Thyroid storm: workup and management
Thyroid storm is life-threatening thyrotoxicosis with organ dysfunction: hyperthermia, tachycardia or AF, heart failure, agitation or coma, and GI or hepatic dysfunction, usually after a trigger. Diagnose clinically (Burch–Wartofsky ≥45) and treat at once with a beta-blocker, a thionamide, iodine an hour later, glucocorticoids, and treatment of the trigger.
Working diagnosis
Adult · US guidelines
Draft · awaiting physician review
01Orient
What's new in the evidence
- Observational data (2023) found no clear outcome advantage of PTU over methimazole in critically ill patients; methimazole is a reasonable choice, especially with liver concerns
- ATA 2016 guideline remains the main US reference
- Avoid nonselective beta-blockade in decompensated heart failure; use esmolol for titration
Differential diagnoses
- Thyroid storm from Graves disease or toxic nodular goiter
- Triggers: infection, surgery, trauma, iodinated contrast, amiodarone, stopping antithyroid drugs, pregnancy/delivery, DKA
- Sepsis (can't miss; may coexist)
- Sympathomimetic or anticholinergic toxicity, serotonin syndrome, NMS
- Pheochromocytoma crisis
- Alcohol or benzodiazepine withdrawal
02Assess
Risk scores and decision tools
- Burch–Wartofsky Point Scale (≥45 highly suggestive; 25–44 impending)
- Japan Thyroid Association criteria
- Free T4 and T3 do not distinguish storm from uncomplicated thyrotoxicosis
Key history questions
- Known thyroid disease and antithyroid medication adherence
- Recent contrast, amiodarone, surgery, infection, delivery
- Weight loss, heat intolerance, palpitations, tremor, diarrhea
- Confusion, agitation, chest pain, dyspnea
Examination findings
- Fever, tachycardia or AF, wide pulse pressure
- Goiter, ophthalmopathy (Graves)
- Heart failure, jaundice
- Agitation, delirium, tremor
03Investigate
Initial investigations
- TSH, free T4, total or free T3
- CBC, CMP (glucose, calcium, LFTs), blood cultures if febrile
- ECG, troponin, chest X-ray
- Pregnancy test
Advanced investigations
- TSH receptor antibodies (Graves)
- Echocardiogram for heart failure
- Radioactive iodine uptake later (not in the acute phase)
04Treat
Immediate management
- Propranolol 60–80 mg orally every 4 hours (also reduces T4→T3), or esmolol infusion if heart failure or hemodynamically fragile
- PTU 500–1000 mg load then 250 mg every 4 hours, or methimazole 60–80 mg/day in divided doses
- Iodine at least 1 hour after the thionamide: SSKI 5 drops (250 mg) every 6 hours or Lugol's solution
- Hydrocortisone 300 mg IV load then 100 mg every 8 hours
First-line treatment
- Active cooling and acetaminophen (avoid aspirin, which displaces T4)
- Fluids, glucose, treat the trigger (antibiotics if infection)
- Cholestyramine 4 g four times daily to reduce enterohepatic recycling
Second-line treatment
- Refractory: therapeutic plasma exchange; urgent thyroidectomy after stabilization
- Anticoagulation for AF with thyrotoxicosis per stroke risk
Specialist referrals
- Endocrinology
- ICU
- Endocrine surgery for definitive treatment
05Disposition
Admission criteria
- All thyroid storm: ICU
Safe discharge criteria
- Clinically euthyroid trend, stable oral regimen, endocrinology follow-up
Follow-up timing
- Endocrinology within 1–2 weeks; thyroid tests every 2–4 weeks
Patient instructions
- Do not stop antithyroid medication abruptly
- Report sore throat or fever (agranulocytosis) immediately
Monitoring
- Continuous cardiac monitoring
- Temperature, mental status, LFTs and CBC on thionamides
Clinical pearls and pitfalls
- PTU blocks T4→T3 conversion but has a boxed warning for hepatotoxicity
- Giving iodine before a thionamide can worsen thyrotoxicosis
- Mortality remains 10–30%; early ICU care matters
RefGuidelines and landmark evidence
For education only. Typical adult starting points; confirm doses against renal function, allergies, interactions and your institution's protocols. Not a substitute for clinical judgment or senior review.