A 38-year-old woman from rural Maharashtra presents with a 3-month history of progressive fatigue, weight loss (8 kg), and postural dizziness. On examination, she is hypotensive (BP 95/60 mmHg), has generalized hyperpigmentation over knuckles and oral mucosa, and demonstrates a positive orthostatic vital sign change. Serum sodium is 128 mEq/L and potassium is 5.8 mEq/L. A morning cortisol is 3 µg/dL (normal >10 µg/dL). What is the most appropriate next step in management?

Explanation

## Clinical Recognition This patient presents with **acute adrenal crisis superimposed on chronic Addison disease**. The constellation of hypotension, hyponatremia (128 mEq/L), hyperkalemia (5.8 mEq/L), hyperpigmentation, and low morning cortisol (3 µg/dL) confirms primary adrenal insufficiency with acute decompensation. **Key Point:** Acute adrenal crisis is a medical emergency with mortality rates of 5–10% if untreated. Clinical signs include severe hypotension, altered mental status, abdominal pain, and electrolyte derangement. ## Management Algorithm ```mermaid flowchart TD A[Suspected acute adrenal crisis]:::outcome --> B{Hemodynamically unstable?}:::decision B -->|Yes| C[IV hydrocortisone 50 mg stat]:::urgent C --> D[Continuous infusion 50-100 mg q6-8h]:::action D --> E[Aggressive IV fluid resuscitation<br/>Normal saline]:::action E --> F[Correct electrolytes<br/>Monitor K+, Na+]:::action F --> G[Diagnostic tests after stabilization<br/>ACTH, cortisol, imaging]:::action B -->|No| H[Oral glucocorticoid replacement<br/>+ outpatient workup]:::action ``` ## Why IV Hydrocortisone Immediately? 1. **Rapid onset:** IV hydrocortisone achieves therapeutic levels within minutes; oral agents take hours to peak. 2. **Mineralocorticoid activity:** Hydrocortisone (at high doses) provides both glucocorticoid and mineralocorticoid effects, addressing both sodium loss and hypotension. 3. **Dosing in crisis:** 50 mg IV stat, then 50–100 mg every 6–8 hours (or continuous infusion) until hemodynamic stability is restored, then taper to maintenance. 4. **Concurrent fluid resuscitation:** Normal saline (0.9%) to restore intravascular volume and correct hyponatremia gradually (no faster than 8–10 mEq/L per 24 hours to avoid osmotic demyelination). **High-Yield:** Do NOT delay IV hydrocortisone for diagnostic confirmation. Empiric treatment in suspected crisis is standard of care — diagnostic tests (ACTH, cortisol) can be drawn at the same time but should not delay therapy. **Clinical Pearl:** Hyperpigmentation in this case is due to elevated ACTH (primary adrenal insufficiency drives ACTH up via loss of negative feedback). This distinguishes Addison disease from secondary adrenal insufficiency, where ACTH is low and hyperpigmentation is absent. ## Maintenance After Stabilization Once crisis resolves (typically 24–48 hours): - Taper IV hydrocortisone to oral glucocorticoid (e.g., prednisolone 5–7.5 mg daily in divided doses). - Add fludrocortisone 0.1–0.2 mg daily for mineralocorticoid replacement (only in primary adrenal insufficiency). - Arrange confirmatory testing (ACTH stimulation test, imaging of adrenal glands) after acute phase.