Closed-Loop ATP Control Using Hemodynamic Signal Verification
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Solution Overview
Problem
Current anti-tachyarrhythmia pacing (ATP) systems face challenges in accurately timing ATP delivery, leading to inefficiencies and potential acceleration of ventricular tachyarrhythmias to fibrillation, due to the lack of real-time verification of myocardial capture during ATP therapy.
Innovation Solution
A hemodynamic sensor-controlled closed-loop ATP system that verifies effective cardiac contractions using sensed hemodynamic signals, adjusting ATP delivery protocols in real-time to optimize therapy and prevent unnecessary or risky pulse delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ATP pulses are delivered to terminate tachyarrhythmia, then the tachyarrhythmia can be terminated effectively, but the timing accuracy must be precise to avoid acceleration to fibrillation
Solution Approach 1:
The system continuously monitors hemodynamic signals during ATP delivery and uses this feedback to verify myocardial capture in real-time. The ATP controller adjusts timing based on the detected hemodynamic response, creating a closed-loop control system that ensures precise timing while maintaining therapy effectiveness.
Solution Approach 2:
The patent replaces traditional electrical sensing with hemodynamic signal monitoring to verify ATP capture. By using mechanical/hemodynamic signals (blood pressure, flow) instead of purely electrical signals, the system achieves more reliable verification of myocardial capture and better timing control.
2Measurement precision
If real-time hemodynamic monitoring is implemented for ATP verification, then capture accuracy is improved, but device complexity increases
Solution Approach 1:
The hemodynamic sensor serves multiple functions: it monitors cardiac function during normal operation, verifies ATP capture during therapy, and provides data for timing adjustments. This multi-functionality reduces the need for separate verification systems, thereby limiting the increase in device complexity.
Solution Approach 2:
The hemodynamic signal acts as an intermediary between the ATP delivery system and the myocardium. By monitoring the hemodynamic response, the system indirectly verifies capture without requiring direct electrical measurement of myocardial depolarization, simplifying the verification mechanism.
3Productivity
If ATP delivery timing is optimized using hemodynamic feedback, then unnecessary defibrillation shocks are reduced, but the system requires continuous signal processing
Solution Approach 1:
The system performs signal processing selectively rather than continuously at full capacity. It monitors hemodynamic signals during critical periods (ATP delivery and immediate aftermath) while using reduced processing during stable periods, thereby reducing overall energy consumption while maintaining high productivity.
Data Source
AI summary
A cardiac rhythm management (CRM) system includes an implantable medical device that delivers anti-tachyarrhythmia therapies including anti-tachyarrhythmia pacing (ATP) and a hemodynamic sensor that senses a hemodynamic signal. The implantable medical device includes a hemodynamic sensor-controlled closed-loop ATP system that uses the hemodynamic signal for ATP capture verification. When ATP pulses are delivered according to a selected ATP protocol to terminate a tachyarrhythmia episode, the implantable medical device performs the ATP capture verification by detecting an effective cardiac contraction from the hemodynamic signal. The ATP protocol is adjusted using an outcome of the ATP capture verification.