Atrial-Synchronous Ventricular Pacing Rate Smoothing
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Solution Overview
Problem
Existing cardiac pacemakers struggle to maintain a consistent heart rhythm by synchronizing atrial and ventricular pacing, leading to abrupt changes in ventricular rate and potential tachyarrhythmias.
Innovation Solution
A ventricular pacemaker that senses atrial systolic events to synchronize ventricular pacing pulses, using a rate smoothing interval and post-sense pacing interval to control ventricular pacing, thereby reducing the risk of tachyarrhythmias.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a ventricular pacemaker delivers ventricular pacing pulses without rate smoothing, then the ventricular pacing can be simple and responsive to atrial events, but abrupt changes in ventricular rate occur leading to tachyarrhythmias
Solution Approach 1:
The pacemaker dynamically adjusts the ventricular pacing interval based on the relationship between the current ventricular pacing interval and a predetermined rate smoothing interval. When the current interval is greater than the rate smoothing interval, the pacemaker delivers pacing pulses at the rate smoothing interval to gradually increase ventricular rate. When the current interval is less than or equal to the rate smoothing interval, the pacemaker delivers pacing pulses at the current interval to maintain or gradually decrease ventricular rate, preventing abrupt rate changes and tachyarrhythmias.
Solution Approach 2:
The pacemaker changes the pacing interval parameter based on real-time comparison with the rate smoothing interval. The system monitors the current ventricular pacing interval and adjusts the next pacing interval accordingly - either maintaining it or changing it to the rate smoothing interval, thereby controlling the ventricular rate progression to avoid sudden changes that could trigger tachyarrhythmias.
2Adaptability or versatility
If a ventricular pacemaker uses fixed ventricular pacing intervals, then the pacing mechanism is simple, but the ventricular rate cannot adapt to maintain regular rhythm and prevent tachyarrhythmias
Solution Approach 1:
The pacemaker employs a feedback mechanism where each delivered ventricular pacing pulse triggers determination of a new current ventricular pacing interval based on the time since the previous pulse. This real-time feedback allows the system to continuously adapt the pacing interval compared to the rate smoothing interval, enabling dynamic ventricular rate adaptation that prevents tachyarrhythmias while managing algorithm complexity through efficient interval tracking.
Data Source
AI summary
A medical device is configured to determine a rate smoothing pacing interval based on at a ventricular cycle length ending with a ventricular pacing pulse and determine a post-sense ventricular pacing interval based on a ventricular cycle length ending with a sensed ventricular event signal. The medical device may be configured to start a ventricular pacing interval set to the post-sense ventricular pacing interval in response to the sensed ventricular event signal and generate a ventricular pacing pulse in response to the expiration of the post-sense ventricular pacing interval.