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Continuous thermodilution cardiac output measurement in sheep
M Yelderman1, M D Quinn, R C McKown
1InterFlo Medical, Inc., Plano, Tex. 75074.
The Journal of Thoracic and Cardiovascular Surgery
|August 1, 1992
Summary
A novel continuous cardiac output measurement technique using thermodilution principles was developed. This method accurately calculates cardiac output, showing high correlation with traditional bolus thermodilution.
Area of Science:
- Cardiovascular physiology
- Medical instrumentation
Background:
- Accurate cardiac output monitoring is crucial for clinical decision-making.
- Traditional thermodilution methods often provide intermittent measurements.
Purpose of the Study:
- To develop and validate a continuous cardiac output measurement technique.
- To assess the accuracy of the new method against bolus thermodilution.
Main Methods:
- Modified pulmonary artery catheters with an integrated filament for heat infusion.
- Continuous heat waveform infusion using a random binary sequence.
- Cross-correlation analysis of distal blood temperature and heat waveform to generate dilution curves.
Main Results:
- The new thermodilution technique demonstrated a strong linear correlation (R=0.97, p<0.0001) with bolus thermodilution.
- Cardiac output measurements ranged from 1.5 to 13.2 L/min in sheep.
- The regression equation was y = 1.00x + 0.13, indicating excellent agreement.
Conclusions:
- Continuous thermodilution offers a reliable and accurate method for measuring cardiac output.
- This technique has potential for improved hemodynamic monitoring in critical care settings.