CRT Optimization via Evoked Response Electrogram Morphology
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Solution Overview
Problem
Current cardiac resynchronization therapy (CRT) methods struggle to optimize AV and VV delay intervals for delivering effective pacing in patients with heart failure, leading to inefficient ventricular contractions and compromised cardiac output due to unsynchronized atrial and ventricular activations.
Innovation Solution
The method involves recording evoked response electrograms during cardiac cycles to determine the optimal AV and VV delay intervals by incrementing or decrementing these intervals until a fusion beat is achieved, where paced and intrinsic activations coincide, thereby enhancing cardiac synchronization and output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional CRT pacing with fixed AV and VV delay intervals is used, then the device structure remains simple, but cardiac synchronization and pumping efficiency deteriorate due to inability to optimize timing parameters
Solution Approach 1:
The system automatically determines optimal AV and VV delay intervals by recording evoked response electrograms and analyzing fusion beat morphology, eliminating the need for manual clinician programming and achieving personalized optimization without increasing operational complexity
Solution Approach 2:
The system uses evoked response electrogram morphology as feedback to iteratively adjust and identify optimal pacing intervals, where the morphology changes provide real-time information about the effectiveness of different AV and VV delay settings
2Measurement precision
If manual optimization of AV and VV delay intervals is performed, then measurement precision can be maintained, but the procedure becomes time-consuming and complex
Solution Approach 1:
The device automatically performs the optimization procedure by systematically varying AV and VV delays and using algorithmic analysis of evoked response morphology to identify fusion beats, eliminating time-consuming manual adjustment while maintaining precision through objective morphological criteria
Solution Approach 2:
The system pre-programs a systematic search algorithm that automatically tests multiple AV and VV delay combinations and identifies optimal settings through evoked response analysis, preparing the optimization pathway in advance without requiring real-time manual intervention
3Ease of operation
If fixed pacing intervals are used in CRT, then device operation remains simple, but cardiac synchrony deteriorates due to patient-specific conduction variations
Solution Approach 1:
The system dynamically determines patient-specific AV and VV delay intervals based on individual conduction properties revealed by evoked response morphology, changing the pacing parameters from fixed universal values to customized values that match each patient's physiological characteristics
Solution Approach 2:
The optimization process separately determines optimal AV delay and optimal VV delay through distinct morphological analyses of evoked responses, breaking down the complex timing optimization into manageable segments that can be independently optimized and then combined
Data Source
AI summary
A method and system for determining an optimum atrioventricular delay (AVD) interval and/or ventriculo-ventricular delay (VVD) intervals for delivering ventricular resynchronization pacing in an atrial tracking or atrial sequential pacing mode. Evoked response electrograms recorded at different AVD and VVD intervals are used to determine the extent of paced and intrinsic activation.