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Difficulty: Very hardMedical History Evaluation

A 54-year-old woman is brought to the emergency department by her husband due to severe weakness, nausea, vomiting, and confusion that began 24 hours ago. The patient returned 5 days ago from a 2-week vacation in Southeast Asia. Her medical history includes severe osteoarthritis of the knees and hypertension. Six months ago, after experiencing refractory joint pain, she began consuming a daily "traditional herbal infusion" imported by a friend. She reported that the infusion provided dramatic pain relief, increased her appetite, and caused a 7-kg (15-lb) weight gain, predominantly in her abdomen. However, her luggage containing the infusion was lost during her return flight, and she has not consumed it for the past 5 days. Her only prescribed medication is amlodipine. She does not smoke or consume alcohol.

Temperature is 38.1°C (100.6°F), blood pressure is 76/40 mm Hg, pulse is 122/min, and respirations are 22/min. Physical examination reveals a lethargic woman with a rounded face and central adiposity but thin extremities. She has no hyperpigmentation of the palmar creases or oral mucosa.

Laboratory results:
Laboratory ParameterResult
Sodium131 mEq/L
Potassium4.2 mEq/L
Chloride98 mEq/L
Bicarbonate22 mEq/L
Blood urea nitrogen32 mg/dL
Creatinine1.4 mg/dL
Glucose52 mg/dL

Based on the patient's medical history and current findings, which of the following is the most likely etiology of her hemodynamic collapse?

  1. Abrupt withdrawal of an unlabeled exogenous glucocorticoidAnswer
  2. B
    Systemic infection by an endemic mosquito-borne pathogen
  3. C
    Autoimmune destruction of the adrenal cortex
  4. D
    Accumulation of an unregulated hepatotoxic botanical compound
  5. E
    Exacerbation of amlodipine-induced vasodilation due to volume depletion

Answer

The most likely etiology is the abrupt withdrawal of an unlabeled exogenous glucocorticoid.
The correct etiology is the abrupt withdrawal of an unlabeled exogenous glucocorticoid. The patient's history of taking a 'miracle' joint supplement that caused central weight gain, increased appetite, and a rounded face strongly points to undeclared exogenous corticosteroids (a common adulterant in unregulated pain remedies). Prolonged use of exogenous steroids causes negative feedback on the hypothalamus and anterior pituitary, leading to suppression of CRH and ACTH, and subsequent atrophy of the adrenal zona fasciculata. When her luggage was lost and the supplement was abruptly stopped, her atrophied adrenal glands could not produce adequate cortisol, resulting in a secondary adrenal crisis (hypotension, hyponatremia, hypoglycemia, and fever).

Step-by-Step Solution

1
Analyze the patient's medical history regarding the unregulated 'herbal infusion'.
The infusion provided rapid pain relief but caused increased appetite, abdominal weight gain, and a rounded face.
These are classic systemic effects of exogenous glucocorticoids, which are frequently found as undeclared adulterants in overseas 'traditional' joint or asthma remedies.
2
Establish the timeline of symptom onset relative to the history.
The patient lost her supply 5 days ago, and symptoms of severe weakness, vomiting, and hypotension began 4 days later.
Chronic exogenous glucocorticoid use suppresses the hypothalamic-pituitary-adrenal (HPA) axis, leading to adrenal atrophy. Abrupt cessation removes the exogenous steroid, but the atrophied adrenal glands cannot immediately resume endogenous cortisol production, precipitating an acute adrenal crisis.
3
Differentiate between primary and secondary adrenal insufficiency using physical exam and laboratory data.
The patient lacks hyperpigmentation, and her potassium level is normal (4.2 mEq/L).
In secondary adrenal insufficiency (due to HPA axis suppression), ACTH is low (so no hyperpigmentation), and aldosterone production remains intact because it is primarily regulated by the renin-angiotensin system, not ACTH. Therefore, potassium levels remain normal, unlike in primary adrenal insufficiency where hyperkalemia is classic.
4
Synthesize findings to rule out confounding historical elements (recent travel).
Although she has a fever and traveled to Southeast Asia, travel-related infections do not fully explain the Cushingoid habitus, hypoglycemia, and the exact timeline linked to the lost luggage.
Fever is a common manifestation of acute adrenal crisis. Anchoring solely on the travel history leads to premature closure and potentially fatal mismanagement.

Key Concept

Evaluating unregulated dietary or herbal supplements for undeclared active pharmaceuticals (like glucocorticoids) is a critical component of medical history taking. Abrupt cessation of these adulterated products can cause secondary adrenal crisis, distinguishable from primary insufficiency by normal potassium levels and absent hyperpigmentation.
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Medical History Evaluation

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