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Difficulty: MediumMedical History Evaluation

A 45-year-old woman is evaluated in the emergency department for a sudden onset of palpitations, severe anxiety, and diaphoresis that began 2 hours ago. She has a history of major depressive disorder, for which she is prescribed sertraline, and obesity. She reports that she recently started a new intensive health regimen to lose weight for an upcoming family event. Her temperature is 38.2°C (100.8°F), blood pressure is 168/104 mm Hg, pulse is 128/min, and respirations are 22/min. Physical examination reveals mydriasis, diaphoresis, hyperreflexia in the lower extremities, and a fine bilateral tremor. Which of the following historical elements are most critical to elicit to determine the etiology of her current presentation? (Select all that apply)

  1. Explicit inquiry regarding the use of over-the-counter thermogenic weight-loss aidsAnswer
  2. Assessment for recent co-ingestion of botanical supplements such as St. John's wortAnswer
  3. C
    Detailed family history of premature atherosclerotic cardiovascular disease
  4. D
    Verification of prior beta-blocker tolerance to facilitate administration of intravenous metoprolol
  5. E
    Evaluation of current adherence to age-appropriate cervical and breast cancer screening

Answer

The critical historical elements to elicit are explicit inquiry regarding the use of over-the-counter thermogenic weight-loss aids and an assessment for recent co-ingestion of botanical supplements such as St. John's wort.
The correct responses identify the two most likely occult ingestions responsible for the patient's presentation. The patient exhibits classic signs of a toxidrome with autonomic instability (fever, hypertension, tachycardia, diaphoresis) and neuromuscular hyperactivity (hyperreflexia, tremor). Given her history of major depressive disorder on sertraline (an SSRI), she is at high risk for serotonin syndrome if a second serotonergic agent, such as the botanical supplement St. John's wort, is co-ingested. Furthermore, her recent intensive weight-loss efforts raise high suspicion for the use of over-the-counter thermogenic supplements, which often contain sympathomimetics (like synephrine or high-dose caffeine) that can independently cause this clinical picture. Eliciting this specific history is essential for accurate diagnosis and life-saving management.

Step-by-Step Solution

1
Analyze the patient's vital signs and physical examination findings.
The patient is febrile, tachycardic, and hypertensive with mydriasis, diaphoresis, hyperreflexia, and tremor.
To identify the predominant clinical syndrome, which in this case points toward a toxidrome rather than a primary cardiopulmonary event.
2
Correlate the physical findings with the patient's known medication history.
The patient is taking sertraline, an SSRI. The combination of SSRI use, fever, autonomic instability, and neuromuscular hyperactivity (hyperreflexia, tremor) is highly suspicious for serotonin syndrome.
To identify potential drug-drug interactions or adverse effects of prescribed therapies.
3
Integrate the psychosocial history (recent intense weight-loss regimen) with the clinical presentation.
The presentation also heavily overlaps with sympathomimetic toxicity, which can be caused by illicit substances or over-the-counter weight-loss supplements containing stimulants.
To guide specific, targeted questioning regarding occult ingestions that explain the toxidrome.
4
Select the historical elements that directly evaluate for these toxicologic emergencies.
Inquiry about thermogenic weight-loss aids and serotonergic botanical supplements (like St. John's wort) directly addresses the most likely life-threatening etiologies.
These specific questions target the precipitating causes of the patient's mixed serotonergic and sympathomimetic presentation.

Key Concept

In patients presenting with acute autonomic instability and neuromuscular hyperactivity, the medical history must specifically target occult ingestions of sympathomimetics (e.g., weight-loss aids) and serotonergic agents (e.g., St. John's wort), especially in those already taking SSRIs.
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Medical History Evaluation

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