creation date: 2026-04-05 23:53
tags: Pathologies Incomplete
Refeeding Syndrome
Background
Definitions
Refeeding syndrome is a complication from aggressive nutritional rehabilitation. It is characterized by electrolyte irregularities due to fluid and electrolyte shifts.
Refeeding syndrome is a serious condition with a high mortality rate.
Etiology
Refeeding syndrome occurs when a patient with poor nutrition is rapidly or suddenly fed. Causes include:
- Eating disorders
- Chronic alcoholism
- Malabsorptive conditions (eg. IBD)
- Chronic malnutrition
- Poorly controlled diabetes
- Oncological conditions
- Post-operative state
Use of total parenteral nutrition (TPN) is also associated with insulin spikes and electrolyte abnormalities which further worsen refeeding syndrome.
Pathophysiology
Sudden initiation of nutritional replenishment following extended periods of starvation causes glucose levels to spike. This triggers insulin release which results in intracellular movement of phosphorous and potassium (thus hypophosphatemia and hypokalemia. Magnesium levels also drop but the mechanism is unknown.
Hypophosphatemia:
- Decreased cardiac contractility
- Arrhythmias
- Left shift of oxygen-hemoglobin dissociation curve (increases affinity to O2)
- Impaired respiratory muscle function
Hypokalemia: - Cardiac disorders
- Porsades de pointes
Hypomagnesemia: - Exacerbates hypokalemia (increases potassium wasting)
- Neuromuscular symptoms
Thiamine deficiency: - Integral for metabolism of glucose and conversion of lactate to pyruvate
- Neurological impairment
- Cardiac tissue dysfunction
The manifestations of the electrolyte abnormalities are discussed below.
Clinical Presentation
Signs & Symptoms
Findings vary greatly and symptoms reflect electrolyte changes.
Cardiovascular changes:
- Arrhythmias
- Hypotension
- Cardiomyopathy
- Shock
- Bradycardia
- Tachycardia
- Cardiac arrest
Renal:
- Acute tubular necrosis
- Renal failure
- Metabolic acidosis
Respiratory:
- Respiratory failure
- Pulmonary edema
- Hypoventilation
Gastrointestinal:
- Diarrhea and constipation
- Nausea and vomiting
- Paralytic ileus
MSK:
- Rhabdomyolysis
- Myalgias
- Fatigue
- Muscle twitching
- Diaphragm weakness
History & Physical Exam
Risk Factors
High risk populations include patients with:
- Eating disorders
- Depression
- Renal failure
- Malabsorptive conditions
- Previous bariatric surgery
- Alcohol abuse
Risk factors include:
- Low BMI
- Unintentional weight loss
- Starvation
- History of alcohol abuse
- Low initial electrolyte concentrations