CRT Pacing Adjustment for Loss of Effective Ventricular Capture
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Solution Overview
Problem
Cardiac pacing systems often fail to achieve effective capture of the ventricles due to suboptimal lead placement, migration, or positioning within scar tissue, leading to ineffective cardiac resynchronization therapy (CRT) delivery.
Innovation Solution
An implantable medical device system that monitors CRT pacing effectiveness, determines the reason for ineffective capture, and automatically adjusts settings such as safety margins, left ventricular pre-excitation, and pacing vectors to optimize ventricular capture, switching to minimum ventricular pacing mode if necessary and generating alarms when effective capture is low.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If automatic adjustment features are enabled to optimize ventricular capture, then the effectiveness of CRT pacing is improved, but the device complexity increases
Solution Approach 1:
The device automatically monitors ventricular capture effectiveness and adjusts pacing parameters without requiring external intervention. The processor continuously evaluates capture status and autonomously modifies pacing settings to maintain optimal therapy delivery
Solution Approach 2:
The system implements a closed-loop feedback mechanism where the processor monitors ventricular capture responses and uses this information to dynamically adjust pacing parameters. The capture effectiveness data feeds back into the control algorithm to optimize therapy delivery in real-time
2Adaptability or versatility
If multiple adjustment options are implemented (safety margin, pre-excitation, vector adjustment) to resolve ineffective capture, then the adaptability of the system is improved, but the device complexity increases
Solution Approach 1:
The system dynamically switches between multiple pacing strategies including safety margin adjustment, pre-excitation modification, and vector reconfiguration. These adjustable parameters allow the device to adapt to different capture failure scenarios and optimize therapy delivery
Solution Approach 2:
The processor modifies pacing parameters such as safety margins, pre-excitation timing, and delivery vectors to resolve capture ineffectiveness. By changing these controllable parameters, the system adapts to varying physiological conditions and lead positions
3Reliability
If continuous monitoring of CRT pacing effectiveness is performed to detect loss of capture, then the reliability of therapy delivery is improved, but the use of energy increases
Solution Approach 1:
The processor continuously monitors ventricular capture effectiveness by analyzing paced QRS complexes in real-time. This continuous detection ensures reliable identification of capture loss events while maintaining optimal therapy delivery throughout the device's operation
Data Source
AI summary
An implantable medical device system and method for delivering cardiac resynchronization therapy (CRT) pacing that includes determining capture associated with the delivered CRT pacing is ineffective in response to the delivered CRT pacing. A reason for capture being ineffective is determined and a safety margin is adjusted if the determined reason for capture being ineffective is loss of capture and a left ventricle (LV) pre-excitation is adjusted if the determined reason for capture being ineffective is delayed LV depolarization. Monitoring for a change in effective cardiac resynchronization therapy is used to confirm that the adjustment of the CRT pacing was effective in resolving the ineffective capture.