Ventricular Pacing Protocol for Intrinsic Conduction
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Solution Overview
Problem
Conventional implantable medical devices often rely on extreme pacing modes that either neglect intrinsic conduction or preclude it, leading to excessive ventricular pacing, which can be detrimental and inefficient, particularly in patients with intact or partially intact AV conduction.
Innovation Solution
The implementation of a ventricular pacing protocol (VPP) that promotes intrinsic conduction by selectively operating in atrial-based pacing modes, using a truncated post-atrial ventricular blanking period (PAVB) and crosstalk window management to minimize unnecessary ventricular pacing and ensure accurate sensing of cardiac events.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
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 patent implements dynamic mode switching between DDD/R and AAI/R pacing modes based on real-time detection of intrinsic ventricular events. The system transitions from a fixed DDD/R mode to a dynamic system that adapts its pacing strategy, reducing ventricular pacing when intrinsic conduction is present while maintaining AV synchrony when needed.
Solution Approach 2:
The system changes the pacing mode parameter dynamically based on detected cardiac events. When a ventricular event is sensed during the A-A interval, the system switches to AAI/R mode to promote intrinsic conduction; when no ventricular event occurs, it provides ventricular backup pacing. This parameter change resolves the contradiction by adapting the pacing strategy to actual cardiac physiology.
2Reliability
If ventricular pacing is used to ensure reliable ventricular activation, then ventricular activation is reliable, but intrinsic conduction is precluded and unnatural depolarization propagation occurs
Solution Approach 1:
The system uses feedback from ventricular event sensing to control ventricular pacing delivery. By monitoring for intrinsic ventricular events during the A-A interval and using this information to inhibit or deliver ventricular pacing accordingly, the system promotes intrinsic conduction when present while maintaining reliable ventricular activation when needed, thereby reducing unnatural depolarization propagation.
3Reliability
If a standard post-atrial ventricular blanking period is used to avoid sensing artifacts, then artifact sensing is prevented, but premature ventricular contractions may be undersensed
Solution Approach 1:
The patent segments the post-atrial blanking period into two distinct phases: a truncated first portion (PAVB1) that is shortened to allow detection of premature ventricular contractions, and a second portion (PAVB2) that provides adequate blanking to prevent artifact sensing. This segmentation resolves the contradiction by allowing PVC detection during the first phase while maintaining sensing accuracy during the second phase.
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.