selection, then treatment precision is improved, but computational requirements and device complexity increase
Solution Approach 1:
The patent extracts only the dominant frequency parameter from the full electrogram signal spectrum for treatment decision-making. Rather than performing complete spectral analysis or using all signal features, the system focuses on identifying and utilizing the dominant frequency component, simplifying the computational burden while maintaining clinically relevant characterization precision.
Solution Approach 2:
The system uses simplified algorithms and thresholds for dominant frequency analysis that can be implemented with limited computational resources. The approach employs basic spectral analysis methods and fixed threshold comparisons rather than complex machine learning models, making the sophisticated analysis feasible in implantable devices with constrained processing capabilities.
Data Source
AI summary
Provided herein are implantable systems, and methods for use therewith, for characterizing a tachycardia and/or selecting treatment for a tachycardia using results of a dominant frequency analysis. One or more electrogram (EGM) signal(s) indicative of cardiac electrical activity are obtained. For at least one of the EGM signal(s) a dominant frequency (DF) analysis is performed, and the results of the DF analysis are used to characterize a tachycardia and/or to select treatment for a tachycardia.