Inclusion Criteria:  Age: 50-90 years old Chronic heart failure (NYHA class II-III) Signed informed consent  Exclusion Criteria:  No consent to the study Age: <50 or >90 years old Any chronic pulmonary diseases diagnosed before Acute respiratory infection 14 days before enrollment (fever ≥38°C and at least one additional symptoms of infection) Acute kidney injury or chronic kidney failure (stage 4 or 5) Acute hepatic failure