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Cardiac output by transesophageal echocardiography using continuous-wave Doppler across the aortic valve
P L Darmon1, Z Hillel, A Mogtader
1Department of Anesthesiology, St. Luke's-Roosevelt Hospital Center, College of Physicians and Surgeons, Columbia University, New York, New York 10025.
Anesthesiology
|April 1, 1994
Summary
Transesophageal echocardiography with continuous-wave Doppler accurately determines cardiac output (CO) by measuring aortic blood flow velocity. This method shows high correlation and agreement with traditional thermodilution CO measurements.
Area of Science:
- Cardiology
- Medical Imaging
- Hemodynamics
Background:
- Transesophageal echocardiography (TEE) for cardiac output (CO) determination has been limited.
- Assessing the capability of aortic continuous-wave Doppler TEE to determine CO (DCO) in a transgastric view.
Purpose of the Study:
- To compare DCO derived from TEE with thermodilution CO (TCO).
- To evaluate the accuracy and reliability of DCO measurement in cardiac surgery patients.
Main Methods:
- DCO determination in 63 cardiac surgery patients using transgastric TEE.
- Calculation of stroke volume via aortic valve area and velocity-time integral.
- CO calculation by multiplying stroke volume by heart rate.
Main Results:
- High correlation (r=0.94) and agreement between DCO and TCO.
- Mean DCO: 4.35 ± 1.18 L/min; Mean TCO: 4.41 ± 1.17 L/min.
- Accurate tracking of CO changes (>10%) with DCO compared to TCO.
Conclusions:
- Continuous-wave Doppler TEE provides accurate CO determination.
- This method offers a reliable alternative to thermodilution for CO monitoring.