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As a part of the Russian epidemiological survey EPOCH, a representative Ryazan Region sample was examined (953 families, 2098 individuals; mean age 44,8±0,01 years). The prevalence of potential symptoms of Functional Class (FC) I-IV chronic heart failure (CHF) reached 11,1%. In total, 222 patients with clinical symptoms of CHF were examined at hospital, and the diagnosis was confirmed in 75,2%. The prevalence of verified FC I-IV CHF in Ryazan Region was 7,9%. The CHF etiology was represented by arterial hypertension (92,8%), in combination with coronary heart disease (79,6%) and diabetes mellitus (16,2%). Most CHF patients had preserved left ventricular (LV) ejection fraction. In the majority of the patients with sinus rhythm, the first type of LV diastolic dysfunction, with impaired relaxation, was observed.