Introduction: Thirst and loss of appetite are common but often overlooked symptoms in patients with heart failure (HF). Aim: To examine changes in the dimensions of thirst and appetite, their association with socio-demographic and clinical factors, and their potential impact on clinical outcomes. Methods: We conducted a psychometric evaluation, a cross-sectional epidemiological study, and two prospective observational studies. Data were collected on socio-demographic and clinical characteristics, dimensions of thirst and appetite, anxiety and depression, health-related quality of life, and clinical outcomes. The study included both outpatients and hospitalized patients with HF. We used reliability and validity analyses, group comparison tests, growth modeling, the Kaplan-Meier method, and Cox regression models. Results: The TDS-HF and CNAQ confirmed a one-factor structure and demonstrated good content and criterion validity as well as acceptable reliability. In the cross-sectional study involving 103 outpatients, thirst and reduced appetite co-occurred in approximately one-third of patients and were associated with gender, fluid intake, treatment, and depressive symptoms. In the prospective study involving 56 hospitalized patients, thirst and appetite changed differently after discharge; changes were associated with biochemical markers, fluid restriction, and depressive symptoms. High thirst intensity predicted an increased risk of diuretic dose escalation, emergency department visits, and rehospitalization, while more frequent thirst was associated with a higher likelihood of diuretic dose escalation. Discussion and Conclusion: The Slovenian versions of the TDS-HF and CNAQ are reliable and valid. Thirst and loss of appetite are present across all stages of the disease and are significantly associated with socio-demographic and clinical factors, enabling better identification of high-risk patients. Over 24 weeks of follow-up after discharge, the symptoms evolved differently, but improvement without targeted intervention is unlikely. As both symptoms affect prognosis, they should be regularly monitored. Targeted nursing interventions to relieve thirst and support appetite may significantly improve patients’ health-related quality of life and reduce the risk of adverse clinical outcomes.
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