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Difficulty: HardPharmacologic Interventions

A 29-year-old woman is brought to the emergency department by her husband due to severe agitation, confusion, and palpitations that began earlier today. Her husband reports she has been increasingly irritable and has had profuse sweating and watery diarrhea for the past two days. She was diagnosed with a thyroid disorder three years ago but stopped taking her medications six months ago.

Vital signs are temperature 39.8°C (103.6°F), blood pressure 160/90 mm Hg, pulse 155/min and irregularly irregular, and respirations 24/min. Physical examination reveals a distressed, diaphoretic woman. A diffuse, non-tender goiter is palpable. Eye examination shows mild exophthalmos and lid retraction. Neurologic examination is notable for a fine resting tremor and brisk deep tendon reflexes. Electrocardiogram confirms atrial fibrillation with a rapid ventricular response. The patient's clinical presentation is highly consistent with a life-threatening endocrine emergency.

Which of the following pharmacologic interventions should be administered simultaneously as part of the immediate, initial therapeutic regimen? (Select 3)

  1. Intravenous propranololAnswer
  2. Oral propylthiouracilAnswer
  3. Intravenous hydrocortisoneAnswer
  4. D
    Oral potassium iodide
  5. E
    Intravenous amiodarone

Answer

The correct interventions are intravenous propranolol, oral propylthiouracil, and intravenous hydrocortisone.
The correct immediate bundle consists of intravenous propranolol, oral propylthiouracil, and intravenous hydrocortisone. Propranolol rapidly controls adrenergic symptoms and blocks peripheral T4 to T3 conversion. Propylthiouracil blocks de novo thyroid hormone synthesis and also blocks peripheral conversion. Hydrocortisone further inhibits peripheral conversion and treats the relative adrenal insufficiency often precipitated by the hypermetabolic state of thyroid storm. These three agents must be given simultaneously upon recognition of the syndrome.

Step-by-Step Solution

1
Identify the clinical syndrome based on the patient's presentation.
The combination of hyperpyrexia, severe tachycardia, agitation, goiter, exophthalmos, and GI distress points to thyroid storm.
Recognizing this life-threatening endocrine emergency is required to initiate the specific, rapid-acting multi-drug protocol.
2
Determine the therapeutic goals of immediate pharmacologic management.
The immediate goals are blocking peripheral adrenergic effects, halting new hormone synthesis, and preventing peripheral conversion of T4 to T3.
These mechanisms collectively blunt the systemic toxicity of excess thyroid hormone as quickly as possible.
3
Select the medications that achieve these goals safely while avoiding contraindicated agents.
Propranolol, propylthiouracil, and hydrocortisone fulfill these criteria and are given immediately. Potassium iodide and amiodarone are withheld.
Simultaneous administration of these three agents maximizes the blockade of hormone synthesis and effect while respecting the physiologic contraindications of early iodine administration.

Key Concept

The immediate multimodal pharmacologic management of thyroid storm requires simultaneous administration of a beta-blocker, a thionamide, and a glucocorticoid, while strictly delaying iodine therapy.
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Pharmacologic Interventions

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