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Noninvasive estimation of cardiac output
W Welkowitz1, Q Cui, Y Qi
1Department of Biomedical Engineering, Rutgers University, Piscataway, NJ 08855.
IEEE Transactions on Bio-Medical Engineering
|November 1, 1991
Summary
A new noninvasive method accurately measures cardiac output using pulse waveforms from the aorta. This technique shows promise for both animal and human studies, offering an alternative to invasive measurements.
Area of Science:
- Cardiovascular Physiology
- Biomedical Engineering
- Medical Devices
Background:
- Accurate cardiac output (CO) measurement is crucial for diagnosing and managing cardiovascular diseases.
- Current CO measurement methods often involve invasive procedures with associated risks.
- There is a need for reliable, noninvasive CO monitoring techniques.
Purpose of the Study:
- To describe and validate a novel noninvasive method for measuring cardiac output.
- To assess the accuracy of this method in animal models and preliminary human studies.
Main Methods:
- The method employs adaptive aorta models combined with pulse contour analysis of femoral and carotid artery waveforms.
- Validation in dogs involved comparing calculated aortic flow with electromagnetic flow measurements and internal pressure recordings.
- Preliminary human validation utilized external pulse measurements against standard thermal dilution CO measurements.
Main Results:
- The noninvasive method demonstrated comparable results to invasive electromagnetic flow measurements in canine studies.
- Preliminary patient data showed good agreement between the novel method and thermal dilution measurements.
- The technique utilizes readily obtainable pulse contour data for CO estimation.
Conclusions:
- The described noninvasive method shows potential for accurate cardiac output determination.
- Further validation in larger patient cohorts is warranted to establish its clinical utility.
- This approach may offer a safer and more accessible alternative for CO monitoring.