Implantable Device Guiding Heart Failure Therapy via Fluid Status Monitoring
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Solution Overview
Problem
Current therapies for acute decompensated heart failure (ADHF) face challenges in determining optimal fluid volume status and dosage of intravenous diuretics or vasodilators, leading to risks of overdiuresis and inadequate fluid removal, which can burden compromised kidneys and fail to achieve desired symptom relief.
Innovation Solution
An implantable medical device (IMD) capable of monitoring physiological signals such as transthoracic impedance and intracardiac pressure to derive fluid status measurements, guiding the delivery of ADHF therapy by setting and adjusting dosages to maintain a targeted optivolemic level, thereby preventing overdiuresis and ensuring effective symptom management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If intravenous infusion of diuretics or vasodilators is delivered at high dosage or for long duration, then fluid removal effectiveness is improved, but overdiuresis occurs causing harmful effects
Solution Approach 1:
The system continuously monitors fluid status measurements (such as intrathoracic impedance, intracardiac pressure, or renal function markers) and uses this feedback to dynamically adjust the dosage and duration of intravenous diuretic or vasodilator infusion. This closed-loop control enables precise titration of fluid removal therapy, maximizing effectiveness while preventing overdiuresis by automatically reducing or stopping infusion when target fluid status is achieved or exceeded.
2Productivity
If fluid is removed too rapidly or in excessive amounts, then symptom relief is improved, but kidney burden increases due to renal insufficiency
Solution Approach 1:
The system dynamically adjusts the fluid removal rate based on real-time monitoring of fluid status measurements and patient response. Rather than using fixed high-rate diuresis protocols, the infusion rate is continuously modified to match the patient's actual fluid accumulation rate and renal handling capacity, enabling rapid symptom relief when needed while automatically slowing down when renal function suggests reduced tolerance, thereby minimizing kidney burden.
3Object-affected harmful factors
If fluid removal is insufficient, then kidney burden is reduced, but desired symptom relief is not achieved
Solution Approach 1:
The system uses continuous monitoring of fluid status measurements to determine when adequate fluid removal has been achieved. When measurements indicate that target fluid status is reached or exceeded, the system automatically reduces or stops diuretic/vasodilator infusion, preventing both overdiuresis and excessive kidney burden. This feedback-driven approach ensures symptom relief adequacy by maintaining infusion until therapeutic goals are met.
4Reliability
If there is lag time between optimal fluid volume status and symptom alleviation, then therapy safety is improved, but therapy control precision deteriorates
Solution Approach 1:
The system monitors fluid status measurements continuously and identifies trends indicating approaching optimal fluid volume status before overt symptoms manifest. By detecting early changes in fluid status (such as gradual impedance changes or pressure trends), the system can anticipate the need to adjust therapy parameters in advance, maintaining precise control throughout the therapy course and avoiding both under- and over-treatment during the lag period between volume correction and symptom resolution.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The IMD enables precise control of ADHF therapy, reducing the risk of overdiuresis and ensuring stable fluid status, thereby improving patient outcomes by maintaining optimal fluid volume and reducing hospitalization burdens.
Implementation Method 1
An implantable medical device (IMD) capable of monitoring physiological signals such as transthoracic impedance and intracardiac pressure to derive fluid status measurements
Implementation Method 2
An implantable medical device (IMD) capable of monitoring physiological signals such as transthoracic impedance and intracardiac pressure to derive fluid status measurements
Data Source
AI summary
An implantable medical device system and associated method for use in guiding an acute decompensated heart failure therapy set an optimal fluid status measurement level. A physiological sensor signal sensed by an implantable medical device is used to compute the fluid status measurement. A target rate of change of the fluid status measurement is computed for guiding the therapy.