A 52-year-old man with a known history of pulmonary tuberculosis (treated 2 years ago) presents to the outpatient clinic with a 6-week history of progressive weakness, anorexia, and recurrent episodes of dizziness. His wife reports that he has become increasingly withdrawn and forgetful. On examination, he is found to be hypotensive (BP 92/58 mmHg) and has darkening of the skin over the palms and creases. Serum sodium is 132 mEq/L and potassium is 5.2 mEq/L. A morning cortisol level is 3.5 µg/dL (normal > 10 µg/dL) and ACTH is 620 pg/mL. Which of the following is the most appropriate next step in management?

Explanation

## Management of Addison Disease: Acute vs. Chronic Presentation ### Clinical Assessment of This Patient **High-Yield:** This patient has symptomatic primary adrenal insufficiency (confirmed by elevated ACTH with suppressed cortisol, hyponatremia, hyperkalemia, and hyperpigmentation) with signs of adrenal crisis (severe hypotension, altered mental status, syncope). The diagnosis is already biochemically confirmed — no further testing is needed before treatment initiation. **Key Point:** The presence of symptomatic hypotension, hyponatremia, and altered mental status constitutes an adrenal crisis and requires IMMEDIATE glucocorticoid replacement. Delaying treatment for confirmatory testing could be life-threatening. ### Why Immediate IV Hydrocortisone is Correct **Clinical Pearl:** In acute adrenal crisis, IV hydrocortisone is the gold standard because: 1. Rapid onset of action (minutes) 2. Has both glucocorticoid AND mineralocorticoid activity at high doses 3. Allows rapid fluid resuscitation and hemodynamic stabilization 4. Can be titrated based on clinical response ### Treatment Protocol for Acute Addison Crisis ```mermaid flowchart TD A["Suspected/Confirmed Addison Crisis<br/>(Hypotension + Hyponatremia + Altered Mental Status)"]:::urgent A --> B["Immediate IV Hydrocortisone 100 mg<br/>Repeat every 6-8 hours for 24 hrs"]:::action B --> C["Aggressive IV Fluid Resuscitation<br/>Normal saline 0.9% 500 mL/hr"]:::action C --> D["Monitor BP, Na+, K+, Glucose"]:::decision D --> E{"Clinical Improvement?"} E -->|Yes| F["Transition to Oral Replacement<br/>Hydrocortisone 15-20 mg/day<br/>+ Fludrocortisone 0.1 mg/day"]:::action E -->|No| G["Continue IV Hydrocortisone<br/>Investigate for precipitant"]:::action ``` ### Maintenance Therapy After Stabilization | Drug | Dose | Indication | Notes | |------|------|-----------|-------| | Hydrocortisone | 15–20 mg/day (divided doses) | Glucocorticoid replacement | Morning dose 10 mg, afternoon 5 mg | | Fludrocortisone | 0.1–0.2 mg/day | Mineralocorticoid replacement | Only needed in primary insufficiency | **Mnemonic: HYDROCORTISONE IN CRISIS — HY**drocortisone **100 mg** IV, **D**ivide doses **every 6–8 hours**, **R**esuscitate with **saline**, **O**ral replacement **after stabilization**, **C**ontinue **monitoring**, **O**ptimize **maintenance doses** ### Why This Patient Needs Immediate Treatment 1. **Symptomatic hypotension** (92/58 mmHg) with syncope = hemodynamic compromise 2. **Altered mental status** (withdrawn, forgetful) = cerebral hypoperfusion 3. **Biochemical confirmation** already present (low cortisol, high ACTH, electrolyte derangement) 4. **Risk of cardiovascular collapse** if not treated urgently [cite:Harrison 21e Ch 375; KD Tripathi 8e Ch 23]