ABSTRACT
The article focuses on modern views on the role and place of left ventricular ejection fraction (LV EF) in determining the status of cardiovascular patients (primarily patients with heart failure) in the algorithm for their diagnosis, treatment, and prediction of the outcome. Conclusions and recommendations on the use of LV EF in patients with chronic heart failure (CHF) are the following: 1) LV EF remains a familiar and convenient instrumental indicator not so much of myocardial contractility as of hemodynamics in general. Assessment of LV EF is useful for selection and ranking of CHF patients whereas the LV EF dynamics is useful for assessing the quality of their management. 2) In the entire population of cardiovascular patients, the "normal" LV EF (mortality nadir) is in the range of 60-65%. 3) LV EF demonstrates a U-shaped relationship with prognosis: in cardiovascular patients with LV EF below the mortality nadir, the relationship is inversely proportional, and above the mortality nadir, it is directly proportional. The question of the boundary between "normal" and "reduced" LV EF in terms of CHF syndrome remains open, but obviously, this boundary is most likely within the range of 50 to 60%. 4) LV EF determines the effectiveness of CHF treatment, but this rule is not applicable to all LV EF ranges and not to all classes of drugs.