Dynamic Left Ventricular Pacing Delay Adjustment
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Solution Overview
Problem
Current cardiac resynchronization therapy (CRT) systems face challenges in determining optimal pacing parameters to ensure consistent capture and synchronization of left ventricular pacing, particularly in patients with congestive heart failure, where conduction delays affect the efficiency of heart contractions.
Innovation Solution
The method involves measuring intrinsic depolarization intervals and adjusting pacing delays for both ventricles based on detected intrinsic depolarizations, verifying capture, and adjusting pacing energy parameters to optimize cardiac resynchronization therapy, using a system with sensing and pacing circuitry to determine and adjust pacing delays dynamically.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fixed pacing delays are used for CRT pacing, then the device complexity is reduced, but the reliability of consistent ventricular capture deteriorates due to variations in intrinsic conduction intervals
Solution Approach 1:
The patent implements dynamic adjustment of pacing delays based on detected intrinsic depolarization intervals. The system continuously monitors the intrinsic conduction intervals and adapts the pacing delays in real-time to maintain optimal synchronization, transforming a static fixed-delay system into a dynamic adaptive system that responds to physiological variations.
Solution Approach 2:
The system employs feedback mechanisms by detecting intrinsic depolarization events and using this information to adjust subsequent pacing delays. The measured intrinsic intervals feed back into the control algorithm, which modifies the pacing parameters to ensure consistent capture, creating a closed-loop control system that improves reliability.
2Reliability
If pacing delays are dynamically adjusted based on intrinsic intervals, then the reliability of ventricular capture is improved, but the device complexity increases due to additional sensing and control requirements
Solution Approach 1:
The patent makes the pacing system multi-functional by combining sensing capabilities with pacing delivery and adaptive control in a single integrated device. The implantable pulse generator performs multiple functions: detecting intrinsic depolarizations, measuring intervals, calculating optimal delays, and delivering paced stimuli, thereby reducing the need for separate dedicated devices.
Solution Approach 2:
The system serves itself by using its own sensed intrinsic intervals to automatically adjust its pacing parameters. The device monitors its own performance and self-regulates the pacing delays without requiring external intervention or complex external programming systems, enabling autonomous adaptation to physiological changes.
3Reliability
If pacing energy parameters are increased to ensure capture, then the reliability of ventricular pacing is improved, but the use of energy increases
Solution Approach 1:
The patent dynamically changes pacing parameters including energy levels based on detected intrinsic intervals and capture status. The system adjusts pulse amplitude, width, and timing parameters in real-time to achieve capture at the lowest necessary energy level, optimizing the balance between reliability and energy consumption through adaptive parameter modification.
Data Source
AI summary
A method of operating a cardiac therapy system to deliver cardiac resynchronization therapy (CRT) pacing that includes pacing both ventricles or pacing only the left ventricle is described. Delivery of the CRT pacing to one or both ventricles is scheduled for a cardiac cycle. If an intrinsic depolarization of a ventricle is detected during a pacing delay of the ventricle, then the scheduled CRT pacing to the ventricle is inhibited for the cycle. The intrinsic interval of the ventricle, such as the intrinsic atrioventricular interval concluded by the intrinsic depolarization, is measured. During a subsequent cardiac cycle, the pacing delay of the ventricle is decreased to be less than or equal to the measured intrinsic interval. Capture of the ventricle is verified after pacing is delivered during the subsequent cardiac cycle.