Cardiac Rhythm Management Capture Verification Mode Selection
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Solution Overview
Problem
Current cardiac rhythm management systems face challenges in accurately determining the capture threshold for pacing pulses, leading to inefficient energy expenditure and potential discomfort for patients, as they struggle to reliably select the appropriate capture verification mode to adjust pacing energy effectively.
Innovation Solution
A method and system for selecting capture verification modes, including automatic beat-by-beat capture detection and capture threshold testing, are implemented using a cardiac rhythm management system with electrodes, a pulse generator, and processor circuitry to evaluate and select the most effective capture verification mode based on the patient's conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If capture threshold testing is performed without beat-by-beat detection, then device complexity is reduced, but measurement precision of capture threshold deteriorates
Solution Approach 1:
The system dynamically transitions between two capture verification modes: automatic capture detection mode for continuous monitoring and capture threshold testing mode for periodic threshold determination. The controller selects the appropriate mode based on operational requirements, allowing the system to adapt its complexity level and measurement precision dynamically rather than being fixed in one approach
Solution Approach 2:
The system performs capture threshold testing at periodic intervals using structured threshold search algorithms (such as binary search or stepwise reduction methods) rather than continuous monitoring. This periodic approach reduces overall device complexity and power consumption while maintaining adequate measurement precision through scheduled verification events
2Reliability
If pace pulse energy is increased to ensure capture, then reliability of capture is improved, but energy consumption increases
Solution Approach 1:
The system uses automatic capture detection to continuously monitor whether each paced beat produces the desired cardiac response. When capture is detected, the system receives feedback confirmation and can maintain or reduce pacing energy. When capture is not detected, the system increases energy delivery to ensure reliable capture, creating a closed-loop feedback control system that optimizes energy usage based on actual capture outcomes
Solution Approach 2:
The system dynamically adjusts pacing pulse parameters (amplitude, width, or both) based on detected capture status and determined threshold values. By changing these parameters in response to measured conditions rather than maintaining fixed high-energy delivery, the system achieves reliable capture while minimizing overall energy consumption through parameter optimization
3Measurement precision
If beat-by-beat capture detection is implemented, then measurement precision of capture status is improved, but device complexity increases
Solution Approach 1:
The system dynamically transitions between two capture verification modes: automatic capture detection mode for continuous monitoring and capture threshold testing mode for periodic threshold determination. The controller selects the appropriate mode based on operational requirements, allowing the system to adapt its complexity level and measurement precision dynamically rather than being fixed in one approach
Solution Approach 2:
The same sensing electrodes and signal processing circuitry are used for multiple functions: detecting evoked responses for capture verification, measuring pacing artifacts for threshold determination, and monitoring cardiac electrical activity. This multi-functional use of existing components achieves high measurement precision without proportionally increasing device complexity
Data Source
AI summary
Methods and systems are directed to selecting from a variety of capture verification modes. A plurality of capture verification modes, including a beat by beat capture detection mode and a capture threshold testing mode without intervening beat by beat capture detection is provided. An efficacy of at least one of the capture verification modes is evaluated and, based on the evaluation, a capture verification mode is selected.