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Difficulty: HardMedical History Evaluation

A 42-year-old woman is evaluated in the outpatient clinic for medication-refractory hypertension. She is currently prescribed maximum tolerated doses of amlodipine, valsartan, and chlorthalidone. Despite reported medication adherence, her home blood pressure readings average 170/105 mm Hg. Over the past three months, she has developed progressive fatigue, polyuria, and painful muscle spasms in her calves. Her past medical history is notable for chronic dyspepsia, for which she prefers natural remedies over prescription antacids, and a laparoscopic cholecystectomy 5 years ago. She does not smoke or consume alcohol and works as a high school teacher. Vital signs show a blood pressure of 172/108 mm Hg and a heart rate of 78/min. Physical examination is notable for 4/5 motor strength in the proximal lower extremities; no abdominal bruits or striae are appreciated. Initial laboratory studies reveal a serum potassium of 2.6 mEq/L and a serum bicarbonate of 33 mEq/L. Subsequent hormonal evaluation demonstrates profoundly suppressed plasma renin activity and undetectable serum aldosterone levels. Which of the following elements of the patient's medical history is most critical to specifically elicit in order to establish the diagnosis?

  1. A
    Frequency of over-the-counter nonsteroidal anti-inflammatory drug use
  2. B
    Recent utilization of sympathomimetic cold and sinus preparations
  3. Detailed inventory of non-pharmacologic remedies and supplements for dyspepsiaAnswer
  4. D
    Family history of fibromuscular dysplasia or early-onset cerebrovascular events
  5. E
    Presence of paroxysmal headache, generalized diaphoresis, and tachycardia

Answer

The most critical historical element to elicit is a detailed inventory of non-pharmacologic remedies and supplements for dyspepsia, specifically to identify chronic licorice root ingestion.
The correct answer identifies the need to obtain a detailed supplement history. The patient's severe hypertension, hypokalemia, metabolic alkalosis, and suppressed renin/aldosterone levels characterize a syndrome of apparent mineralocorticoid excess. Her history of using natural remedies for dyspepsia strongly suggests chronic ingestion of licorice root (glycyrrhizin). Glycyrrhizin inhibits the enzyme 11-beta-hydroxysteroid dehydrogenase type 2 in the kidneys, preventing the conversion of active cortisol to inactive cortisone. The excess cortisol then inappropriately activates renal mineralocorticoid receptors, mimicking hyperaldosteronism but suppressing both endogenous renin and aldosterone. Thus, explicitly asking about her non-pharmacologic remedies is the critical diagnostic step.

Step-by-Step Solution

1
Analyze the patient's vital signs and laboratory findings in the context of her chief complaint.
The patient presents with severe, medication-refractory hypertension, profound hypokalemia, and metabolic alkalosis.
Identifying the clinical syndrome (mineralocorticoid excess) is the necessary first step before interpreting the hormonal workup.
2
Interpret the endocrine workup results to narrow the differential diagnosis.
Both plasma renin activity and serum aldosterone are profoundly suppressed.
Suppressed renin and aldosterone eliminate primary hyperaldosteronism (high aldosterone, low renin) and secondary hyperaldosteronism (high renin, high aldosterone), pointing toward an exogenous mineralocorticoid effect or rare genetic syndrome.
3
Correlate the pathophysiologic state with clues from the patient's background history.
The patient uses natural remedies for chronic dyspepsia. Licorice root (glycyrrhizin) is a common natural remedy for gastric distress that inhibits 11-beta-hydroxysteroid dehydrogenase type 2.
Connecting the biochemical pattern to a possible historical exposure allows the clinician to formulate a targeted diagnostic question.
4
Determine the most critical historical inquiry to establish the diagnosis.
Asking for a detailed inventory of supplements and remedies is essential.
Confirming exogenous glycyrrhizin ingestion definitively diagnoses her syndrome of apparent mineralocorticoid excess.

Key Concept

Patients presenting with treatment-resistant hypertension, hypokalemia, metabolic alkalosis, and suppressed renin/aldosterone should be carefully interviewed regarding the use of over-the-counter supplements, specifically licorice root, which causes a syndrome of apparent mineralocorticoid excess.
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Medical History Evaluation

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