A 45-year-old man with known tuberculosis (on anti-TB therapy for 8 months) presents to the emergency department with severe hypotension (BP 78/45 mmHg), confusion, and fever (38.5°C). He reports 3 weeks of progressive weakness, anorexia, and darkening of skin. On examination, he is cachectic with diffuse bronze-like pigmentation. Serum sodium is 118 mEq/L, potassium 6.2 mEq/L, and random cortisol is 1.8 µg/dL. What is the most appropriate immediate management?

Explanation

## Acute Adrenal Crisis: Immediate Management ### Clinical Scenario: Adrenal Crisis **Key Point:** This patient is in **acute adrenal crisis** — a medical emergency with shock, altered mental status, severe electrolyte derangement, and biochemical evidence of adrenal failure (low cortisol in the setting of severe stress). Treatment must be initiated immediately without waiting for confirmatory tests. ### Why Immediate IV Hydrocortisone? **High-Yield:** In adrenal crisis, **do not delay steroids for diagnostic confirmation**. The risk of death from untreated shock far outweighs the risk of giving steroids empirically. ### Pharmacology of Hydrocortisone vs. Dexamethasone | Agent | Glucocorticoid Activity | Mineralocorticoid Activity | Onset | Use in Crisis | |-------|------------------------|---------------------------|-------|---------------| | Hydrocortisone (cortisol) | 1× | 1× (significant) | Rapid IV | **Gold standard** | | Dexamethasone | 25–30× | Minimal | Rapid IV | Acceptable if hydrocortisone unavailable; lacks mineralocorticoid effect | | Prednisolone | 4–5× | Minimal | Slow (oral) | **Not for acute crisis** | **Clinical Pearl:** Hydrocortisone is preferred in adrenal crisis because it provides both glucocorticoid AND mineralocorticoid replacement, addressing both cortisol and aldosterone deficiency. Dexamethasone lacks mineralocorticoid activity and is suboptimal for crisis management. ### Acute Adrenal Crisis Management Algorithm ```mermaid flowchart TD A[Suspected adrenal crisis]:::urgent --> B[Obtain IV access, blood cultures, labs]:::action B --> C[Stat IV hydrocortisone 100 mg]:::action C --> D[Continue hydrocortisone 50-100 mg IV q6-8h]:::action D --> E[Aggressive IV saline resuscitation]:::action E --> F[Monitor BP, HR, electrolytes q1-2h]:::action F --> G[Treat underlying cause]:::action G --> H{Stabilized?}:::decision H -->|Yes| I[Taper to maintenance dose over 48-72h]:::action H -->|No| J[Increase hydrocortisone dose, ICU monitoring]:::urgent I --> K[Transition to oral glucocorticoid + mineralocorticoid]:::action ``` ### Dosing Regimen for Acute Crisis 1. **Initial bolus:** IV hydrocortisone 100 mg stat 2. **Maintenance:** 50–100 mg IV every 6–8 hours for 24–48 hours 3. **After stabilization:** Taper over 48–72 hours to maintenance dose (typically 15–20 mg daily in divided doses) 4. **Long-term:** Glucocorticoid (e.g., prednisolone 5–7.5 mg daily) + mineralocorticoid (e.g., fludrocortisone 0.05–0.1 mg daily) ### Concurrent Management - **IV fluids:** Normal saline 1–2 L in first 1–2 hours to restore intravascular volume and correct hyponatremia gradually (avoid rapid correction >8 mEq/L per 24 h to prevent osmotic demyelination) - **Treat underlying cause:** In this case, TB-related adrenal destruction; continue anti-TB therapy - **Monitoring:** Vital signs, urine output, electrolytes, glucose every 1–2 hours initially **Warning:** Do NOT use fluid restriction or hypertonic saline in adrenal crisis — these patients are volume-depleted and require aggressive saline resuscitation. Hyponatremia will correct as cortisol is repleted and intravascular volume is restored. ### Why Not the Other Options? **Option 1 (Correct):** Hydrocortisone IV is the standard of care — rapid onset, dual glucocorticoid and mineralocorticoid activity, proven mortality benefit in crisis. **Option 2:** Oral prednisolone is too slow for acute crisis; onset is delayed and bioavailability is unpredictable in shock. Also lacks mineralocorticoid activity. **Option 3:** Dexamethasone lacks mineralocorticoid activity and is inferior to hydrocortisone in crisis, though acceptable if hydrocortisone is unavailable. Should not be first-line. **Option 4:** Fluid restriction is contraindicated in adrenal crisis (patient is hypovolemic). Hypertonic saline is not indicated — normal saline resuscitation corrects hyponatremia safely. Delaying steroids pending ACTH stimulation test is dangerous — diagnosis is clinical and biochemical; do not wait. [cite:Harrison 21e Ch 379; Endocrine Society Clinical Practice Guidelines for Adrenal Insufficiency]