Significance of the left ventricular ejection fraction in diagnosis of heart failure
| Autor: | I I Yarovenko, Yu S Malov |
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| Rok vydání: | 2018 |
| Předmět: | |
| Zdroj: | Bulletin of the Russian Military Medical Academy. 20:68-74 |
| ISSN: | 2687-1424 1682-7392 |
| Popis: | Left ventricular ejection fraction, not being an indicator of contractility, is widely used in practice for the diagnosis of heart failure. It reflects only a change in volume of the left ventricle. It was found that the ejection fraction is not so much dependent on the shock and final diastolic volume as on the final systolic volume. An inverse relationship was found between the left ventricular ejection fraction and the end systolic volume. The larger the end systolic volume, the lower the ejection fraction. High final ejection fraction corresponds to a small terminal systolic volume of the left ventricle. The ejection fraction, representing the ratio of the impact volume to the final diastolic, reflects structural changes in the left ventricle. The more these disorders, the lower the fraction of the ejection of the left ventricle. Its connection with heart failure is realized indirectly through structural restructuring of the myocardium. Low ejection fraction indicates severe damage to the myocardium and unfavorable prognosis for the patient. The empirically established emission fraction did not receive a scientific justification for the regulatory framework. According to the symmetrical approach to the study of a heart, the volume ratio of the left ventricle represents a golden proportion (0,618). Hence, the ideal left ventricular ejection fraction is 62 %, but not 50-80 %, as is customary. An increase or decrease in the ejection fraction indicates a change in the volume of the left ventricle. The clinical morphological similarity of patients with heart failure, classified according to functional classes and size of the ejection fraction, was revealed, which casted doubt on the introduction of the classification of heart failure by the size of the ejection fraction into practice. |
| Databáze: | OpenAIRE |
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