Managed Ventricular Pacing Protocol for AV Synchrony
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional implantable medical devices often rely on extreme pacing modes that either fail to promote intrinsic conduction or result in excessive ventricular pacing, which can be detrimental to cardiac health, particularly by causing unnatural depolarization and potential arrhythmias.
Innovation Solution
The implementation of Managed Ventricular Pacing (MVP) protocols that selectively operate in atrial-based modes to minimize ventricular pacing, utilizing a truncated post-atrial ventricular blanking period (PAVB) and crosstalk window to enhance intrinsic conduction and reduce unnecessary ventricular pacing, thereby maintaining AV synchrony and preventing potential proarrhythmic conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If DDD/R mode is used to maintain AV synchrony, then AV synchrony is maintained, but ventricular pacing occurs in a very high percentage of cardiac cycles
Solution Approach 1:
The device dynamically adjusts the post-atrial ventricular blanking period (PAVB) based on detected ventricular events. When a ventricular event is detected within the crosstalk window, the PAVB is truncated, allowing the device to adaptively promote intrinsic conduction while maintaining AV synchrony, thereby reducing excessive ventricular pacing
Solution Approach 2:
The invention changes the timing parameter of the post-atrial ventricular blanking period from a fixed value to a variable value that can be truncated based on detected ventricular events. This parameter change enables the device to distinguish between true ventricular events and atrial crosstalk, reducing unnecessary ventricular pacing while maintaining AV synchrony
2Reliability
If ventricular pacing is used to ensure adequate ventricular contraction, then ventricular contraction is maintained, but unnatural depolarization and potential arrhythmias occur
Solution Approach 1:
The invention converts the potentially harmful effect of atrial crosstalk during the PAVB into a beneficial detection mechanism. By monitoring for ventricular events within the crosstalk window and truncating the PAVB when events are detected, the device uses what would normally be a sensing blind period to instead promote intrinsic conduction and prevent harmful ventricular pacing
Solution Approach 2:
The crosstalk window acts as an intermediary detection mechanism between the atrial pacing pulse and ventricular sensing. It allows the device to indirectly detect ventricular events that occur during the blanking period by monitoring for the absence or presence of expected crosstalk signals, thereby enabling more accurate ventricular event detection and reducing unnatural ventricular pacing
3Measurement precision
If post-atrial ventricular blanking period is extended to avoid sensing atrial pacing signals as ventricular activity, then false ventricular sensing is prevented, but intrinsic conduction is precluded
Solution Approach 1:
The device dynamically adjusts the post-atrial ventricular blanking period based on detected ventricular events. When a ventricular event is detected within the crosstalk window, the PAVB is truncated to a shorter duration, allowing intrinsic conduction while maintaining accurate ventricular event sensing through the crosstalk window monitoring mechanism
Data Source
AI summary
An implantable medical device operates according to a ventricular pacing protocol (VPP) that precludes ventricular pacing in any cardiac cycle where a sensed ventricular event has occurred in the preceding cycle. Improved ventricular sensing, detection and classification is provided.