Blood Pressure Measurement Reliability Assessment via Physiological Stress Indicators
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Solution Overview
Problem
Current blood pressure measurement methods struggle to differentiate between long-term hypertension and temporary increases caused by pain or anxiety, leading to overdiagnosis and inappropriate pharmacological interventions.
Innovation Solution
A method and apparatus that assess the reliability of blood pressure measurements by obtaining physiological characteristic measurements before and after the blood pressure measurement, using indicators such as heart rate variability and skin conductance to determine if the measurement was affected by stress or pain, and repeating the process until a reliable reading is obtained.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If blood pressure measurement is performed using conventional methods, then the measurement process is simple and quick, but the measurement reliability is low due to undetected stress or pain effects
Solution Approach 1:
The system performs preliminary measurements of physiological characteristics (such as heart rate variability, skin conductance, or respiratory rate) before the blood pressure measurement to establish a baseline state. This allows detection of stress or pain conditions that would invalidate the subsequent blood pressure reading, enabling the system to reject unreliable measurements before they are taken.
Solution Approach 2:
The system measures physiological characteristics both before and after the blood pressure measurement, then compares these measurements to determine whether the subject's state changed during the measurement process. If the physiological indicators suggest stress or pain was present, the system provides feedback to reject the blood pressure reading as unreliable, ensuring only valid measurements are accepted.
2Reliability
If multiple blood pressure measurements are repeated to ensure accuracy, then the measurement reliability improves, but the measurement time and subject discomfort increase
Solution Approach 1:
By performing preliminary physiological characteristic measurements before each blood pressure measurement, the system can predict whether a measurement will be reliable in advance. This allows the system to skip taking the blood pressure measurement altogether if the physiological indicators suggest it would be unreliable, saving time and reducing subject discomfort while maintaining high reliability.
Solution Approach 2:
The system uses feedback from physiological characteristic measurements to dynamically determine whether to proceed with or repeat the blood pressure measurement. This intelligent decision-making process avoids unnecessary repeated measurements when the first measurement is likely to be reliable, thereby reducing measurement time while ensuring reliability through physiological validation.
3Measurement precision
If physiological characteristic measurements are taken before and after blood pressure measurement, then the ability to detect stress or pain effects improves, but the device complexity and measurement procedure increase
Solution Approach 1:
The system uses a single measurement apparatus that can perform multiple functions: measuring both blood pressure and physiological characteristics (such as heart rate variability, skin conductance, or respiratory rate). This multi-functional approach allows the system to detect stress or pain effects using the same device already present for blood pressure measurement, avoiding the need for separate specialized equipment and thereby limiting the increase in device complexity.
Solution Approach 2:
The system uses physiological characteristics as intermediary indicators to indirectly detect the presence of stress or pain effects that would affect blood pressure measurements. Rather than directly measuring stress or pain, the system measures readily obtainable physiological parameters that correlate with these states, providing a practical and minimally complex method for validating measurement reliability.
Data Source
AI summary
There is provided a method of assessing the reliability of a measurement of blood pressure of a subject, the method in a control unit of an apparatus comprising obtaining a first measurement of at least one physiological characteristic of the subject that is indicative of the level of pain and/or stress of the subject, wherein the first measurement is made prior to a measurement of blood pressure being made; obtaining the measurement of blood pressure of the subject; obtaining a second measurement of the at least one physiological characteristic of the subject, wherein the second measurement is made after the measurement of blood pressure is made and prior to a subsequent measurement of blood pressure being made; and determining if the measurement of blood pressure is reliable based on the first measurement and the second measurement, wherein the measurement of blood pressure is determined to be reliable if the first measurement and the second measurement indicate a low level of pain and/or stress. A corresponding apparatus that implements the method is also provided.