Use of Ultrasound to Measure Left Ventricular Stroke Volume
Why the study?
Does ultrasound accurately measure left ventricular stroke volume compared to the direct Fick method in patients with competent mitral and aortic valves?
Population
16 patients proven to have competent mitral and aortic valves
Comparison
Ultrasound examination to measure left… vs Direct Fick method for cardiac output…
Design
Cross-sectional
Authors
Discussion
Loading...
Member takes
Implication
May support ultrasound as bedside alternative for LV stroke volume; leaves open prospective validation in broader populations.
Key Points
- To validate whether bedside ultrasound measurements can accurately quantify left ventricular stroke volume compared to the standard direct Fick method.
- Conducted simultaneous ultrasound examinations and direct Fick cardiac output determinations in 16 patients with confirmed competent mitral and aortic valves.
- Estimated stroke volume using the product of the mitral ring echo amplitude (MREa) and the distance between the anterior and posterior left ventricular wall echoes (LVD).
- Ultrasound measurements correlated strongly with stroke volume determinations obtained via the direct Fick method (r = 0.973; P < 0.001).
- Regression-predicted ultrasound stroke volumes were within 11 ml or 15% of direct Fick measurements.
Structured PICO
Does ultrasound accurately measure left ventricular stroke volume compared to the direct Fick method in patients with competent mitral and aortic valves?
P
Population
16 patients proven to have competent mitral and aortic valves
I
Intervention
Ultrasound examination to measure left ventricular stroke volume (using amplitude of echo from left ventricle near mitral ring times distance between anterior and posterior ventricular walls)
C
Comparator
Direct Fick method for cardiac output determination
O
Outcome
Correlation between ultrasound and direct Fick method for measuring left ventricular stroke volumesurrogate
Ultrasound provides a simple, harmless, and accurate bedside method for measuring left ventricular stroke volume, correlating excellently with the direct Fick method.
Cite This Study
Feigenbaum et al. (1967) studied this question.