Venous-to-Arterial Blood Gas Conversion Without SpO2
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Solution Overview
Problem
Current methods for converting venous blood gas values to arterial blood gas values require a measured or estimated arterial oxygenation saturation value (SpO2), which can lead to measurement errors and complications, and are not suitable for non-specialized wards where arterial samples are not routinely taken.
Innovation Solution
A computer-implemented method that provides a predefined default arterial oxygenation saturation value as a substitute, optionally adjusted by user input, and applies a mathematical model to venous blood gas values to estimate arterial blood gas values without requiring SpO2, using a mathematical model like the v-TAC algorithm.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a measured or estimated arterial oxygenation saturation value (SpO2) is required for converting venous blood gas values to arterial blood gas values, then the conversion accuracy is improved, but the device complexity and ease of operation deteriorate due to additional measurement requirements and potential measurement errors
Solution Approach 1:
The patent extracts the essential conversion function from the complex SpO2 measurement requirement. By using a predefined default SpO2 value instead of requiring actual measurement, the system removes the need for additional measurement devices and procedures while maintaining the core conversion capability through the mathematical model
Solution Approach 2:
The patent uses a simple predefined default value (a static number) instead of requiring complex ongoing SpO2 measurements. This disposable-like approach uses a straightforward substitute value that can be applied without ongoing measurement infrastructure, reducing device complexity while enabling the conversion function
2Measurement precision
If arterial blood samples are taken to obtain accurate arterial blood gas values, then the measurement precision is improved, but the ease of operation and patient comfort deteriorate due to invasive procedures and potential complications
Solution Approach 1:
The patent creates a mathematical copy of arterial blood gas values from venous blood gas measurements. Instead of physically obtaining arterial samples through invasive procedures, the system uses a mathematical model to calculate and generate arterial blood gas values based on the easier-to-obtain venous samples, eliminating the need for difficult arterial punctures
Solution Approach 2:
The patent introduces a mathematical model as an intermediary between venous blood gas measurements and arterial blood gas values. This intermediary processing layer allows conversion from the easily obtainable venous samples to the clinically relevant arterial values without requiring direct arterial sampling, thus improving ease of operation while maintaining measurement utility
3Measurement precision
If SpO2 measurement is performed to improve conversion accuracy, then the measurement precision is improved, but the loss of time and productivity deteriorate due to additional measurement steps and potential measurement errors requiring correction
Solution Approach 1:
The patent applies preliminary action by using a predefined default SpO2 value that is established beforehand and does not require real-time measurement. This pre-established substitute value can be immediately applied in the mathematical model without waiting for SpO2 measurements, eliminating measurement time while maintaining conversion functionality
Data Source
AI summary
A computer-implemented method, system and decision support system adapted to provide arterial venous blood gas values without the provision of an arterial oxygenation saturation value or arterial blood gas values. The method comprises the provision of arterial blood gas values from a subject, for which said subject, only venous blood gas values are provided, by providing a mathematical model adapted to convert said venous blood gas values with a provided predefined default arterial oxygenation value to output arterial blood gas values of said subject. The present invention thus provides a method for providing arterial blood gas values from a specific subject without the need of providing an arterial blood sample from a painful arterial blood draw or the need for an arterial oxygenation saturation value of the subject, thus reducing distress to said patient and a reduction of tasks to relevant health care personnel.