Cardiac Pumping Evaluation Using Pulse Oximeter Waveform Derivatives
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Solution Overview
Problem
Existing methods for assessing cardiac pumping function during surgical procedures are inadequate for timely detection of changes in heart muscle function, necessitating immediate corrective actions, as they rely on static measurements rather than dynamic waveform analysis.
Innovation Solution
An electronic device that monitors and calculates the second derivative of pulse oximeter waveforms to assess cardiac pumping function, providing real-time evaluation of heart muscle function through dynamic changes in blood pulse waveforms, enabling early detection of trends in cardiac performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If static measurements are used to assess cardiac pumping function, then the assessment method is simple, but the detection timeliness and accuracy of changes in heart muscle function are insufficient
Solution Approach 1:
The patent transitions from static measurements to dynamic waveform analysis by continuously monitoring pulse oximeter waveforms and calculating their derivatives. This dynamic approach enables real-time detection of cardiac function changes, resolving the contradiction between measurement precision and device complexity through continuous monitoring rather than intermittent static measurements.
Solution Approach 2:
The patent introduces new parameters (first derivative dA/dt and second derivative d2A/dt2 of the pulse waveform) to enhance detection capability. By analyzing these derivative parameters alongside the original waveform, the system achieves superior detection accuracy for cardiac function changes while maintaining a relatively simple implementation based on standard pulse oximetry technology.
2Loss of time
If continuous dynamic waveform analysis is performed, then early detection of cardiac function trends is achieved, but computational requirements and processing time increase
Solution Approach 1:
The patent segments the waveform analysis into distinct derivative levels (first derivative for velocity, second derivative for acceleration). This segmentation allows the system to process and interpret specific aspects of cardiac function separately, reducing the computational burden compared to analyzing the entire waveform comprehensively while maintaining early detection capability.
Solution Approach 2:
The patent applies partial action by focusing computational resources on calculating only the necessary derivatives (first and second) rather than performing complete waveform characterization. This selective approach achieves timely detection of cardiac trends with reduced computational requirements compared to full waveform analysis.
3Measurement precision
If maximum second derivative values are compared across successive waveforms, then cardiac pumping function evaluation is improved, but the complexity of data processing increases
Solution Approach 1:
The patent extracts the maximum second derivative value from each pulse waveform as a key feature for cardiac function evaluation. By isolating this specific parameter from the complete waveform data, the system achieves precise evaluation of cardiac pumping function while simplifying data processing compared to analyzing entire waveforms or multiple parameters simultaneously.
Data Source
AI summary
An electronic device that evaluates a cardiac pumping function is described. This electronic device may perform the operations of: monitoring an instance of a pulse oximeter waveform of an individual; computing metric information associated with the instance of the pulse oximeter waveform; and calculating a rate of rise or fall of the instance of the pulse oximeter waveform as a function of time. In some embodiments, the electronic device may provide a recommended remedial action based at least in part on the calculated rate or rise of fall in the instance of the pulse oximeter waveform.