A 38-year-old woman from rural Maharashtra presents with a 3-month history of progressive weakness, weight loss, and hyperpigmentation of skin creases and oral mucosa. Blood pressure is 95/60 mmHg. Laboratory investigations show serum sodium 128 mEq/L, potassium 5.8 mEq/L, and fasting blood glucose 65 mg/dL. A morning cortisol level is 3 μg/dL (reference: 10–20 μg/dL). What is the most appropriate next step in management?

Explanation

## Clinical Assessment This patient presents with classic features of **Addison disease** (primary adrenal insufficiency): - Hyperpigmentation (due to elevated ACTH stimulating melanocytes) - Hypotension and electrolyte abnormalities (hyponatremia, hyperkalemia) - Hypoglycemia - Low morning cortisol (3 μg/dL is severely suppressed) ## Diagnosis is Already Established **Key Point:** The clinical presentation combined with a low morning cortisol (< 5 μg/dL in a symptomatic patient) is diagnostic of adrenal insufficiency. Further confirmatory testing (ACTH stimulation) is NOT required before initiating emergency treatment when the patient is acutely unwell with signs of adrenal crisis. ## Management of Adrenal Crisis **High-Yield:** Acute adrenal crisis is a medical emergency with high mortality if untreated. The immediate management is: 1. **IV fluid resuscitation** — normal saline (0.9%) to correct hypovolemia and hyponatremia 2. **IV hydrocortisone** — 100 mg stat, then 50–100 mg every 6–8 hours (or 50 mg/hour continuous infusion) 3. **Glucose support** — dextrose-containing fluids to correct hypoglycemia 4. **Identify and treat precipitant** — infection, trauma, surgery, medication withdrawal **Clinical Pearl:** Hydrocortisone is the glucocorticoid of choice in acute crisis because it has both glucocorticoid and mineralocorticoid activity (unlike dexamethasone or prednisolone). Once stabilized (24–48 hours), transition to oral maintenance therapy (prednisolone + fludrocortisone). ## Why This Approach? | Step | Rationale | |------|----------| | **IV hydrocortisone immediately** | Prevents cardiovascular collapse and death; no time for confirmatory tests | | **Normal saline IV** | Corrects hypovolemia, hyponatremia, and improves perfusion | | **Avoid oral therapy** | Patient is acutely unwell; IV route ensures rapid absorption and bioavailability | **Warning:** Delaying treatment to perform ACTH stimulation or imaging in a patient with clinical adrenal crisis is dangerous and can be fatal. Diagnosis is clinical + biochemical; treatment must not wait for confirmatory tests.