AV Conduction Check Scheduling for Implantable Pacemakers
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Solution Overview
Problem
Current implantable medical devices experience frequent and unnecessary pacing mode switching and AV conduction checks due to false positive detections of AV conduction, particularly in patients with idioventricular rhythms or premature ventricular contractions, leading to inefficient ventricular pacing.
Innovation Solution
Implementing a method that schedules AV conduction checks at increasingly longer intervals based on the duration of atrial-only pacing mode, using a false AV conduction timer to differentiate between true and false positive detections, and adjusting the pacing mode accordingly to minimize frequent mode switching and conduction checks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If AV conduction checks are performed periodically in dual chamber pacing mode, then AV conduction block can be detected and atrial pacing can be resumed, but false positive detections occur in patients with idioventricular rhythms or PVCs causing frequent unnecessary pacing mode switching
Solution Approach 1:
The system performs preliminary discrimination of ventricular depolarizations before conducting AV conduction checks. By analyzing whether ventricular events are conducted from the atrium or arising independently from the ventricular region, the system prepares the detection framework to avoid false positives. This preliminary classification prevents unnecessary pacing mode switching by identifying true versus false AV conduction presence before the actual conduction check occurs.
Solution Approach 2:
The system incorporates feedback mechanisms where the outcome of each AV conduction check is analyzed to determine if it represents a true positive or false positive detection. When false positives are identified (particularly in patients with idioventricular rhythms or PVCs), the system adjusts its detection criteria and scheduling accordingly. This feedback loop improves detection accuracy over time while reducing frequent pacing mode switching caused by erroneous detections.
2Speed
If AV conduction checks are scheduled at short intervals to quickly detect AV conduction recovery, then rapid resumption of atrial pacing is possible, but frequent checks increase device activity and power consumption
Solution Approach 1:
The system dynamically adjusts the scheduling interval for AV conduction checks based on clinical context and detection history. Rather than using fixed short intervals, the scheduling algorithm adapts the check frequency to balance rapid detection needs with power conservation. When AV conduction block is detected, checks are scheduled more frequently; when conduction is stable or false positives are identified, intervals are extended. This dynamic scheduling maintains detection speed while significantly reducing unnecessary device activity and power consumption.
3Reliability
If the pacemaker switches to atrial pacing mode upon detecting AV conduction, then naturally-conducted ventricular activation is promoted, but false positive detections cause unnecessary mode switching and reset of AV conduction check timers
Solution Approach 1:
Before switching pacing modes, the system performs preliminary verification to distinguish true AV conduction from false positive detections. By analyzing the origin of ventricular depolarizations and checking conduction relationships in advance, the system ensures that mode switching occurs only when truly warranted. This preliminary action prevents unnecessary transitions between atrial and dual chamber pacing modes, simplifying the effective control logic while maintaining reliable ventricular activation.
Solution Approach 2:
The system uses feedback from the pacing mode transition outcomes to refine its detection algorithm. When mode switching to atrial pacing is followed by rapid reversion to dual chamber mode (indicating a false positive), the system learns from this pattern and adjusts its detection criteria. This feedback mechanism reduces spurious mode switching over time while preserving the beneficial effect of promoting naturally-conducted ventricular activation when true AV conduction is present.
Data Source
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AI summary
A medical device and associated method deliver cardiac pacing in a dual chamber pacing mode and schedule an atrial-ventricular (AV) conduction check during the dual chamber pacing mode to detect the presence of AV conduction. If AV conduction is detected during the scheduled AV conduction check, the medical device switches to an atrial pacing mode and switches back to the dual chamber pacing mode in response to an absence of AV conduction during the atrial pacing mode. The detected AV conduction is identified as a false positive detection in response to the pacing mode switch to the dual chamber pacing mode occurring within a predetermined interval of time from detecting the AV conduction.