A 52-year-old man with known tuberculosis (on anti-TB therapy for 2 months) presents to the emergency department with acute-onset severe hypotension (BP 68/42 mmHg), altered mental status, and fever (38.5°C). His wife reports he had been complaining of fatigue and anorexia for the past month. Laboratory findings: sodium 118 mEq/L, potassium 6.2 mEq/L, glucose 52 mg/dL, cortisol (8 AM) 2.1 µg/dL (normal 10–20 µg/dL), ACTH 1240 pg/mL. What is the immediate management priority?

Explanation

## Acute Adrenal Crisis: Immediate Steroid Replacement ### Clinical Diagnosis: Acute Adrenal Crisis (Addisonian Crisis) **Key Point:** Acute adrenal crisis is a medical emergency with mortality >5% if untreated. Diagnosis is clinical; treatment must not be delayed for confirmatory testing. ### Why This Patient Is in Crisis 1. **Severe hypotension (68/42 mmHg)** — loss of both cortisol and aldosterone → profound vasodilation and hypovolemia. 2. **Altered mental status** — hypoglycemia (52 mg/dL) + hyponatremia (118 mEq/L) + hypoxia from shock. 3. **Fever** — may indicate concurrent infection (TB progression, secondary bacterial infection) or be part of adrenal crisis itself. 4. **Severe hyponatremia (118 mEq/L)** — sodium wasting from aldosterone deficiency; worsened by ADH release from volume depletion. 5. **Severe hyperkalemia (6.2 mEq/L)** — aldosterone loss → potassium retention; risk of cardiac arrhythmias. 6. **Hypoglycemia (52 mg/dL)** — cortisol deficiency → impaired gluconeogenesis. 7. **Low cortisol (2.1 µg/dL) + markedly elevated ACTH (1240 pg/mL)** — confirms primary adrenal insufficiency in extremis. ### Immediate Management Algorithm ```mermaid flowchart TD A[Acute Adrenal Crisis<br/>Clinical diagnosis]:::urgent --> B[IV Hydrocortisone 100 mg stat]:::action B --> C[Repeat 50-100 mg IV<br/>every 6-8 hours]:::action A --> D[IV Normal Saline<br/>1-2 L bolus]:::action A --> E[IV Dextrose 5-10%<br/>for hypoglycemia]:::action D --> F[Correct hyponatremia<br/>cautiously]:::action C --> G[Taper steroids over<br/>3-5 days as stabilizes]:::action A --> H[Identify & treat<br/>precipitant]:::action H --> I[Infection, trauma,<br/>surgery, medication]:::outcome G --> J[Transition to maintenance<br/>glucocorticoid + mineralocorticoid]:::action ``` ### Rationale for Immediate Hydrocortisone **High-Yield:** Hydrocortisone is the steroid of choice in acute crisis because: - **Rapid onset** — IV administration achieves therapeutic levels in minutes. - **Dual action** — hydrocortisone has both glucocorticoid (cortisol replacement) AND mineralocorticoid activity (aldosterone replacement at high doses). - **Dose 100 mg stat** — equivalent to ~250 mg of cortisol secreted during severe stress; subsequent doses maintain this level. - **No delay for testing** — in acute crisis, waiting for Synacthen test results (30–60 min) risks death from refractory shock. **Clinical Pearl:** The diagnosis of acute adrenal crisis is **clinical and biochemical** (low cortisol + high ACTH + shock), not radiological. Immediate steroid replacement is life-saving. ### Fluid & Electrolyte Management | Intervention | Rationale | |--------------|----------| | **IV Normal Saline 1–2 L bolus** | Restores intravascular volume; corrects hypovolemic shock | | **IV Dextrose 5–10%** | Corrects hypoglycemia; glucose <50 mg/dL is life-threatening | | **Cautious Na^+^ correction** | Hyponatremia (118 mEq/L) is severe but chronic; rapid correction risks osmotic demyelination. Target rise: 8–10 mEq/L in first 24 hours | | **Potassium monitoring** | Hyperkalemia (6.2 mEq/L) will improve with hydrocortisone + saline; ECG monitoring for peaked T waves | ### Why Dexamethasone Is NOT First-Line in Crisis **Warning:** Although dexamethasone is used in diagnostic testing (dexamethasone suppression test), it is **NOT** used in acute adrenal crisis because: - Dexamethasone has **no mineralocorticoid activity** → cannot replace aldosterone → hyponatremia and hyperkalemia persist. - Dexamethasone is longer-acting → difficult to titrate in acute settings. - Hydrocortisone is the standard emergency steroid. ### Precipitants of Crisis in This Patient **Mnemonic: CRISIS** — Cortisol deficiency, Respiratory infection, Infection (TB progression), Sepsis, Insufficient steroid coverage, Surgery/trauma In this TB patient: - TB-induced adrenal destruction (likely TB granulomas or caseous necrosis). - Possible concurrent bacterial infection (secondary pneumonia, TB meningitis). - Stress from illness itself. ### Post-Stabilization 1. **Confirm diagnosis** — once stable, perform short Synacthen test (cortisol <18 µg/dL at 30 min confirms primary insufficiency). 2. **Investigate etiology** — CT/MRI abdomen (TB calcification, autoimmune atrophy), TB culture, GeneXpert MTB/RIF. 3. **Maintenance therapy** — after crisis resolves, transition to oral glucocorticoid (prednisolone 5–7.5 mg daily) + mineralocorticoid (fludrocortisone 0.1 mg daily). [cite:Harrison 21e Ch 375; KD Tripathi 8e Ch 56]