This study aims to evaluate the effects of a nursing care decision support system designed to reduce fluid overload in patients with heart failure. The goal is to examine its impact on clinical outcomes both during hospitalization and after discharge at home. The study focuses on improving nursing interventions and patient follow-up through structured, evidence-based decision-making tools.

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