Orthostatic Response Assessment Using Dicrotic Notch Pulse Analysis
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Solution Overview
Problem
Current methods for evaluating orthostatic response are costly and require sophisticated hardware or trained experts, limiting accessibility and efficiency.
Innovation Solution
A method utilizing pulse signal analysis to identify dicrotic notch positions and amplitudes, generating an orthostatic response curve, and assigning a numerical score based on heart rate and blood pressure changes, enabling assessment of orthostatic response without expensive equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional methods using arterial pressure cuffs or tilt tables are used to evaluate orthostatic response, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent replaces complex mechanical measurement systems (arterial pressure cuffs, tilt tables) with optical sensing technology. A photoplethysmogram (PPG) sensor optically detects pulse waveforms from the skin surface, eliminating the need for invasive mechanical pressure measurement devices while maintaining orthostatic response evaluation capability through analysis of pulse signal characteristics.
Solution Approach 2:
The patent uses optical copying of physiological information by detecting pulse waveforms through light absorption changes in the skin. Instead of directly measuring arterial pressure mechanically, the system creates an optical copy of the pulse signal that contains sufficient information to derive orthostatic response parameters through signal processing.
2Measurement precision
If arterial pressure readings are taken during orthostatic testing, then measurement precision is improved, but ease of operation deteriorates due to requiring trained experts
Solution Approach 1:
The system performs self-service by automatically analyzing pulse signal characteristics to determine orthostatic response. The processing unit automatically identifies dicrotic notches, calculates timing parameters, and generates assessments without requiring expert intervention. This automation makes the device easy to operate while maintaining measurement precision through algorithmic analysis of the PPG signal.
Solution Approach 2:
The patent replaces the need for trained operators to interpret complex arterial pressure readings with automated digital signal processing. The system substitutes human expert analysis with algorithmic processing of pulse waveform characteristics, specifically analyzing dicrotic notch timing and morphology to objectively determine orthostatic response status.
3Measurement precision
If multiple blood pressure readings and heart rate measurements are taken during tilt table testing, then measurement precision is improved, but loss of time increases due to test duration of 5 to 45 minutes
Solution Approach 1:
The patent implements continuous monitoring of pulse signals throughout the orthostatic challenge, continuously capturing PPG waveforms during position changes. This continuous data collection allows for real-time analysis of orthostatic response without requiring multiple discrete measurement interruptions, thereby reducing overall test duration while maintaining assessment precision through ongoing waveform analysis.
Solution Approach 2:
The system substitutes time-consuming manual blood pressure measurements with rapid optical pulse signal acquisition and automated processing. The PPG sensor continuously captures pulse waveforms at high frequency, and the processing unit rapidly analyzes dicrotic notch characteristics to immediately determine orthostatic response status, significantly reducing the time required compared to conventional intermittent blood pressure monitoring.
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
Enables cost-effective, non-invasive evaluation of orthostatic response, allowing identification of individuals with poor tolerance to standing, facilitating timely interventions and lifestyle adjustments.
Implementation Method 1
receiving a pulse signal obtained during the orthostatic test performed from a sensor placed on the individual
Data Source
AI summary
Methods, devices and systems are described for evaluating an initial orthostatic response of an individual during an orthostatic test. For example, the method may include: receiving a pulse signal obtained during an orthostatic test performed from a sensor placed on the individual; identifying a position and an amplitude of the dicrotic notch for pulses in a portion of the pulse signal to obtain a set of dicrotic notch positions and amplitudes; generating an initial orthostatic response curve from the set of dicrotic notch positions and amplitudes; evaluating the initial orthostatic response curve to obtain an assessment of the initial orthostatic response; and displaying, storing and/or transmitting at least one of the initial orthostatic response curve and a visual representation of the assessment of the initial orthostatic response curve.