Refeeding Syndrome is a condition that occurs when patients who are undernourished or undernourished suddenly start overfeeding, causing electrolyte disturbances and vitamin deficiencies, resulting in neurological and cardiac problems. It may even result in death. It is aimed to prevent the development of Refeeding Syndrome with nutrition in accordance with the guidelines. The aim of this study is to determine the risk factors for Refeeding Syndrome in Intensive Care Unit (ICU).

Nutritional support is an important part of treatment in intensive care patients. Especially existing comorbidities and developing acute problems before intensive care admission can cause serious malnutrition for patients. Refeeding syndrome is a serious, life-threatening condition accompanied by electrolyte and metabolic disorders as a result of rapid re-feeding following prolonged starvation or malnutrition. The condition may be accompanied by electrolyte disorders such as hypophosphatemia, hypokalemia and hypomagnesemia, as well as decrease in vitamin levels (especially vitamin B1), fluid imbalance and salt retention. The resulting imbalances can cause cardiac and neurological side effects, impaired organ functions and even death. The refeeding protocol should be individualized to each patient's clinical situation. In this study, although nutritional protocols in accordance with the guidelines are applied in patients with risk factors for the development of Refeeding Syndrome, whether Refeeding Syndrome develops and the facilitating factors will be investigated in ICU.

Inclusion Criteria:

1. Patients are intensive care patients
2. Patients' age > 18 -

Exclusion Criteria:

1. Diabetic ketoacidosis
2. Other risk factors for hypophosphatemia (patients on continuous hemodialysis, hyperphosphatemia treatment, parathyroidectomy)
3. Patients with pre-study hypophosphatemia (< 0.65 mmol/L)
4. Patients with hyperparathyroidism
5. Terminal stage cancer patients
6. Patients with Glasgow Coma Scale ≤5
7. Patients with respiratory and metabolic alkalosis -

Adult patients receiving treatment in intensive care at Samsun University Hospital