Endocrine Emergencies Overview, explained for the bedside and the exam

Defining it precisely

Endocrine emergencies overview groups five acute presentations that share features of hormonal excess or deficit but do not share a first treatment. Diabetic ketoacidosis and hyperosmolar hyperglycaemic state both involve severe hyperglycaemia, but DKA is corrected first with insulin while HHS is corrected first with fluids because the profound dehydration, not the ketoacidosis, is the immediate threat.

Thyroid storm and myxoedema coma sit at opposite ends of thyroid function, and adrenal crisis is a cortisol deficiency that can mimic septic shock. Treating each requires recognising which hormone axis is failing before reaching for a drug.

The exceptions that matter

In DKA, insulin is given after fluids have begun and potassium has been checked, because insulin drives potassium into cells and can precipitate dangerous hypokalaemia in a patient who is already potassium-depleted. The first drug is still insulin conceptually, but the nurse does not push it into an unmonitored, unresuscitated patient.

In HHS, insulin is used, but fluid resuscitation takes priority because the osmotic deficit is larger and correcting glucose too fast risks cerebral oedema. In adrenal crisis, hydrocortisone is given even before confirmatory labs return, because delay is what kills the patient, unlike most other endocrine emergencies where some workup precedes treatment.

Using it to prioritise

When a stem gives vague endocrine symptoms and a request for the next action, identify which hormone axis is implicated before choosing a drug class. A patient who is tachycardic, febrile and agitated with a history of hyperthyroidism points to thyroid storm and a beta blocker, usually propranolol, to control the peripheral effects of excess thyroid hormone before antithyroid drugs take effect.

A patient who is bradycardic, hypothermic and hyporesponsive with a history of hypothyroidism points to myxoedema coma, where IV levothyroxine is the priority and warming is supportive, not primary.

Traps in exam wording

Questions frequently swap DKA and HHS answer choices to test whether you default to insulin regardless of the fluid status described. If the stem emphasises glucose over 600 mg/dL with minimal ketones and an older patient with type 2 diabetes, fluids come first even though insulin is also correct at some point in the sequence.

Adrenal crisis is often disguised as unexplained hypotension unresponsive to fluids and vasopressors, sometimes with a history of abrupt corticosteroid withdrawal. The trap is treating it as generic shock rather than recognising hydrocortisone as the definitive intervention.

Examples from practice

A patient with type 1 diabetes presenting with Kussmaul respirations, fruity breath and glucose of 450 mg/dL needs an IV fluid bolus started immediately, followed by an insulin infusion once potassium is confirmed adequate, illustrating the sequencing within DKA management.

A postoperative patient on long-term steroids who becomes hypotensive and confused despite adequate fluid resuscitation is a classic adrenal crisis presentation, and the priority action is administering IV hydrocortisone, not increasing vasopressor support.

Summary

Five emergencies, five different first drugs: insulin for DKA, fluids for HHS, a beta blocker for thyroid storm, levothyroxine for myxoedema coma, and hydrocortisone for adrenal crisis. Identify the hormone axis and the acuity marker in the stem before selecting an intervention, and remember that sequencing within a condition, such as fluids before insulin in DKA, is tested as carefully as the choice between conditions.