Multi-chamber Pacing Capture Detection via Evoked Response Windows
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Solution Overview
Problem
Current cardiac devices face challenges in accurately determining capture thresholds for multi-chamber pacing, leading to inefficient energy management and potential discomfort for patients, as they struggle to differentiate between capture responses in multiple heart chambers.
Innovation Solution
The method involves delivering pacing pulses to left and right heart chambers and sensing cardiac electrogram signals to distinguish between left chamber capture, right chamber capture, and bi-chamber capture using detection windows associated with expected features of the cardiac signal, allowing for enhanced capture threshold testing and automatic verification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pace pulse energy is increased to ensure reliable capture, then capture reliability is improved, but energy consumption increases and battery life decreases
Solution Approach 1:
The system senses the evoked response signal following each pace pulse and uses this feedback to determine whether capture occurred. Based on the detected capture status, the pacemaker dynamically adjusts the pace pulse energy level, reducing energy when capture is confirmed and increasing energy when capture is lost, thereby optimizing the balance between capture reliability and energy consumption
Solution Approach 2:
The pace pulse energy level is made dynamic rather than fixed. The system continuously monitors capture status through sensing evoked response signals and adjusts the energy level in real-time based on detected capture conditions, allowing the system to operate at minimum effective energy levels while maintaining reliable capture
2Productivity
If multi-chamber pacing is implemented to coordinate ventricular contractions, then cardiac pumping efficiency is improved, but device complexity increases
Solution Approach 1:
The system combines pacing and sensing functions into an integrated multi-chamber system. Electrodes are positioned to both deliver pace pulses to multiple chambers and sense the resulting evoked response signals, allowing coordinated control of atrial and ventricular contractions while using a unified device architecture rather than separate systems
Solution Approach 2:
The pacemaker system performs multiple functions through a single integrated device: it paces multiple chambers (atria and ventricles), senses electrical signals from these chambers, detects capture status, and adjusts pacing parameters. This multi-functional approach achieves coordinated ventricular contraction for improved pumping efficiency while avoiding the complexity of multiple separate devices
3Use of energy by moving object
If capture detection is implemented to optimize pace energy, then energy management is improved, but measurement precision requirements increase
Solution Approach 1:
The system uses an intermediary evoked response signal as a mediator between the pace pulse and the capture status determination. This evoked response serves as an intermediate indicator that reflects whether capture occurred, allowing the system to infer capture status indirectly through signal analysis rather than requiring direct mechanical or electrical measurement of capture with high precision
Data Source
AI summary
Multi-chamber pacing may result in capture of one chamber, capture of multiple chambers, fusion, or non-capture. Approaches for detecting various capture conditions during multi-chamber pacing are described. Pacing pulses are delivered to left and right heart chambers during a cardiac cycle. A cardiac electrogram signal is sensed following the delivery of the pacing pulses. Left chamber capture only, right chamber capture only, and bi-chamber capture may be distinguished based on characteristics of the cardiac electrogram signal. Multi-chamber capture detection may be implemented using detection windows having dimensions of time and amplitude. The detection windows are associated with expected features, such as expected signal peaks, under a particular capture condition. The cardiac electrogram signal features are compared to detection windows to determine the capture condition.