The Effect of Nursing Care Decision Support System Designed for Fluid Volume Excess of Patients With Heart Failure on Clinical Outcomes of Patients and Home Self-Care Outcomes

Inclusion Criteria: * Diagnosed with heart failure (HF) * Aged 18 years or older * Ejection fraction below 50% * Presence of +1 or greater pitting edema in the extremities * Voluntary agreement to participate in the study * Sufficient cognitive and communicative ability to participate in interviews and complete scales/forms Exclusion Criteria: * Presence of additional comorbidities other than cardiac risk factors (e.g., dialysis-dependent renal failure, lymphedema, oncology patients, etc.) * Presence of severe valvular stenosis * History of amputation * Classified as morbidly obese * Isolated right heart failure * Inadequate cooperation or communication skills * Terminal stage patients * Absence of echocardiographic evaluation * BNP level not measured Criteria for Discontinuation During the Study: * Inaccessible by phone * Withdrawal of consent * Development of poor general condition during follow-up * Transferred to intensive care units during follow-up * Extended hospitalization due to infection or other secondary causes