The aim of the study was to evaluate the systolic-diastolic ratio in patients with acute decompensation of heart failure against the background of the intermediate function of the left ventricle. This article is based on data from 585 electrocardiograms of 195 patients (98 males and 97 females), the average age was 64.6±14.8 years. By the level of the ejection fraction of left ventricle (LVEF), all patients were divided into three groups: with a reduced LVEF an intermediate LVEF and a preserved LVEF. As a result it was shown that in the groups of intermediate and low EF, when the systole of ventricles dominate over the diastole, but under the treatment ratio changed to the prevalence of diastole. In the preserved LVEF sample diastole dominates at all stages of the observation. Analysis of the ratio described may be useful for assessment of treatment effectiveness and coronary flow in patients with different types of LV function under acute heart failure decompensation.