Ventricular Filling Phase Slope for PCWP and Cardiac Index Monitoring
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Solution Overview
Problem
Current ventricular assist devices (VADs) lack effective methods to monitor and predict elevated pulmonary capillary wedge pressure and cardiac index, which are critical for assessing heart performance and potential complications.
Innovation Solution
A computer-readable medium and controller system that determines the ventricular filling phase slope from blood flow rate data, comparing it to predetermined thresholds to trigger warnings for elevated pulmonary capillary wedge pressure and low cardiac index, utilizing a processor and computer-readable medium to execute instructions for identifying these conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If flow waveforms are used to evaluate VAD properties and performance, then device monitoring capability is improved, but the ability to predict elevated pulmonary capillary wedge pressure and cardiac index remains insufficient
Solution Approach 1:
The flow waveform is segmented into distinct phases (ventricular filling phase, ejection phase, etc.) based on flow rate thresholds and timing. By isolating the ventricular filling phase segment, the system can specifically analyze the slope during this critical period to predict PCWP and cardiac index, transforming a general waveform analysis into a targeted diagnostic tool.
Solution Approach 2:
The system extracts the ventricular filling phase slope as a new diagnostic parameter from the flow waveform data. This parameter represents the rate of change of flow during ventricular filling and serves as an indicator for elevated PCWP and low cardiac index. By introducing this derived parameter, the system enhances prediction accuracy beyond basic flow rate monitoring.
2Reliability
If the system triggers warnings based on slope threshold comparisons, then early detection of high PCWP and low cardiac index is achieved, but false alarms may increase
Solution Approach 1:
The system continuously monitors the ventricular filling phase slope and compares it against predetermined thresholds in real-time. When the slope exceeds the threshold, a warning is triggered. This feedback mechanism enables continuous assessment and timely detection of abnormal conditions while maintaining a clear decision rule (threshold comparison) that reduces arbitrary false alarms.
Solution Approach 2:
The system establishes predetermined thresholds for the ventricular filling phase slope before clinical use. These thresholds are set based on expected normal ranges and statistical analysis, allowing the system to proactively detect deviations from normal physiology before they progress to critical conditions, thereby enabling early intervention.
Data Source
AI summary
A controller is provided to determine a ventricular filling phase slope as an indicator of high pulmonary capillary wedge pressure and/or cardiac index. Flow rate values describing a blood flow rate through a ventricular assist device are received. A ventricular filling phase segment is identified from a portion of the received flow rate values. A slope of the received flow rate values during the identified ventricular filling phase segment is determined. The determined slope is compared to a predetermined threshold value. When the determined slope exceeds the predetermined threshold value based on the comparison, a warning is triggered regarding an elevated pulmonary capillary wedge pressure or a low cardiac index value.