Thyroid, Adrenal & Dysglycemic Emergencies
Key Takeaways
In suspected adrenal crisis, obtain cortisol and ACTH if feasible but do not delay hydrocortisone and resuscitation.
Thyroid storm is clinical decompensation; the height of the thyroid hormone level alone does not establish severity.
Myxedema coma requires supportive care, thyroid hormone, and assessment or empirical treatment of adrenal insufficiency.
DKA can occur with modest glucose elevation, especially with SGLT2 inhibitors; ketones and acid–base findings matter.
Endocrine Mimics of Neurologic Catastrophe
The outline includes thyrotoxicosis, myxedema, adrenal failure, dysglycemia, and pituitary disease. These disorders can produce altered consciousness without a new structural lesion. Temperature, heart rate, blood pressure, sodium, glucose, medication history, and the time course help identify the syndrome. More than one process may coexist: an infection can precipitate adrenal crisis or DKA, and pituitary injury can cause both cortisol deficiency and disordered water balance.
A single reassuring result must not terminate assessment. A normal-range TSH may be inappropriate when free T4 is low in central hypothyroidism. A moderately elevated glucose does not exclude ketoacidosis. Cortisol interpretation is affected by illness and preceding glucocorticoids; obtain samples when practical, but treatment of an unstable suspected crisis should not await the laboratory.
Acute Adrenal Insufficiency
Adrenal crisis can cause hypotension, volume depletion, hyponatremia, hypoglycemia, gastrointestinal symptoms, and encephalopathy. Primary adrenal failure may also cause hyperkalemia because mineralocorticoid secretion is impaired. Secondary failure after pituitary injury often preserves aldosterone, so absence of hyperkalemia does not exclude it. Chronic glucocorticoid exposure with abrupt interruption is another important mechanism.
If suspected in an adult, the Endocrine Society recommends immediate parenteral hydrocortisone 100 mg, appropriate fluid resuscitation, and approximately 200 mg over the next 24 hours, given continuously or in divided doses. Correct hypoglycemia and treat the trigger. Draw cortisol and ACTH first when feasible without delaying treatment. Long-term steroid replacement, tapering, mineralocorticoid needs, and diagnostic testing are subsequent individualized decisions.
In panhypopituitarism, assess adrenal, thyroid, gonadal, and water-balance axes. Replace glucocorticoids before thyroid hormone when adrenal insufficiency is possible because increasing metabolic demand can worsen an untreated cortisol deficit. In pituitary apoplexy, severe visual compromise or deteriorating consciousness also requires urgent endocrine and neurosurgical assessment.
Thyroid Storm
Thyroid storm is acute systemic decompensation associated with thyrotoxicosis. Fever, severe tachycardia or atrial fibrillation, agitation or coma, gastrointestinal dysfunction, and cardiac failure are typical clues. It is a clinical diagnosis supported by thyroid tests; hormone concentrations overlap with uncomplicated hyperthyroidism. Infection, surgery, medication interruption, and other stressors can precipitate it.
Management addresses supportive care, the trigger, adrenergic symptoms, hormone synthesis, hormone release, and peripheral conversion. Use a thionamide and give iodine after synthesis blockade when indicated by the protocol. Glucocorticoids provide additional support. Beta-blockade requires particular caution in decompensated heart failure or shock; suppressing compensatory adrenergic tone can precipitate collapse. Do not assume that a rapid heart rate always justifies a large long-acting beta-blocker dose.
Severe Hypothyroidism
Myxedema coma may present with hypothermia, bradycardia, hypoventilation, hyponatremia, and depressed consciousness, sometimes without literal coma. Sedatives and opioids can have amplified effects. Look for a precipitating infection, cold exposure, medication problem, or cardiovascular event. Support ventilation and circulation, use cautious warming, and give thyroid hormone under an appropriate protocol with cardiac risk assessment. Evaluate or cover adrenal insufficiency before thyroid replacement.
| Syndrome | Distinguishing clues | Immediate priority |
|---|---|---|
| Adrenal crisis | Shock, hyponatremia, hypoglycemia, steroid or pituitary history | Hydrocortisone, fluids, glucose when needed |
| Thyroid storm | Fever, marked tachycardia, CNS and systemic decompensation | Multimodal thyroid therapy and circulatory stabilization |
| Myxedema coma | Hypothermia, bradycardia, hypoventilation | Support, glucocorticoid assessment, thyroid replacement |
| DKA/HHS | Dehydration, ketones or hyperosmolality, metabolic disturbance | Fluids, electrolyte-guided insulin, trigger treatment |
Hypoglycemia, DKA, and HHS
Treat symptomatic hypoglycemia promptly with appropriate glucose and recheck. Give thiamine promptly when deficiency is possible, but do not delay life-saving dextrose while waiting for it. Long-acting insulin, sulfonylureas, organ dysfunction, or interrupted nutrition can cause recurrence. Continued monitoring and a cause-specific plan are needed after an initial improvement.
Diabetic ketoacidosis (DKA) requires diabetes or hyperglycemia together with significant ketonemia and metabolic acidosis. SGLT2 inhibitor-associated DKA can occur with relatively modest glucose elevation. Measure beta-hydroxybutyrate when available rather than relying solely on urine ketones. Hyperosmolar hyperglycemic state (HHS) features marked hyperglycemia and hyperosmolality with less prominent ketoacidosis, although mixed presentations occur.
Both require fluid, electrolyte, and insulin management with frequent reassessment. Total-body potassium is often depleted even when the initial serum concentration is high. The 2024 consensus advises delaying insulin in hypokalemia until potassium is above 3.5 mmol/L while replacing it appropriately. Monitor sodium, glucose, potassium, osmolality, and acid–base recovery; avoid abrupt osmotic changes. New neurologic deterioration during treatment requires immediate evaluation for cerebral complications and other causes.
Sources checked October 17, 2026: Endocrine Society adrenal guideline and 2024 hyperglycemic crisis consensus.
An unstable patient with recent pituitary injury has suspected adrenal crisis. Which approach is appropriate?
Wait for the cortisol result before any steroid
Obtain samples if feasible and promptly give hydrocortisone with resuscitation
Give thyroid hormone first
Exclude adrenal failure because potassium is normal
A patient taking an SGLT2 inhibitor has acidosis and significant ketonemia with only modest glucose elevation. What must be considered?
No metabolic emergency is possible
Isolated hyperglycemia without ketosis
DKA despite the glucose concentration
A normal glucose excludes all insulin deficiency
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