Latency-Based ATP Therapy Adaptation for Capture Loss
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Solution Overview
Problem
Traditional anti-tachyarrhythmia pacing (ATP) therapy systems often wait for an indication of loss of capture before adapting the delivery of ATP therapy, leading to inefficiencies such as loss of capture, delivery of unnecessary pulses, and prolonged time to successful termination of tachyarrhythmias.
Innovation Solution
The system modifies ATP therapy by determining latency metrics of evoked responses to pacing pulses and adjusting the therapy delivery accordingly, preventing loss of capture and optimizing the termination of tachyarrhythmias.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional ATP therapy systems wait for loss of capture indication before adapting therapy delivery, then the system maintains simplicity in control logic, but this results in loss of capture, delivery of unnecessary pulses, and prolonged time to successful termination of tachyarrhythmias
Solution Approach 1:
The system performs preliminary detection of evoked responses and determination of latency metrics before loss of capture occurs. By monitoring the latency of evoked responses in real-time during ATP delivery, the system can predict impending loss of capture and adapt therapy parameters proactively, rather than waiting for loss of capture to be detected after it has already occurred.
Solution Approach 2:
The system implements continuous feedback by monitoring latency metrics of evoked responses during ATP therapy delivery. The detected latency changes are fed back to the control system, which automatically adjusts pulse timing and delivery parameters to maintain optimal capture, thereby preventing loss of capture and reducing unnecessary pulse delivery.
2Device complexity
If traditional ATP therapy systems deliver pulses without real-time latency monitoring, then the device complexity is reduced, but this leads to delivery of wasteful pulses and loss of capture
Solution Approach 1:
The system replaces complex mechanical or hardware-based capture verification mechanisms with a more efficient signal processing approach. By using software-based latency metric analysis of evoked responses, the system achieves real-time monitoring and adaptive control without requiring additional complex hardware components, thus balancing improved performance with acceptable device complexity.
Solution Approach 2:
The system uses the heart's own evoked responses as the sensing signal for latency monitoring. Rather than requiring separate sensing electrodes or additional verification pulses, the system analyzes the latency of the heart's natural electrical responses to pacing pulses, allowing the therapeutic system to monitor its own effectiveness and self-adjust parameters to optimize energy efficiency.
3Ease of operation
If ATP therapy uses fixed pulse timing intervals, then the therapy delivery is simple and predictable, but this results in prolonged time to successful termination and potential loss of capture as refractory periods change
Solution Approach 1:
The system transitions from fixed, static pulse timing intervals to dynamic, adaptive intervals based on real-time latency metric monitoring. As the heart's refractory periods change during tachyarrhythmia evolution, the system automatically adjusts pulse timing to maintain optimal effectiveness, thereby improving termination efficiency while maintaining operational simplicity through automated adaptation.
Solution Approach 2:
The system dynamically changes key therapy parameters, particularly pulse timing intervals and inter-pulse intervals, based on detected latency metrics. By modifying these parameters in response to real-time physiological feedback, the system optimizes ATP delivery effectiveness and accelerates tachyarrhythmia termination without requiring complex manual reconfiguration.
Data Source
AI summary
A medical device comprises therapy delivery circuitry and processing circuitry. The therapy delivery circuitry is configured to deliver anti-tachycardia pacing (ATP) therapy to a heart of a patient. The ATP therapy includes one or more pulse trains and each of the one or more pulse trains includes a plurality of pacing pulses. The processing circuitry is configured to, for at least one of the plurality of pacing pulses of at least one of the one or more pulse trains, determine at least one latency metric of an evoked response of the heart to the pacing pulse. The processing circuitry is further configured to modify the ATP therapy based on the at least one latency metric.