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Estimation of stroke volume changes by ultrasonic doppler
Circulation
|December 1, 1977
Summary
Continuous-wave Doppler accurately estimates stroke volume changes by measuring aortic blood velocity. This non-invasive technique shows a direct proportion between systolic velocity integral and stroke volume over a wide range.
Area of Science:
- Cardiovascular Physiology
- Medical Imaging and Diagnostics
Background:
- Accurate stroke volume estimation is crucial for assessing cardiac function.
- Non-invasive methods are preferred for continuous patient monitoring.
Purpose of the Study:
- To evaluate the accuracy of continuous-wave Doppler for estimating stroke volume changes.
- To determine the relationship between aortic blood velocity and stroke volume.
Main Methods:
- Continuous-wave Doppler recordings of aortic blood velocity in anesthetized dogs.
- Cardiac output manipulation via fluid infusion and exsanguination.
- Simultaneous measurement of Doppler-derived systolic velocity integral (SVI) and thermodilution cardiac output.
Main Results:
- A strong correlation (0.95 +/- 0.04 SD) was found between SVI and stroke volume.
- The relationship was linear and consistent across a six-fold range of cardiac output.
- The technique demonstrated high accuracy with a low standard error of fit (0.29 +/- 0.03 cm).
Conclusions:
- Continuous-wave Doppler provides an accurate, non-invasive method for estimating stroke volume variations.
- The systolic velocity integral is a reliable indicator of stroke volume changes in cardiovascular assessments.