A 52-year-old man with a 6-month history of fatigue, weight loss, and darkening of skin presents to the emergency department with acute-onset severe abdominal pain, vomiting, and altered mental status. Blood pressure is 76/48 mmHg, heart rate 118/min, and temperature 38.2°C. Laboratory investigations reveal: sodium 122 mEq/L, potassium 6.2 mEq/L, cortisol (8 AM) 2.1 µg/dL, ACTH 487 pg/mL, and blood glucose 48 mg/dL. What is the immediate next step in management?

Explanation

## Acute Adrenal Crisis: Immediate Management ### Clinical Context: Addisonian Crisis **Key Point:** This patient is in acute adrenal crisis—a life-threatening emergency characterized by severe hypotension, hyponatremia, hyperkalemia, hypoglycemia, and altered mental status. Immediate glucocorticoid replacement is required; diagnostic confirmation can wait. ### Why IV Hydrocortisone Is the Answer **High-Yield:** In acute adrenal crisis, **do not delay treatment for diagnostic testing**. Clinical suspicion + biochemical evidence (low cortisol, high ACTH) = treat immediately. 1. **Immediate threat to life** — hypotension (76/48), altered mental status, severe hyponatremia (122), and hypoglycemia (48 mg/dL) require urgent reversal. 2. **IV hydrocortisone is the gold standard** — provides both glucocorticoid and mineralocorticoid activity (cortisol has weak mineralocorticoid effect; fludrocortisone can be added later). 3. **Dosing in acute crisis** — 50–100 mg IV bolus immediately, then 50–100 mg IV every 6 hours (or continuous infusion 0.5–1 mg/kg/hr) until stabilized. 4. **Concurrent management** — aggressive IV fluid resuscitation with 0.9% normal saline (contains Na^+^, supports BP and corrects hyponatremia), dextrose for hypoglycemia, and investigation/treatment of the precipitant (infection, trauma, surgery). ### Diagnostic Confirmation Can Be Deferred **Clinical Pearl:** The diagnosis of primary adrenal insufficiency is already supported by: - Basal cortisol 2.1 µg/dL (< 5 µg/dL = insufficient) - ACTH 487 pg/mL (markedly elevated, confirming primary AI) - Classic clinical triad: hyperpigmentation, electrolyte abnormalities, hypotension Short Synacthen test, imaging, and other confirmatory tests are performed **after stabilization**, not during the acute crisis. ### Management Algorithm for Adrenal Crisis ```mermaid flowchart TD A[Suspected acute adrenal crisis]:::urgent --> B[Draw blood for cortisol,<br/>ACTH, electrolytes]:::action B --> C[IV hydrocortisone<br/>50-100 mg bolus<br/>+ 50-100 mg Q6H]:::action C --> D[IV 0.9% saline<br/>aggressive fluid resuscitation]:::action D --> E[Dextrose if glucose<br/>< 60 mg/dL]:::action E --> F[Investigate precipitant<br/>infection, trauma, etc.]:::action F --> G{Stabilized?}:::decision G -->|Yes| H[Transition to oral<br/>prednisolone + fludrocortisone]:::action G -->|No| I[Continue IV therapy<br/>& ICU monitoring]:::action H --> J[Diagnostic confirmation<br/>Synacthen test, imaging]:::action ``` ### Maintenance Therapy (After Stabilization) | Phase | Glucocorticoid | Mineralocorticoid | Duration | |-------|---|---|---| | **Acute crisis** | IV hydrocortisone 50–100 mg Q6H | — | Until BP stable | | **Transition** | Oral prednisolone 15–20 mg daily | Fludrocortisone 0.1 mg daily | Days 2–7 | | **Maintenance** | Prednisolone 5–7.5 mg daily | Fludrocortisone 0.05–0.1 mg daily | Lifelong | **Warning:** Do NOT use oral glucocorticoids alone in acute crisis—IV route is essential for rapid absorption and hemodynamic support. ### Precipitants to Identify Common triggers for adrenal crisis in known/suspected Addison disease: - Infection (UTI, pneumonia, TB flare) - Surgery or trauma - Medication non-compliance - Acute illness (MI, stroke) - Emotional stress In this case, the acute abdominal pain and fever suggest an infectious trigger—obtain blood cultures, imaging, and urinalysis.