Thyroid storm
Thyroid storm is a rare, life-threatening exaggeration of thyrotoxicosis with multiorgan dysfunction and mortality up to 30%, most often precipitated by discontinuation of antithyroid drugs, infection, surgery, or trauma in a patient with underlying hyperthyroidism. It is a clinical diagnosis treated emergently in the ICU with intravenous beta-blockade, a thionamide (propylthiouracil transitioning to methimazole), potassium iodide given only after the thionamide, and high-dose glucocorticoids.
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What this article covers
- Overview
A life-threatening exacerbation of thyrotoxicosis with multiorgan dysfunction, distinguished from severe thyrotoxicosis by the presence of complications such as hemodynamic compromise, altered mental…
- Epidemiology
Rare, occurring in a small fraction of hospitalized patients with thyrotoxicosis, but disproportionately lethal when it occurs.
- Risk factors
Abrupt discontinuation of antithyroid drug therapy, the most commonly cited precipitant.
- Pathophysiology
A precipitating trigger causes a sudden increase in circulating thyroid hormone or a heightened tissue response to existing hormone levels, rather than requiring a new, higher absolute hormone concentration.
- Clinical features
Thyroid storm is a clinical diagnosis defined by the presence of life-threatening complications (hemodynamic compromise, marked central nervous system dysfunction, high fever) in a patient with…
- Differential diagnosis
Severe thyrotoxicosis without storm: shares elevated thyroid hormone and adrenergic symptoms, but distinguished by the absence of life-threatening organ dysfunction (no significant hemodynamic…
- Diagnosis
The diagnosis is clinical, established by severe thyrotoxicosis with life-threatening organ dysfunction; the Burch-Wartofsky Point Scale (scoring thermoregulatory, central nervous system…
- Management
First, admit to the ICU immediately for continuous monitoring and treat any precipitating illness in parallel with thyrotoxicosis-directed therapy.
- Complications
High-output heart failure, pulmonary edema, and cardiogenic shock from sustained severe tachycardia and increased cardiac workload.
- Prognosis
Mortality remains as high as 30% despite modern ICU care, making early recognition and immediate empiric treatment the primary determinant of survival.
- Prevention
Do not abruptly discontinue antithyroid drug therapy without medical supervision, since this is the most common identifiable precipitant; any change in antithyroid regimen should be physician-directed.
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Related articles
- Hyperthyroidism
Hyperthyroidism is the clinical syndrome of thyroid hormone excess, produced by a range of causes from Graves disease and autonomously functioning nodules to destructive thyroiditis and exogenous hormone ingestion. Diagnosis begins with a suppressed thyroid-stimulating hormone and elevated free thyroxine, followed by radioactive iodine uptake testing or antibody measurement to identify the cause, and first-line treatment is a beta blocker for symptom control while the underlying cause directs thionamide, radioactive iodine ablation, or thyroidectomy therapy.
- Graves disease
Graves disease is an autoimmune disorder in which thyrotropin receptor antibodies stimulate the thyroid, causing hyperthyroidism, and is the most common cause of thyrotoxicosis in iodine-sufficient regions. Diagnosis rests on a suppressed thyroid-stimulating hormone with elevated free thyroxine and positive thyrotropin receptor antibodies, and first-line treatment is a thionamide, most often methimazole, with radioactive iodine or thyroidectomy reserved for recurrence or patient preference.
- Myxedema coma
Myxedema coma is a rare, life-threatening decompensation of severe, longstanding untreated hypothyroidism with hemodynamic compromise and mortality up to 30-40%, typically precipitated by cold exposure, infection, or another acute illness. First-line treatment is empiric intravenous glucocorticoids followed immediately by intravenous levothyroxine (300-500 mcg load, then 1.6 mcg/kg/day), with aggressive supportive care in the ICU.
- Adrenal crisis
Adrenal crisis is life-threatening acute glucocorticoid deficiency, most often precipitated by infection or another physiologic stress in a patient with known or unrecognized adrenal insufficiency, presenting with dehydration, hypotension, or shock out of proportion to the concurrent illness. Treatment is immediate intravenous hydrocortisone 100 mg followed by 50 mg every 6 hours plus isotonic saline with dextrose, without waiting for confirmatory labs.