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Continuous stroke volume estimation from aortic pressure using zero dimensional cardiovascular model: proof of
Shun Kamoi1, Christopher Pretty1, Paul Docherty1
1Department of Mechanical Engineering, University of Canterbury, Christchurch, New Zealand.
Plos One
|July 18, 2014
Summary
Accurate stroke volume (SV) estimation is crucial for patient monitoring. This study shows SV can be reliably estimated from aortic pressure waveforms using a Windkessel model, simplifying hemodynamic assessment.
Area of Science:
- Cardiovascular Physiology
- Biomedical Engineering
- Hemodynamic Monitoring
Background:
- Accurate, continuous left ventricular stroke volume (SV) measurement is vital for assessing patient hemodynamic status and treatment response.
- Current direct SV measurement methods are invasive, and estimation techniques often require specialized equipment and approximations.
Purpose of the Study:
- To investigate the accuracy of a three-element Windkessel model combined with aortic pressure waveform analysis for estimating beat-to-beat SV.
- To develop a method for SV estimation requiring only one known element value from the Windkessel model.
Main Methods:
- Utilized a three-element Windkessel model to analyze aortic pressure waveforms, separating components for resistance/compliance and characteristic impedance.
- Estimated beat-to-beat SV using population-representative optimal values for model elements.
- Validated the method against simultaneously measured ventricular volume and aortic pressure data in porcine models.
Main Results:
- The median difference between measured and estimated SV was 0.6 ml, with a 90% range of -12.4 ml to 14.3 ml.
- Cross-correlations between estimated and measured SV exceeded R=0.65 during induced SV changes.
- Demonstrated accurate estimation of SV magnitude and trends from pressure waveforms alone.
Conclusions:
- The presented method accurately estimates stroke volume (SV) magnitude and trends using only pressure waveforms.
- This approach obviates the need for complex physiological metrics, offering a simpler, non-invasive method for hemodynamic assessment.
