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[Various methods of determining left ventricular stroke volume by using echocardiography]
Insights
Echocardiogram calculations for stroke volume (SV) in heart patients can be inaccurate. Left ventricle and mitral valve echocardiograms overestimate SV, while aortic valve echocardiograms underestimate it compared to rheography.
Area of Science:
- Cardiology
- Medical Imaging
- Physiology
Background:
- Stroke volume (SV) determination is crucial for assessing cardiac function.
- Accurate SV measurement is challenging in patients with various heart conditions.
- Echocardiography and rheography are common methods for SV assessment.
Purpose of the Study:
- To compare stroke volume calculations using different echocardiographic formulas.
- To evaluate the accuracy of echocardiography in patients with ischemic heart disease, left ventricular akinesia, valvular disease, and congestive cardiomyopathy.
- To compare echocardiographic SV measurements against tetrapolar rheography as a control method.
Main Methods:
- Utilized various echocardiographic formulas for stroke volume (SV) determination.
- Included patient groups with ischemic heart disease, left ventricular akinesia, mitral and aortic valve disease, and congestive cardiomyopathy.
- Employed tetrapolar rheography as a control measurement for SV.
Main Results:
- Echocardiographic SV calculations for the left ventricle were excessively high in patients with akinesia and valvular regurgitation.
- Similar overestimations of SV were observed using mitral valve echocardiography in cases of relative insufficiency.
- Aortic valve echocardiography yielded lower SV figures than rheography in patients with aortic valve disease.
Conclusions:
- Standard echocardiographic methods may lead to inaccurate stroke volume determinations in specific cardiac pathologies.
- Left ventricular and mitral valve echocardiography tend to overestimate SV in conditions like akinesia and insufficiency.
- Aortic valve echocardiography may underestimate SV compared to rheographic measurements in aortic valve disease.
Abstract:
The determinations of stroke volume (SV) were used with the aid of different formulae in patients with the ischaemic heart disease with areas of akinesia of the left ventricle, and those with the acquired mitral and aortal valve disease, congestive cardiopathy and in healthy individuals. Tetrapolar rheography was used as control. The calculation of SV with echocardiogram of the left ventricle in patients with areas of akinesia of the left ventricle and valvular regurgitation gives unduly high figures. The same data have been obtained in determining the SV with echocardiogram of the mitral valve with relative insufficiency. The figures of SV calculated with the echocardiogram of the aortal valve in patients with the disease of the aortal valve are lower as compared to the rheographic data.