Cardiac Conduction System Capture Detection via A-V Delay Adjustment
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Solution Overview
Problem
Current systems for determining cardiac conduction system capture during ventricle from atrium (VfA) pacing therapy face challenges in distinguishing between capturing the cardiac conduction system and other cardiac tissue, particularly in cases of A-V block, where existing methods may not accurately assess the effectiveness of pacing electrode placement and therapy delivery.
Innovation Solution
The described systems and methods utilize both invasive and non-invasive approaches, including external electrodes on the skin and implantable electrodes, to monitor cardiac signals and determine cardiac conduction system capture by adjusting A-V delays and analyzing electrical activity, such as electrograms and electrocardiograms, to assess dyssynchrony and ensure capture of the cardiac conduction system rather than other cardiac tissue.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If invasive implantable electrodes are used to monitor cardiac signals, then measurement precision of cardiac conduction system capture is improved, but device complexity and invasiveness increase
Solution Approach 1:
The system divides cardiac signal monitoring into multiple independent electrode components (atrial electrodes, ventricular electrodes, and conduction system electrodes) that can be selectively deployed. Each electrode type targets specific cardiac regions, allowing precise capture determination without requiring a single complex invasive device.
Solution Approach 2:
The patent introduces intermediate processing components including signal amplifiers, filters, and analyzers that mediate between the raw cardiac signals and the final capture determination. These intermediaries enhance measurement precision by conditioning signals before analysis, reducing the need for overly complex electrode designs.
2Measurement precision
If multiple A-V delay adjustments are performed to determine capture, then measurement precision of conduction system capture is improved, but loss of time increases
Solution Approach 1:
The system performs preliminary measurements using non-invasive external electrodes to establish baseline cardiac parameters and predict optimal A-V delay ranges before committing to invasive electrode implantation. This preliminary characterization reduces the number of iterative adjustments needed during definitive capture determination.
Solution Approach 2:
The system implements real-time feedback mechanisms where each A-V delay adjustment immediately provides measurement results that inform the next adjustment. The feedback loop includes automated analysis of electrogram morphology and timing, allowing rapid convergence on the optimal A-V delay without requiring manual trial-and-error by clinicians.
3Ease of operation
If non-invasive external electrodes are used, then ease of operation is improved, but measurement precision of cardiac conduction system capture deteriorates
Solution Approach 1:
The system merges multiple measurement modalities by combining signals from both non-invasive external electrodes and invasive implantable electrodes. This hybrid approach maintains ease of initial application while achieving high measurement precision through signal integration and comparative analysis.
Solution Approach 2:
The electrode apparatus is designed with multi-functionality, where the same external electrode array can serve both as a preliminary screening tool and as a component of the definitive measurement system. The system adapts its measurement strategy based on the electrode configuration available, maintaining precision across different operational modes.
Data Source
AI summary
Systems, methods, and devices are described herein for determining cardiac conduction system capture of ventricle from atrium (VfA) therapy. VfA therapy may be delivered at a plurality of different A-V delays while electrical activity of the patient is monitored. The electrical activity may then be utilized to determine whether the cardiac conduction system of the patient has been captured by the VfA therapy.