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Stroke volume measured by pulsed ultrasound Doppler and M-mode echocardiography
Insights
This study shows ultrasound Doppler and echocardiography can non-invasively measure blood flow and cardiac output. These methods provide a reliable alternative for assessing stroke volume in patients.
Area of Science:
- Cardiovascular physiology
- Medical imaging technologies
Background:
- Accurate measurement of stroke volume and cardiac output is crucial for patient management.
- Invasive methods like the Swan-Ganz catheter and thermodilution technique are commonly used but carry risks.
Purpose of the Study:
- To evaluate the non-invasive capability of combined pulsed ultrasound Doppler and M-mode echocardiography for measuring stroke volume.
- To compare non-invasively derived stroke volumes with those obtained via the invasive thermodilution technique.
Main Methods:
- Pulsed ultrasound Doppler was used to measure ascending aorta blood flow velocity.
- M-mode echocardiography determined aortic diameter.
- Stroke volumes were calculated using Doppler-echocardiography data in six patients.
- Simultaneous measurements were compared with the thermodilution method.
Main Results:
- A good correlation (r = 0.08) was observed between stroke volumes calculated by the Doppler-Echo method and the thermodilution technique.
- Forty-three paired measurements were performed.
Conclusions:
- Non-invasive measurement of stroke volume and cardiac output is feasible using ultrasound Doppler and echocardiography.
- This combined ultrasound approach offers a promising non-invasive alternative for hemodynamic assessment.
Abstract:
The velocity of the bloodstream in the ascending aorta was measured by pulsed ultrasound Doppler. The diameter of the aorta was measured by M-mode echocardiography. Forty-three measurements were performed in six patients, who all had a Swan-Ganz catheter. The calculated stroke volumes from the Doppler-Echo method were compared with the stroke volumes measured by the thermodilution technique, which was performed simultaneously with the Doppler measurements. The correlation between the measurements was good (r = 0.08). It is concluded that it is possible non-invasively to measure stroke volume (and cardiac output) by means of ultrasound Doppler and an echocardiograph.