Adaptive Conduction System Pacing for AV Synchrony
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Solution Overview
Problem
Achieving atrioventricular and interventricular synchrony in conduction system pacing is challenging due to varying electrical signal travel rates and changing levels of dyssynchrony in patients, especially those with first-degree heart block, which complicates the delivery of effective cardiac resynchronization therapy.
Innovation Solution
An implantable medical device system that automatically determines a patient-specific timing regime by sensing intrinsic delays and administering cardiac pacing based on whether a first-degree heart block is present, using fewer leads and mimicking the heart's native conduction system to achieve synchrony.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional CRT with three leads is used to achieve cardiac resynchronization, then AV and interventricular synchrony can be achieved, but device complexity and battery power consumption increase
Solution Approach 1:
The patent extracts the essential function of cardiac resynchronization from the traditional three-lead CRT system and implements it through conduction system pacing using fewer leads. By targeting the native conduction system (His bundle or bundle branches), the invention achieves AV and interventricular synchrony without requiring separate leads for each ventricle, thus reducing device complexity while maintaining therapeutic effectiveness
Solution Approach 2:
The patent makes a single lead perform multiple functions by using it for both pacing and sensing in the conduction system. The lead placed in the right ventricle serves to pace the His bundle or bundle branches and sense cardiac activity, replacing the need for separate leads that would traditionally be required for CRT, thereby reducing overall device complexity
2Reliability
If traditional CRT with three leads is used to achieve cardiac resynchronization, then AV and interventricular synchrony can be achieved, but battery power consumption increases
Solution Approach 1:
The patent reduces battery power consumption by extracting the resynchronization function from the energy-intensive three-lead CRT configuration and implementing it through conduction system pacing with fewer leads. The native conduction system's efficient electrical propagation reduces the energy required compared to pacing both ventricles separately through multiple leads
Solution Approach 2:
By using a single lead for both pacing and sensing functions in the conduction system, the patent reduces the total number of active electrical components and connections, thereby reducing overall power consumption compared to traditional CRT that requires multiple leads with separate pacing and sensing functions
3Ease of operation
If fixed timing regime for conduction system pacing is used, then device operation is simplified, but AV and interventricular synchrony cannot be maintained in patients with varying intrinsic delays
Solution Approach 1:
The patent implements dynamic adjustment of pacing timing intervals based on real-time sensing of intrinsic cardiac delays. The device continuously monitors the PR interval and other conduction parameters, automatically adjusting the AV and ventricular pacing intervals to maintain optimal synchrony as the patient's intrinsic conduction properties change, thereby resolving the contradiction between operational simplicity and synchrony reliability
Solution Approach 2:
The patent employs feedback mechanisms where the device senses intrinsic cardiac electrical activity and uses this information to adjust pacing timing. By monitoring the heart's natural conduction delays and adjusting the pacing intervals accordingly, the system maintains AV and interventricular synchrony adaptively, ensuring reliable performance despite variations in patient physiology
4Device complexity
If conduction system pacing is used to reduce leads and power consumption, then device benefits are improved, but achieving proper AV and interventricular synchrony becomes more challenging
Solution Approach 1:
The patent compensates for the reduced hardware complexity by implementing dynamic timing adjustment algorithms that adapt to each patient's intrinsic conduction properties. The device continuously optimizes pacing intervals based on sensed cardiac activity, ensuring reliable AV and interventricular synchrony is achieved and maintained despite using fewer leads
Data Source
AI summary
An implantable medical device system is configured to generate signals representing activity of a heart of a patient; determine, based on the signals, an intrinsic delay of the heart of the patient; determine whether the intrinsic delay is indicative of a first-degree heart block being present in the heart of the patient; determine a patient-specific timing regime for conduction system pacing based on whether the intrinsic delay is indicative of the first-degree heart block being present in the heart of the patient; and administer cardiac pacing to a native conduction system of the heart of the patient based on the timing regime.