For citations:

Ignatenko G.A., Shchukina E.V., Sarbash I.V. RELATIONSHIP BETWEEN HEART RATE VARIABILITY AND LEFT VENTRICULAR EJECTION FRACTION IN PATIENTS WITH CORONARY HEART DISEASE AND CHRONIC HEART FAILURE. Complex Issues of Cardiovascular Diseases. 2025;14(4):28-36. (In Russ.) https://doi.org/10.17802/2306-1278-2025-14-4-28-36