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Transgastric continuous-wave Doppler to determine cardiac output
W E Katz1, T A Gasior, J J Quinlan
1Department of Medicine, University of Pittsburgh Medical Center, Pennsylvania 15213.
The American Journal of Cardiology
|April 1, 1993
Summary
A novel transgastric continuous-wave Doppler method accurately measures cardiac output in cardiac surgery patients. This technique shows strong correlation with the established thermodilution method, offering a promising alternative for cardiac output monitoring.
Area of Science:
- Cardiovascular Physiology
- Medical Imaging
- Surgical Monitoring
Background:
- Accurate cardiac output (CO) measurement is crucial for managing critically ill patients, especially during cardiac surgery.
- Traditional methods like thermodilution have limitations.
- Non-invasive or minimally invasive techniques are sought for continuous CO monitoring.
Purpose of the Study:
- To evaluate a new transgastric continuous-wave Doppler (TG-CW Doppler) method for measuring cardiac output.
- To compare TG-CW Doppler measurements with simultaneous thermodilution measurements in cardiac surgery patients.
Main Methods:
- Utilized a 5 MHz transesophageal transducer for imaging and Doppler measurements.
- Calculated stroke volume using Doppler flow velocity integral and aortic annulus area.
- Acquired CO by multiplying stroke volume by heart rate.
- Compared TG-CW Doppler data with simultaneous thermodilution data in 50 adequate studies.
Main Results:
- Achieved 88% technical success rate (50 out of 57 attempts).
- Demonstrated a close correlation between TG-CW Doppler and thermodilution methods (R = 0.91, SEE = 0.8 L/min, p < 0.001).
- The regression equation was y = 1.01x + 0.2, indicating good agreement.
Conclusions:
- Transgastric continuous-wave Doppler is a promising technique for accurate cardiac output measurement.
- This method may be suitable for selected patients undergoing cardiac surgery.
- Further validation in larger patient cohorts is warranted.