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Difficulty: Very hardSomatic Symptom and Eating Disorders

A 16-year-old girl is brought to the emergency department by her parents after she fainted during gymnastics practice. She has a 9-month history of severe dietary restriction and intense fear of gaining weight. Her current body mass index (BMI) is 13.2 kg/m213.2 \text{ kg/m}^2. Vital signs show a temperature of 35.2∘C35.2^\circ\text{C} (95.4∘F95.4^\circ\text{F}), blood pressure of 82/50 mm Hg, and a heart rate of 34/min. Physical examination reveals diffuse muscle wasting, lanugo, and delayed capillary refill. Initial laboratory studies show:

ParameterResult
Potassium2.7 mEq/L
Magnesium1.2 mEq/L
Phosphorus2.2 mg/dL

An electrocardiogram (ECG) reveals sinus bradycardia with a QTcF of 510 ms.

Arrange the following management steps in the most appropriate chronological order to safely stabilize and treat this patient.

  1. 1Admit to a medical telemetry unit to monitor for potentially fatal arrhythmias.
  2. 2Administer intravenous thiamine and aggressively replete potassium and magnesium deficits.
  3. 3Initiate nutritional rehabilitation via the oral or enteral route at a conservative 10 to 20 kcal/kg/day.
  4. 4Monitor for and replete precipitous drops in serum phosphorus caused by insulin-mediated intracellular shifts.
  5. 5Initiate family-based treatment (FBT) in an outpatient setting to achieve and maintain target weight.

Answer

The correct sequential order is: 1) Admit to a medical telemetry unit, 2) Administer intravenous thiamine and replete potassium and magnesium, 3) Initiate nutritional rehabilitation at a conservative 10 to 20 kcal/kg/day, 4) Monitor for and replete precipitous drops in serum phosphorus, and 5) Initiate family-based treatment (FBT) in an outpatient setting.
The correct sequence safely addresses the immediate life-threatening complications of severe anorexia nervosa before transitioning to long-term psychiatric management. The patient first requires medical admission and telemetry due to severe bradycardia and prolonged QTc. Second, prophylactic thiamine and electrolyte correction must precede feeding to prevent Wernicke encephalopathy and arrhythmias. Third, conservative refeeding is initiated. Fourth, continuous monitoring and repletion of phosphorus are required as insulin drives electrolytes intracellularly. Finally, once medically stable, the patient transitions to outpatient family-based treatment, the most effective psychotherapy for adolescent anorexia nervosa.

Step-by-Step Solution

1
Assess clinical severity and triage to the appropriate level of care.
Patient is admitted to a medical telemetry unit.
The patient has absolute indications for inpatient medical admission, including a BMI < 15 kg/m², HR < 40/min, and QTcF > 450 ms, requiring continuous cardiac monitoring for fatal arrhythmias.
2
Prepare for nutritional rehabilitation by addressing baseline deficits.
Intravenous thiamine, potassium, and magnesium are administered.
Providing glucose or carbohydrates before correcting these severe deficits can precipitate Wernicke encephalopathy and trigger immediate fatal refeeding syndrome.
3
Begin reversing the state of prolonged starvation.
Nutritional rehabilitation is initiated at a conservative 10 to 20 kcal/kg/day.
A slow, highly controlled introduction of calories blunts the insulin surge, reducing the risk of severe intracellular shifts of electrolytes.
4
Monitor for and manage complications of the refeeding process.
Serum phosphorus is closely monitored and aggressively repleted.
The insulin surge from refeeding causes cellular uptake of phosphorus for ATP synthesis, requiring ongoing aggressive repletion to prevent heart failure and arrhythmias.
5
Plan long-term psychiatric management and weight maintenance.
The patient is transitioned to family-based treatment (FBT).
Once medically stable, FBT is the first-line, evidence-based outpatient psychotherapy for adolescents with anorexia nervosa.

Key Concept

Sequential management of severe anorexia nervosa, emphasizing the prevention of refeeding syndrome and the use of family-based treatment for adolescents.
Estimated Time:2m 0s
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Topics

Somatic Symptom and Eating Disorders

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