HIS Bundle Pacing Atrial Oversensing Avoidance
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Solution Overview
Problem
Current HIS bundle pacing systems face challenges in avoiding oversensing of atrial activity due to similar amplitudes of near-field atrial and far-field ventricular signals, leading to inefficiencies in ventricular refractory period settings and blanking periods, which are not universally effective across all patients.
Innovation Solution
A method and system that utilize P-wave duration, intrinsic atrial-HIS delay, and intrinsic atrial conduction delay to calculate an atrial oversensing avoidance window, adjust ventricular event sensitivity profiles, and manage HIS bundle pacing to differentiate between atrial and ventricular signals, thereby reducing oversensing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If manually programmed sensitivity parameters and extended ventricular blanking periods are used to avoid oversensing, then atrial activity oversensing is reduced, but pacing efficiency and ventricular event detection accuracy deteriorate
Solution Approach 1:
The patent implements dynamic adjustment of the ventricular blanking period based on detected atrial event characteristics. The blanking period is extended only when atrial signals are detected during the alert period, and adjusted according to the P-wave duration and intrinsic atrial-HIS delay. This dynamic approach prevents fixed parameter limitations, allowing the system to maintain high pacing efficiency while avoiding oversensing only when necessary.
Solution Approach 2:
The system changes sensitivity parameters dynamically based on signal characteristics. The ventricular event sensitivity profile is adjusted according to the detected atrial activity patterns, P-wave duration, and conduction delays. This allows the system to differentiate between atrial and ventricular signals by modifying detection thresholds adaptively, resolving the contradiction between avoiding oversensing and maintaining detection accuracy.
2Device complexity
If fixed ventricular refractory period settings are used, then oversensing prevention is simplified, but accuracy in detecting true ventricular events deteriorates
Solution Approach 1:
The system incorporates feedback mechanisms where detected atrial events and their characteristics (P-wave duration, conduction delay) are used to adjust subsequent blanking period settings. The ventricular refractory period is modified based on feedback from signal analysis, allowing the system to learn and adapt to individual patient characteristics. This feedback loop maintains detection accuracy while managing complexity through automated adjustment.
Solution Approach 2:
The system performs self-adjustment of blanking period parameters based on intrinsic patient physiology. By automatically detecting P-wave characteristics and conduction delays, the device self-configures optimal sensing parameters without requiring manual programming. This self-service capability resolves the contradiction by making the system as simple to use as fixed parameters while achieving the precision of customized settings.
3Object-affected harmful factors
If extended ventricular blanking periods are programmed to cover peak atrial signals, then atrial oversensing is avoided, but detection of early ventricular events is delayed
Solution Approach 1:
The ventricular blanking period is implemented as a dynamic parameter that extends beyond fixed timing windows. The blanking period adapts its duration and timing based on real-time detection of atrial event characteristics, allowing it to cover peak atrial signals only when necessary. This dynamic timing prevents fixed blanking periods from causing unnecessary delays in ventricular event detection.
Solution Approach 2:
The system performs preliminary analysis of atrial signal characteristics (P-wave duration, conduction delay) to predict when atrial oversensing might occur. Based on this preliminary assessment, the ventricular blanking period is proactively adjusted to cover only the necessary time window for potential atrial interference, minimizing detection delays while maintaining protection against oversensing.
Data Source
AI summary
Methods and systems are provided herein for pacing a HIS bundle of a patient heart using an implantable medical device (IMD). The methods and systems obtain cardiac activity (CA) signals over a HIS sensing channel, the HIS sensing channel utilizing a HIS electrode; identify at least one of a P-wave duration (PWD), an intrinsic atrial-HIS (AH) delay, or an intrinsic atrial conduction delay (IACD); calculate an atrial oversensing avoidance (AOA) window based on at least one of the PWD, AH delay or IACD; analyze the CA signals, obtained over the HIS sensing channel during the AOA window, for an atrial activity (AA) component; based on the analyzing operation, adjust a ventricular event (VE) sensitivity profile utilized by the HIS sensing channel; monitor the CA signals, obtained over the HIS sensing channel during an alert window based on the VE sensitivity profile, for a ventricular component indicative of a ventricular event; and manage HIS bundle pacing based on the ventricular event.