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Emergency and Acute Medicine – Adrenal Insufficiency
Overview and Clinical Significance
Adrenal insufficiency occurs when cortisol production is inadequate to meet the body’s physiologic or stress-related demands. In emergency and acute care, the most critical presentation is acute adrenal insufficiency (Addisonian crisis), a life-threatening condition characterized by hypotension, electrolyte disturbances, and shock. Because laboratory confirmation is often delayed or unavailable in the emergency department, early recognition and empiric treatment are essential to prevent morbidity and mortality.
Etiology and Pathophysiology
Adrenal insufficiency is classified as primary, secondary, or tertiary. Primary adrenal insufficiency results from destruction or dysfunction of the adrenal glands and leads to deficiencies in cortisol and often aldosterone. Causes include autoimmune disease, congenital adrenal hyperplasia, infections (such as tuberculosis or fungal disease), metastatic cancer, infiltrative disorders, bilateral adrenal hemorrhage, and medication-related suppression (e.g., etomidate, ketoconazole). Secondary adrenal insufficiency arises from pituitary dysfunction or chronic suppression of ACTH, most commonly due to prolonged glucocorticoid therapy. Tertiary adrenal insufficiency results from hypothalamic dysfunction. An Addisonian crisis is often triggered by infection, trauma, surgery, dehydration, pregnancy, abrupt steroid withdrawal, or initiation of thyroid hormone in an undiagnosed patient.
Clinical Presentation
Symptoms are frequently nonspecific and may include fatigue, weakness, anorexia, nausea, vomiting, abdominal pain, salt craving, dizziness, and muscle or joint pain. Physical findings often include hypotension, tachycardia, fever or hypothermia, weight loss, and altered mental status. Findings more specific to primary adrenal insufficiency include hyperpigmentation, vitiligo, dehydration, hyperkalemia, and hyponatremia. In Addisonian crisis, patients may present in circulatory shock with severe hypotension, hypoglycemia, electrolyte abnormalities, and acute kidney injury.
Diagnostic Evaluation
Diagnosis in the emergency department is primarily clinical. Laboratory findings typically demonstrate hyponatremia, hyperkalemia, elevated BUN and creatinine from volume depletion, and low or inappropriately normal glucose levels. A random serum cortisol level below 20 μg/dL in a critically ill or hypotensive patient strongly suggests adrenal insufficiency, but treatment should not be delayed while awaiting results. Definitive confirmation with a cosyntropin (ACTH) stimulation test is usually performed after stabilization. If steroids must be administered before testing, dexamethasone is preferred because it does not interfere with cortisol assays.
Emergency Management
Initial management follows airway, breathing, and circulation principles. Aggressive volume resuscitation with isotonic saline is critical to correct hypovolemia and hypotension. Immediate glucocorticoid replacement is required, with intravenous hydrocortisone as first-line therapy; dexamethasone is an acceptable alternative. Hypoglycemia should be treated with intravenous dextrose, and life-threatening hyperkalemia managed using standard emergency protocols. Identification and treatment of precipitating factors, particularly infection or medication nonadherence, are essential components of care.
Disposition and Key Pitfalls
All patients with acute adrenal insufficiency require hospital admission, and those with hemodynamic instability should be managed in an intensive care setting. With timely therapy, blood pressure and clinical status typically improve within several hours. A major pitfall in emergency care is failure to recognize adrenal insufficiency in patients with unexplained hypotension or shock refractory to fluids and vasopressors. When suspected, steroid therapy should be administered immediately, as early treatment is lifesaving and should never be delayed for diagnostic confirmation.
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