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Assessment of stroke volume and cardiac output by Doppler echocardiography
P Niederle1, A Stárek, V Jezek
1Institute of Physiological Regulations, Czechoslovak Academy of Sciences, Prague.
Insights
Doppler ultrasound accurately measures stroke volume and cardiac output, correlating closely with traditional hemodynamic methods. This non-invasive technique is a reliable alternative for assessing cardiac function in patients with good echo Doppler recordings.
Area of Science:
- Cardiovascular Physiology
- Medical Imaging
- Diagnostic Ultrasound
Background:
- Accurate measurement of stroke volume and cardiac output is crucial for assessing cardiovascular function.
- Traditional methods like Fick's principle and thermodilution are invasive or have limitations.
- Non-invasive techniques are sought for routine clinical assessment.
Purpose of the Study:
- To evaluate the accuracy and reliability of pulse and continuous-wave Doppler ultrasound for measuring stroke volume and cardiac output.
- To compare Doppler-derived hemodynamic values with those obtained using Fick's principle of thermodilution.
Main Methods:
- Utilized pulse and continuous-wave Doppler technique for 51 measurements in 37 individuals.
- Compared Doppler results with simultaneous or immediately subsequent measurements using Fick's principle of thermodilution.
- Performed regression analysis and paired t-tests to assess correlation and agreement.
Main Results:
- Demonstrated a close correlation between Doppler and hemodynamic values (r=0.86 for stroke volume, r=0.94 for cardiac output; p<0.001).
- Paired t-test showed no significant difference between Doppler and reference methods.
- Standard deviation of Doppler stroke volume was 10%, with only two measurements differing by over 25%.
Conclusions:
- Doppler ultrasound is a highly accurate and reliable non-invasive method for determining stroke volume and cardiac output.
- It shows excellent agreement with established hemodynamic assessment techniques.
- Recommended as an alternative method for cardiac output determination in patients with high-quality echo Doppler recordings.
Abstract:
The authors used the pulse and continuous-wave Doppler technique to perform 51 measurements of stroke volume and cardiac output in 37 persons. Results were compared with those obtained using Fick's principle of thermodilution (immediately subsequent or simultaneous). Regression analysis showed a close correlation between Doppler and haemodynamic values - r = 0.86 for stroke volume and 0.94 for cardiac output (p less than 0.001). Using the paired t-test, the methods did not differ significantly. Standard deviation of Doppler stroke volume values from reference haemodynamic values was 10%, and only two measurements differed by more than 25%. Doppler determination of cardiac output can be therefore recommended as an alternative method in patients with high-quality echo Doppler recordings.