For citations:

Gordeeva M.S., Serdiukova I.A., Krasichkov A.S., Parmon E.V. Electrocardiographic signs of impaired depolarization (fragmented QRS, early ventricular repolarization, etc.) as markers of left ventricular systolic dysfunction. Russian Journal of Cardiology. 2022;27(7):5113. (In Russ.) https://doi.org/10.15829/1560-4071-2022-5113