Related Experiment Videos
Non-invasive Doppler-derived cardiac output: a validation study comparing this technique with thermodilution and Fick
J N Davies1, D R Allen, A D Chant
1Vascular Surgical Unit, Royal South Hampshire Hospital, Southampton, U.K.
European Journal of Vascular Surgery
|October 1, 1991
Summary
Non-invasive Doppler cardiac output measurement shows promise for assessing cardiac risk in vascular surgery patients. This technique offers a practical alternative to invasive methods for identifying high-risk individuals.
Area of Science:
- Cardiovascular Physiology
- Medical Technology Assessment
- Vascular Surgery
Background:
- Cardiac events pose significant risks in vascular surgery patients.
- Current risk prediction methods like coronary angiography are invasive and impractical.
- A non-invasive method for measuring cardiac output and stratifying cardiac risk is needed.
Purpose of the Study:
- To validate a Doppler-derived cardiac output monitor (ACCUCOM 2) against established methods.
- To assess the utility of Doppler cardiac output in high-risk vascular surgery patients.
Main Methods:
- Prospective study comparing Doppler cardiac output with thermodilution and Fick methods.
- Measurements taken in 12 patients undergoing elective coronary angiography.
- Statistical analysis using linear regression and Bland-Altman methods.
Main Results:
- Doppler cardiac output correlated well with thermodilution (r=0.81, p<0.002) and Fick method (r=0.76, p<0.02).
- Differences between Doppler and thermodilution were normally distributed.
- Mean difference was 0.32 l/min (SD 0.48 l/min).
Conclusions:
- Doppler-derived cardiac output is a valid and comparable method to traditional techniques.
- This non-invasive technique may be valuable for assessing and monitoring cardiac risk in vascular surgery patients.