Adaptive Pacing Control for Cardiac Hemodynamics
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Solution Overview
Problem
Cardiac rhythm management devices struggle to efficiently manage cardiac hemodynamics, particularly in heart failure patients, where unsynchronized contractions lead to decreased cardiac output and increased stress on the heart, necessitating adaptive pacing strategies to optimize cardiac function based on activity level, posture, and circadian rhythms.
Innovation Solution
An implantable medical device system that dynamically adjusts pacing parameters such as atrial-ventricular delay, interventricular delay, pacing pulse amplitude, and pacing vectors to increase cardiac output during active periods and decrease it during rest periods, allowing the heart to rest and recover, thereby matching cardiac load with hemodynamic demand.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If pacing therapy is continuously applied to maximize cardiac output, then cardiac output is improved, but heart muscle stress and energy consumption increase
Solution Approach 1:
The patent implements periodic pacing therapy that alternates between high-intensity pacing to maximize cardiac output during active periods and low-intensity or no pacing during rest periods. This periodic modulation allows the heart muscle to experience reduced stress and energy consumption during designated rest intervals while still achieving adequate cardiac output during periods when it is needed, thereby resolving the contradiction between maintaining high productivity and reducing energy use.
2Productivity
If pacing parameters are adjusted to increase ventricular contractility, then cardiac output is improved, but cardiac work and heart stress increase
Solution Approach 1:
The patent dynamically adjusts pacing parameters including atrial-ventricular delay, interventricular delay, and pacing pulse characteristics based on real-time detection of patient activity level, posture, and circadian rhythm. During active periods, parameters are optimized to increase ventricular contractility and cardiac output. During rest periods, parameters are reduced to lower cardiac work and allow heart recovery, thus dynamically balancing the contradiction between improving productivity and reducing power consumption.
Solution Approach 2:
The system incorporates feedback mechanisms that continuously monitor physiological parameters such as activity level, posture, and circadian rhythm patterns. Based on this feedback, the pacing therapy is automatically adjusted to match the patient's hemodynamic demands. This feedback loop ensures that increased ventricular contractility and cardiac output are achieved only when necessary, while allowing reduction in cardiac work during rest periods, thereby resolving the contradiction between improving cardiac output and reducing cardiac work.
3Productivity
If adaptive pacing strategies are implemented to match hemodynamic demand, then cardiac efficiency is improved, but device complexity increases
Solution Approach 1:
The patent utilizes a single implantable cardiac rhythm management device that performs multiple functions: it detects activity level, determines posture, tracks circadian rhythms, and delivers adaptive pacing therapy. By consolidating these multiple functions into one universal device, the system achieves improved cardiac efficiency through adaptive pacing while minimizing the increase in device complexity that would result from requiring separate devices for each function.
Data Source
AI summary
Pacing parameters may be adjusted to increase the cardiac output of a patient's heart while a patient is awake and/or active and the demand placed on the heart may be greatest, and to decrease or hemodynamic efficiency while a patient is at rest so that the heart itself has time to rest before the next period of higher demand for efficiency begins. This may aid in lessening the strain placed on the heart by making the heart work hard when needed such as when the patient is active, and by permitting the heart to “rest” when the patient is relatively inactive.