High-Risk Refeeding in an Adolescent Admitted With Anorexia Nervosa
A dietitian is asked to see a 19-year-old woman with anorexia nervosa on a general medical ward. Her body mass index is 13.8 kg/m², heart rate 48/min, potassium 3.1 mmol/L, phosphate 0.55 mmol/L, and magnesium 0.70 mmol/L. She has been restricting food and over-exercising for eight months and was admitted after fainting. Her parents want to take her home because “she eats with us,” and she agrees, saying she feels fine. The medical team asks the dietitian to start oral feeding immediately. The ward has no specialist eating disorder beds, and the psychiatric liaison team can review tomorrow. The patient is alert and answers questions but is frightened of weight gain and has asked that her parents not be told how much she has been eating. The dietitian has a normal ward round in 30 minutes and a new referral waiting.
1. How should the dietitian assess risk and begin nutrition safely?
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The dietitian should recognize a high refeeding risk: very low BMI, bradycardia, hypokalemia, hypophosphatemia, and significant restriction. Feeding should not begin at full estimated requirements. The dietitian should confirm the local refeeding protocol with the medical team, start low and advance gradually with close electrolyte monitoring, and ensure thiamine and electrolyte replacement are considered before or alongside feeding. The first 24–72 hours carry the highest risk, so daily or more frequent phosphate, potassium, and magnesium checks and cardiac monitoring are needed. The dietitian should calculate a cautious starting prescription based on weight and protocol, not simply “eat more.” Oral intake is preferable if safe, but the plan must include what to do if intake is inadequate. The dietitian should document the risk assessment and escalate immediately if phosphate falls further or cardiac symptoms develop.
2. How should the dietitian handle the request for immediate discharge and the patient’s confidentiality request?
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The dietitian should not support immediate discharge while the patient is medically unstable and at high refeeding risk. The team should explain that this is a medical safety issue, not a punishment or a judgment about the family. The parents can be involved in practical support and meal supervision without being given every detail of intake if the patient has capacity and the information is not needed for her safety. However, confidentiality is not absolute when serious risk is involved; the dietitian should be clear about what will be shared and why. The patient’s fear of weight gain should be acknowledged, and the plan should be presented as small, monitored steps. Psychiatric liaison should review urgently rather than tomorrow if the patient refuses essential monitoring. The dietitian documents the patient’s wishes, the risk discussion, and the team decision.
3. What should trigger urgent medical escalation during refeeding?
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Escalation triggers include a falling phosphate or potassium, new confusion, weakness, edema, arrhythmia, a further drop in heart rate, chest pain, breathlessness, or inability to complete the agreed intake. The dietitian should not wait for the next routine ward round if these occur. The team should have a written plan for electrolyte replacement, cardiac monitoring, and when to reduce or pause feeding. The dietitian should also watch for refeeding syndrome in a patient who looks calm and says she feels fine, because clinical deterioration can be sudden. Communication with nursing staff is essential: they need to know what to monitor and whom to call. After stabilization, the dietitian should arrange specialist eating disorder follow-up and a family meeting. The reasoning is that early recognition and escalation prevent a preventable medical emergency.