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Aim: Comparative analysis of clinical, anamnestic, and laboratory and instrumental data of patients with chronic heart failure (CHF) and iron deficiency (ID) diagnosed according to the AHA/ESC/RSC criteria, and CHF patients diagnosed with ID based on decreased transferrin saturation (TSAT) ≤19.8% or serum iron (Fe) ≤13 μmol/l., Material and Methods: An additional analysis of the ID-CHF-RF study was performed. The analyzed population included 498 patients (198 women) with CHF. In addition to the ID criteria provided by the protocol (AHA/ESC/RSC criteria: ferritin <100 μg/l or ferritin from 100 to 299 μg/l and TSAT<20%), concentrations of ID biomarkers were assessed, which showed high sensitivity and specificity for the diagnosis of ID compared to the morphological picture of the bone marrow (TSAT<19.8% or Fe ≤13 μmol/l). Subgroups of patients with ID determined only by the AHA/ESC/RSC criteria, only by the TSAT≤19.8% and Fe ≤13 μmol/l criteria, and by both were analyzed., Results: ID diagnosed by the AHA/ESC/RSC criteria was found in 83.1% of patients. The TSAT ≤19.8% and Fe ≤13 μmol/l criteria revealed ID in 74.5% of patients. In 341 patients (76.8%), ID was diagnosed using both criteria. Patients with ID diagnosed by the TSAT≤19.8% and Fe≤13 μmol/l criteria, compared with patients with ID diagnosed by the AHA/ESC/RKO criteria, had a 50% lower Fe (9.8 μmol/l vs. 19.4 μmol/l) and a higher incidence of anemia (43.3% vs. 23.3%) and diabetes mellitus (DM) (36.7% and 24.7%). Also, these patients had higher values of body mass index (BMI) and NT-proBNP concentration (2317 [1305;9092] vs. 1691 [709;3856] pg/ml), and lower LV EF values (41.5 [29.0;54.5]% vs. 45.0 [34.0;54.0]%), respectively. The most severe course of CHF and the greatest changes in laboratory tests associated with ID and anemia were observed in patients with ID determined by two criteria. Patients in this group were older, with a higher BMI, more frequent presence of atrial fibrillation, and higher NT-proBNP (4182 [1854;9341] pg/ml)., Conclusion: Patients with isolated low ferritin are characterized by less severe clinical and functional impairment compared to patients with low TSAT or Fe. At the same time, patients with ferritin higher than 300 μg/l and low TSAT and/or Fe were characterized by very severe CHF and a low functional status, although this may not be related with ID. Thus, the use of the ferritin-based criteria of ID may lead to overdiagnosis of ID in some patients and, at the same time, miss some of the most "severe" patients who likely require the ID correction. Patients with ID who show a decrease in all three parameters are likely to benefit most from Fe supplementation. It is advisable to perform additional studies on the effect of Fe supplements on the course and prognosis of the disease in this cohort of patients.

Despite the presence of various signs of cardiac amyloidosis ("red flags"), the introduction into routine practice of new non-invasive diagnostic methods (Speckle Tracking technology using echocardiography, myocardial scintigraphy with technetium pyrophosphate, genetic testing, screening for free light chains of immunoglobulins to exclude AL-amyloidosis), which have high specificity and sensitivity, transthyretinic (ATTR) cardiomyopathy is still a difficult to diagnose disease, especially in the early stages when treatment is most effective. The article presents a clinical case of ATTR-amyloidosis with predominant heart damage, manifested by severe diastolic heart failure resistant to treatment. The timing, from the moment of the first episode of decompensation of heart failure to death, is 4 months, which confirms the rapid progression of severe biventricular dysfunction of the heart. Despite the presence of cardiac and extracardial "red flags" of ATTR-amyloidosis in the patient, the diagnosis was established at autopsy. The paper analyzes possible errors of early diagnosis at the outpatient and inpatient stages of patient management.