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Continuous cardiac output determination using transtracheal Doppler: initial results in humans
J H Abrams1, R E Weber, K D Holmen
1Department of Surgery, University of Minnesota, Minneapolis.
Anesthesiology
|July 1, 1989
Summary
This study introduces a novel transtracheal Doppler system for estimating cardiac output in intubated patients. Initial human trials show promising correlation with established thermodilution methods, offering a new non-invasive monitoring tool.
Area of Science:
- Cardiovascular physiology
- Medical instrumentation
- Critical care medicine
Background:
- Cardiac output monitoring is crucial in critical care.
- Existing methods like thermodilution have limitations.
- Transtracheal Doppler offers a potential non-invasive alternative.
Purpose of the Study:
- To evaluate the initial results of a transtracheal Doppler system in humans.
- To assess the accuracy of this novel method for cardiac output estimation.
- To establish the correlation between transtracheal Doppler and thermodilution.
Main Methods:
- Development and calibration of a transtracheal Doppler probe integrated into an endotracheal tube.
- Empirical determination of the ultrasound beam angle (phi) for optimal aortic diameter calibration (22-37 mm).
- Comparison of cardiac output measurements with thermodilution in human patients (2.69-8.62 L/min).
Main Results:
- Successful calibration of the transtracheal Doppler system in humans.
- Good correlation (R² = 0.835) observed between transtracheal Doppler and thermodilution cardiac outputs.
- The system demonstrated reliable performance across a range of cardiac outputs.
Conclusions:
- Transtracheal Doppler is a feasible method for estimating cardiac output in intubated patients.
- This technique shows good agreement with thermodilution, suggesting clinical utility.
- Further validation may establish transtracheal Doppler as a valuable bedside monitoring tool.