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Difficulty: HardSomatic Symptom and Eating Disorders

A 34-year-old male distance runner is brought to the hospital by his partner due to profound weakness and near-syncope. His body mass index is 13.5 kg/m213.5 \text{ kg/m}^2, heart rate is 38/min38/\text{min}, and blood pressure is 82/50 mm Hg82/50 \text{ mm Hg}. He reports eating fewer than 500 kcal500 \text{ kcal} daily for the past three months to 'improve race times'. He is admitted to the medical intensive care unit for severe anorexia nervosa. Arrange the following steps in the optimal sequence for managing this patient's acute and long-term care to minimize the risk of potentially fatal complications.

  1. 1Obtain a baseline electrocardiogram and comprehensive metabolic panel, including serum phosphorus and magnesium.
  2. 2Replete existing electrolyte deficits and begin careful intravenous fluid resuscitation.
  3. 3Initiate nutritional rehabilitation at a low caloric rate of 10−15 kcal/kg/day10-15 \text{ kcal/kg/day}.
  4. 4Gradually advance caloric intake by 100−200 kcal/day100-200 \text{ kcal/day} with continuous monitoring for peripheral edema and electrolyte shifts.
  5. 5Commence structured cognitive-behavioral therapy for eating disorders (CBT-E).

Answer

The correct sequence requires establishing a metabolic baseline, proactively correcting electrolyte deficits, initiating feeding at a low caloric threshold, slowly advancing calories with close monitoring, and finally initiating formal psychotherapy once the patient is medically and cognitively stable.
The management of severe anorexia nervosa requires a highly orchestrated sequence to prevent refeeding syndrome. Prolonged starvation leads to a total body depletion of phosphorus, potassium, and magnesium, despite potentially normal serum levels due to metabolic adaptation. When carbohydrates are reintroduced, the sudden surge in insulin drives glucose and these electrolytes into the cells. If feeding is started before assessing and repleting these electrolytes, the serum levels crash catastrophically, causing arrhythmias, heart failure, and seizures. Therefore, baseline labs and ECG must be obtained first, followed immediately by fluid and electrolyte repletion. Only after baseline stability is achieved should low-calorie feeding begin (10−15 kcal/kg/day10-15 \text{ kcal/kg/day}). Calories are then cautiously advanced while continuously monitoring for electrolyte shifts and fluid overload. Finally, intensive psychotherapy (CBT) should be delayed until the patient is medically stable and the brain is sufficiently nourished to engage in complex cognitive tasks.

Step-by-Step Solution

1
Obtain baseline electrocardiogram and electrolytes.
Identifies pre-existing hypophosphatemia, hypokalemia, hypomagnesemia, or prolonged QTc.
Establishing a baseline is critical before any intervention that could trigger fluid shifts or insulin release.
2
Replete electrolytes prior to caloric loading.
Normalizes serum levels of critical intracellular ions.
Introducing carbohydrates causes a surge of insulin, which drives phosphorus, potassium, and magnesium into cells. Pre-repletion prevents fatal depletion.
3
Initiate feeding at 10−15 kcal/kg10-15 \text{ kcal/kg} per day.
Safely reintroduces glucose to a starved metabolic system.
Starting at a low caloric rate minimizes the magnitude of the insulin spike, serving as a primary defense against refeeding syndrome.
4
Gradually advance caloric intake with continuous monitoring.
Achieves nutritional restoration while mitigating risk.
The risk of refeeding syndrome persists for up to two weeks; careful titration and daily monitoring allow for early detection and treatment of electrolyte shifts.
5
Initiate cognitive-behavioral therapy (CBT-E).
Addresses the underlying psychiatric pathology.
Severely malnourished brains lack the cognitive flexibility required for CBT. Psychotherapy is only effective once baseline medical stability and partial weight restoration are achieved.

Key Concept

Refeeding syndrome pathophysiology and sequential management in severe Anorexia Nervosa.
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Topics

Somatic Symptom and Eating Disorders

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