Pacemaker Intrinsic Beat Search Algorithm
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Solution Overview
Problem
After procedures like Transcatheter Aortic Valve Replacement (TAVR), the heart's conduction system may be temporarily or permanently damaged, making it difficult to determine which patients will recover intrinsic heart beats and which will require permanent ventricular pacing, as existing medical devices lack the ability to assess and adapt therapy based on the heart's intrinsic activity.
Innovation Solution
An implantable medical device (IMD) that senses cardiac activity, performs an intrinsic beat search algorithm by pacing the heart at reduced rates, and adjusts therapy based on the presence of sustained intrinsic beats, allowing for data collection and transmission to external devices for physician evaluation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the IMD continuously paces the ventricle at a fixed therapy-based rate, then reliable ventricular pacing is ensured, but the device cannot adapt to potential recovery of intrinsic heart beats
Solution Approach 1:
The IMD dynamically adjusts the pacing rate by implementing an intrinsic beat search algorithm that temporarily reduces the pacing rate to detect intrinsic beats, then adapts the therapy based on detection results. This transforms the fixed-rate pacing system into a dynamic one that can respond to physiological changes.
Solution Approach 2:
The system incorporates feedback through the intrinsic beat search algorithm, where the IMD senses electrical signals, determines whether intrinsic beats are present, and adjusts pacing therapy accordingly. This closed-loop feedback mechanism enables the device to adapt to recovery of intrinsic heart function.
2Measurement precision
If the IMD performs frequent intrinsic beat searches at reduced pacing rates, then detection precision of intrinsic beats is improved, but device operation complexity and energy consumption increase
Solution Approach 1:
The IMD performs intrinsic beat searches periodically at scheduled intervals rather than continuously, reducing operational complexity while maintaining detection capability. The system temporarily reduces pacing rate at these periodic intervals to create opportunities for intrinsic beat detection without constant intervention.
Solution Approach 2:
The system performs preliminary intrinsic beat searches at reduced pacing rates before committing to long-term pacing rate changes. This preliminary assessment allows the IMD to gather data on intrinsic beat capability without immediately altering therapy, reducing the risk of inappropriate therapy changes.
3Measurement precision
If the IMD implements an intrinsic beat search algorithm with multiple pacing rate reductions, then detection accuracy of sustained intrinsic beats is improved, but the time required for therapy assessment increases
Solution Approach 1:
The IMD implements a multi-level intrinsic beat search where it first tests at a moderate rate reduction, and only proceeds to more aggressive rate reductions if initial tests are inconclusive. This partial action approach achieves high detection accuracy while minimizing the total time required, as the system often finds answers at the first or second testing level without needing to proceed through all possible rate reductions.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables the IMD to determine the presence of sustained intrinsic beats, potentially reducing the need for continuous pacing by allowing the heart to operate at its intrinsic rate, thereby improving heart function and reducing device-related therapy.
Implementation Method 1
sense electrical cardiac activity of a patient's heart
Data Source
AI summary
Regulating cardiac activity may include pacing the patient's heart at a starting pacing rate and instigating an intrinsic heart beat search algorithm that includes pacing at a reduced rate for a period of time and capturing electrical signals representative of cardiac electrical activity while pacing at the reduced rate in order to determine a presence or absence of intrinsic heart beats. If intrinsic heart beats are not detected, the heart may be paced at a further reduced rate for a period of time. If intrinsic beats are detected, the heart may be paced again at the starting pacing rate. This may continue until intrinsic heart beats are detected or until a lower search rate limit is reached. Diagnostic data may be collected at each stage and transmitted to a display device for analysis by a physician or the like.