Refeeding Syndrome

Definition

Serious metabolic complication occurring when nutrition is rapidly reintroduced to severely malnourished patients, characterized by electrolyte shifts, hypophosphatemia, hypomagnesemia, and potentially fatal arrhythmias.

How it works

Refeeding syndrome develops when metabolic switching from catabolism to anabolism occurs too rapidly in malnourished patients. The condition involves rapid shifts of phosphate, potassium, and magnesium from serum into cells for ATP synthesis and anabolic processes, causing severe hypophosphatemia, hypokalemia, and hypomagnesemia. These electrolyte abnormalities cause cardiac arrhythmias, seizures, respiratory failure, and death if severe. Prevention requires slow nutritional advancement (25-50% of needs initially), pre-feeding electrolyte repletion, thiamine supplementation, and frequent monitoring. Recognition of risk factors and appropriate management prevent mortality.

Role

Major complication requiring recognition and prevention through careful refeeding protocols to ensure safe nutritional restoration.

Examples

• Critically ill trauma patients with rapid feeding advancement
• Anorexia nervosa patients given high-calorie feedings too quickly
• ICU patients restarted on full TPN after prolonged NPO status

Recommendations

Identify at-risk patients (BMI <16, unintentional weight loss >15%, prolonged fasting). Repleted phosphate, magnesium, and thiamine before feeding. Begin nutrition at 25-50% of needs and advance gradually. Monitor electrolytes daily for first 5 days, then regularly. Consider ICU monitoring if high-risk.

Key takeaway

Refeeding syndrome is preventable through cautious advancement, electrolyte monitoring, and thiamine supplementation in at-risk malnourished patients.

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