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Stroke volume estimated at aortic root in M-mode echocardiography
Japanese Heart Journal
|March 1, 1981
Summary
A new noninvasive method accurately estimates stroke volume (SV) using aortic root diameter and blood flow velocity. This technique works even with asymmetric heart contractions, offering a valuable tool for clinical assessment.
Area of Science:
- Cardiovascular Physiology
- Medical Imaging and Diagnostics
Background:
- Accurate stroke volume (SV) determination is crucial for cardiovascular assessment.
- Existing methods may be limited in cases of asymmetric cardiac contraction.
Purpose of the Study:
- To develop and validate a noninvasive method for stroke volume estimation applicable to asymmetric heart contractions.
Main Methods:
- A novel equation (SVa0 = kXD2XVao1/2XAOT) was derived using aortic root diameter (D), mean systolic velocity of the anterior wall (Vao), and aortic leaflet opening duration (AOT).
- The method's accuracy was assessed by comparing its results with stroke volume measurements obtained via thermodilution.
Main Results:
- A strong correlation (r = 0.85, p < 0.001) was observed between the stroke volume estimated by the new method (SVAO) and that measured by thermodilution.
- The parameters utilized in the noninvasive method are independent of the cardiac contraction pattern (symmetrical or asymmetrical).
Conclusions:
- The developed noninvasive method provides a reliable estimation of stroke volume.
- This technique's applicability to asymmetric cardiac contractions makes it potentially useful for human stroke volume determination in diverse clinical scenarios.