Capture Detection with Contralateral Backup Pacing
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Solution Overview
Problem
Current cardiac rhythm management devices face challenges in accurately determining capture threshold for pacing, leading to inefficient energy use and potential discomfort, as high energy backup pacing shortens battery life and interferes with signal detection.
Innovation Solution
The method involves delivering a pacing pulse to a first heart chamber, sensing the cardiac response, and classifying it based on signal features, with a backup pacing pulse delivered to a contralateral chamber timed relative to the classified response, thereby maintaining pacing support without increasing energy beyond the capture threshold and minimizing interference with signal detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high energy backup pacing is delivered to ensure capture, then pacing support is maintained, but battery life is shortened and interference with signal detection increases
Solution Approach 1:
The backup pacing pulse energy is adjusted to match the capture threshold rather than using fixed high energy, optimizing energy consumption while ensuring capture. The timing of the backup pulse is dynamically adjusted based on detected cardiac signal features, resolving the contradiction between reliable pacing support and energy efficiency
Solution Approach 2:
The system dynamically adjusts the timing of backup pacing delivery based on detected cardiac signal features such as evoked response timing. This dynamic timing adjustment ensures pacing support is provided when needed while minimizing interference with capture detection signals, thereby extending battery life without compromising reliability
2Reliability
If high energy backup pacing is delivered to ensure capture, then pacing support is maintained, but interference with signal detection increases
Solution Approach 1:
The timing of backup pacing is dynamically adjusted based on detected cardiac signal features. The system detects features such as evoked responses and timing intervals, then schedules backup pacing to occur after these features are detected, eliminating interference with signal detection while maintaining pacing support
Solution Approach 2:
The system uses feedback from detected cardiac signal features to determine when to deliver backup pacing. By monitoring evoked responses and timing intervals, the system intelligently schedules backup pulses to avoid interfering with capture detection, thereby preventing loss of diagnostic information while ensuring pacing support
3Reliability
If pace pulse energy is increased above capture threshold, then capture reliability is improved, but patient discomfort increases and energy consumption rises
Solution Approach 1:
The system determines and maintains pace pulse energy at the capture threshold rather than using excessive energy levels. By accurately detecting capture threshold and adjusting pulse energy to match this parameter, the system ensures reliable capture while minimizing patient discomfort and energy consumption
Data Source
AI summary
In connection with capture detection for a heart chamber with backup pacing in a contralateral heart chamber, a cardiac signal of the first heart chamber is sensed following delivery of a pacing pulse. The cardiac response of the first heart chamber to the pacing pulse is classified based on one or more features of the sensed cardiac signal. A backup pacing pulse is delivered to a second heart chamber contralateral to the first heart chamber. For example, the timing of the delivery of the backup pacing pulse may be based on the expected or detected timing of the features used to classify the cardiac pacing response. The backup pace may be delivered within a detection window used for sensing the features indicative of the cardiac pacing response.