Regularising algorithm of parameter identification of electric charge equivalent circuit

A new algorithm of parameter identification of equivalent circuit for electrical charge replacement is suggested. The approach is based on the solution of integral equation of the I type with respect to the function of indicial admittance, by which then determination of replacement circuit parameters is carried out. Application of smoothing splines and original regulating algorithm including kernel setting error of integration equation permits to obtain a stable algorithm of parameter identification. The investigation of algorithm shows high calculating efficiency and sufficient accuracy of parameter identification

Current approaches to risk assessment of chronic heart failure after myocardial infarction

In the last decade, there has been an increase in the number of survivors of myocardial infarction (MI). However, the risk of developing chronic heart failure (CHF) remains high in this category of patients. Population aging and comorbidity further contribute to adverse outcomes. Optimization of approaches to identify predictors of postinfarction CHF is an important clinical task of modern medicine. The aim of the investigation is to develop a method to assess the risk of CHF development after MI. Material and Methods. The present analysis included 186 patients who underwent MI from January 2019 to January 2020: 86 patients with signs of CHF above functional class (FC) 2 (NYHA) (mean age 64.3 years) and 100 patients without signs of CHF or with CHF 1 (NYHA) (mean age 62.6 years) by day 30 of MI. A mathematical model of CHF risk after MI was built by factor and correlation analysis methods. Results. A method for assessing CHF risk after a previous MI was developed. The proposed formula is programmed in Excel table processor and includes 5 indicators: presence of atrial fibrillation, Killip class of acute heart failure, triglycerides level, ST-segment elevation of electrocardiogram, left ventricular ejection fraction less than 45 %. The authors’ approach allows long-term personalized monitoring, taking into account the ranked contribution of each factor in a particular patient; it is characterized by high sensitivity, specificity, and accuracy. Conclusion. The present study investigated the factors of formation of postinfarct chronic heart failure syndrome. An original mathematical formula for CHF risk estimation, including routine indices of MI patients, has been proposed. The approach allows personalized management of selected cohorts of patients – with increased and standard risk of postinfarction CHF