A 29-year-old woman is perched on the edge of the stretcher, gown damp with sweat, pulse hammering at 168. The room smells faintly of antiseptic and anxious breath; her hands won’t stay still long enough for the cuff to settle. She says she “hasn’t felt right” for days — shaky, hot, and unable to sleep — and now her mother says she’s acting confused, talking fast, then staring blankly at the wall. The monitor keeps flashing sinus tachycardia while she mutters that her neck has “been acting up,” and the next move is still not obvious.

— What’s your move? Read on.

Before you read
  • What distinguishes thyroid storm from a run-of-the-mill thyrotoxic patient?
  • What are the first ED moves that actually change outcomes?

When to Think of It

Think of thyroid storm in the patient with fever, severe tachycardia, CNS dysfunction, GI symptoms, and a hyperadrenergic appearance with known or suspected thyrotoxicosis, especially after infection, surgery, childbirth, iodinated contrast, or stopping antithyroid meds. Hyperthyroidism alone is common; storm is the toxic, crashing version.

Sick or Not Sick

The fork is simple: stable thyrotoxicosis vs. thyroid storm with organ dysfunction. If there is delirium, heart failure, shock, marked hyperthermia, or persistent tachyarrhythmia, treat as storm and admit to ICU.

The First Fifteen Minutes

  • Airway/monitoring/IV access/cooling for any unstable patient → because storm can rapidly spiral into hyperthermic cardiovascular collapse.
  • Propranolol 60–80 mg PO q6h if able to take PO and not in shock/asthma; or esmolol 500 mcg/kg IV bolus over 1 min, then 50 mcg/kg/min infusion if you need titratable rate control, because beta-blockade blunts adrenergic excess and slows T4→T3 conversion. If hypotensive or decompensated heart failure, be cautious and reassess before blocking.
  • PTU 500–1000 mg PO/NG loading, then 250 mg PO/NG q4h or methimazole 20 mg PO/NG q6–8h if PTU unavailable/intolerant, because thionamides stop new hormone synthesis. PTU is often preferred in storm because it also decreases peripheral T4→T3 conversion.
  • Hydrocortisone 100 mg IV now, then 100 mg IV q8h if storm suspected, because it supports possible concomitant adrenal insufficiency and reduces peripheral conversion of T4 to T3.
  • Acetaminophen 650–1000 mg PO/PR/IV for fever; avoid aspirin, because salicylates can increase free thyroid hormone.
  • IV fluids as needed for dehydration; add glucose-containing fluids if prolonged poor intake, because metabolic demand is extreme and catabolism is common.
  • If agitation is severe → lorazepam 1–2 mg IV titrated, because sedation can reduce oxygen demand and allow safer care.

Definitive Care & Disposition

Add iodine only after thionamide (e.g., SSKI or Lugol’s solution; dosing varies by formulation—check institutional protocol), because iodine given first can fuel hormone synthesis. Search for and treat the trigger: infection, MI, DKA, trauma, labor, medication nonadherence, contrast exposure. Admit ICU for storm; endocrine consultation is ideal. Definitive outpatient hyperthyroidism management may later include radioiodine or thyroidectomy, but not in the acute ED phase.

How This One Kills

The lethal miss is treating “just tachycardia and anxiety” while the patient is actually entering arrhythmic, hyperthermic, high-output failure. Another classic error is giving iodine before thionamide or over-blocking a crashing patient with beta-blockers.
The Differential — What Else Looks Like This
  • Sympathomimetic toxicity — both are hot, tachy, and agitated, but thyrotoxicosis has a more sustained endocrine picture and often goiter/ophthalmopathy; confusing them can delay thionamide therapy.
  • Sepsis — fever and delirium overlap, but thyroid storm usually has disproportionate tachycardia, tremor, and known thyroid history; missing storm means missing targeted endocrine therapy.
  • Serotonin syndrome — clonus and hyperreflexia point to serotonin, not thyroid; mislabeling it can misdirect management and miss the true trigger.
  • Pheochromocytoma crisis — episodic headache/sweating/labile BP may look similar, but thyroid storm usually has thyroid signs and persistent thyrotoxic physiology; confusion can lead to wrong sequencing of therapies.

The Second-Day Story

Older adults can present with apathy, weakness, anorexia, or isolated atrial fibrillation rather than dramatic tremor and heat intolerance. Some patients are partially treated, masking the classic picture while still decompensating with delirium, heart failure, or unexplained shock. When the patient looks “too sick for simple hyperthyroidism,” anchor on the physiology: unexplained hyperthermia, tachyarrhythmia, and CNS change should keep storm on the board even if the story is muddy.
Back to Our Patient
Back to our patient: the 29-year-old woman with sweat-drenched clothes, HR 168, confusion, and heat intolerance is not “just anxious” — she has thyroid storm. She meets the Recognize pattern of feverish, hyperadrenergic thyrotoxicosis with CNS change, so we Risk Stratify her as unstable storm rather than simple hyperthyroidism. In the First Fifteen Minutes, she gets monitoring, IV access, cooling, propranolol or esmolol if hemodynamics allow, PTU, hydrocortisone, and acetaminophen, while we search for the trigger and avoid aspirin. She goes to the ICU for definitive management and trigger control, with iodine added only after thionamide if the treating team chooses.
Patient Presentation to Attending
How you’d present this patient on the floor — tight, pertinent positives and negatives, no rambling
“This is a 29-year-old woman with palpitations and altered mental status who came in with several days of heat intolerance, tremor, insomnia, and worsening confusion. On arrival she was diaphoretic with HR 168, hypertensive initially, febrile, and very restless; she has a history suggestive of hyperthyroidism but I don’t have a confirmed medication list yet. She has no focal neurologic deficits, but she is inattentive and intermittently answers inappropriately. I’m concerned for thyroid storm rather than uncomplicated thyrotoxicosis. I’ve placed her on the monitor, started cooling and IV access, sent labs including thyroid studies and trigger workup, and I’m preparing beta-blockade, PTU, and hydrocortisone while watching closely for decompensated heart failure or shock. She needs ICU admission and endocrine consultation.”

Study Directive

  • Draw the thyroid storm treatment sequence from memory: support → beta-blocker → thionamide → steroid → iodine after thionamide → trigger search.
  • Drill the difference between thyrotoxicosis and thyroid storm using 3 bedside features: mental status, hemodynamics, and temperature.
  • Practice one oral presentation of a storm patient in under 30 seconds, including disposition.
  • Review why aspirin is avoided and why PTU can be preferred in storm.
  • Rehearse 3 common precipitants: infection, medication nonadherence, and iodinated contrast.

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