Step 1 · Emergency
Recognize clinically
- Hyperthermia + marked tachycardia/AF
- Agitation, delirium, seizure or coma
- Heart failure/shock and GI/hepatic dysfunction
- Search for infection, surgery, iodine exposure or medication interruption
endocrine / metabolic
Hyperthermia, Tachyarrhythmia and Thyrotoxic Organ Failure
Clinical thyroid storm: recognize decompensated thyrotoxicosis, stabilize failing organs, block hormone effect and synthesis/secretion in the correct sequence, and treat the precipitant.
Thyroid storm is a clinical diagnosis of severe thyrotoxicosis with acute cardiovascular, neurologic, thermoregulatory and/or hepatic decompensation. Thyroid hormone concentrations alone do not distinguish storm from uncomplicated thyrotoxicosis; do not delay treatment while waiting for a score or repeat thyroid tests when the bedside syndrome is convincing.
CLINICAL ALGORITHMMedically Verified (2026-09-15)
Decompensated thyrotoxicosis with cardiovascular, neurologic, thermoregulatory or hepatic organ failure
Level: Controlled React algorithm
Visual bedside algorithm
Decompensated thyrotoxicosis with cardiovascular, neurologic, thermoregulatory or hepatic organ failure
Step 2 · Treat
Support organs
- ICU monitoring, oxygen/ventilation as needed
- Cautious fluids according to congestion/perfusion
- External cooling + acetaminophen
- Treat the precipitant in parallel
Step 3 · Assess / decide
Block hormone effects and production
- Beta-blockade only when hemodynamically tolerated; favor titratability when reserve is uncertain
- Give thionamide first
- Give iodide after thionamide, not before
- Add glucocorticoid ± adjunctive cholestyramine
Step 4 · Escalate / reassess
Escalate refractory disease
- Reassess rhythm, perfusion, HF phenotype, CNS and liver function
- Avoid aggressive beta-blockade in low-output shock
- Early endocrine/cardiac/surgical input for plasma exchange, MCS/ECMO or thyroidectomy in selected refractory cases
Bedside bottom line
Sequence matters, and tachycardia may be maintaining cardiac output in thyrotoxic cardiomyopathy—define the hemodynamic phenotype before aggressive beta-blockade.
Recognize
Look for fever/hyperthermia, marked sinus tachycardia or AF, agitation/delirium/coma, heart failure or shock, GI/hepatic dysfunction and a precipitant such as infection, surgery, iodine exposure or interruption of antithyroid therapy. Obtain ECG, electrolytes, glucose, liver tests, CBC/cultures when infection is plausible, TSH and free T4/T3, but treat the syndrome rather than a hormone threshold.
Act now — organ support
ICU monitoring, oxygen/ventilatory support as needed, cautious fluid resuscitation based on congestion/perfusion, active external cooling and acetaminophen for comfort/temperature. Avoid aspirin because it can increase free thyroid hormone. Treat infection or another precipitant in parallel.
Act now — adrenergic control
Use beta-blockade only when hemodynamically tolerated. In uncertain reserve, severe heart failure or evolving shock, a short-acting titratable agent such as esmolol is safer than committing to a long-acting dose; avoid aggressive beta-blockade in low-output cardiogenic shock.
Act now — block synthesis then release
Act now — corticosteroid / adjuncts
Reassess / rescue
Caution
Dangerous trap: reflexively giving a large beta-blocker dose to a patient whose tachycardia is maintaining cardiac output in thyrotoxic cardiomyopathy. Establish the hemodynamic phenotype first and use a short-acting titratable strategy when tolerance is uncertain.
Direct evidence for this problem
2 sourcesguideline•2026
Management of thyroid emergencies: joint consensus statement on management of thyroid storm ↗Current multidisciplinary consensus for ICU thyroid-storm recognition and multimodal treatment.
guideline•2016
Guidelines for the Management of Hyperthyroidism, Thyrotoxicosis, and Thyroid Storm ↗Foundational thyroid-storm treatment sequence and antithyroid therapy guidance.
Evidence status
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