Adrenal Crisis

A patient on long-term prednisone undergoes emergency surgery and their blood pressure suddenly bottoms out — the missing stress dose just became life-threatening.

Adrenal crisis (acute adrenal insufficiency) is a medical emergency triggered when cortisol demand exceeds supply. The most common cause isn't primary adrenal failure — it's abrupt discontinuation of exogenous corticosteroids after prolonged use, which suppresses the hypothalamic-pituitary-adrenal axis. When a physiologic stressor hits (surgery, sepsis, trauma), the suppressed adrenals cannot mount the needed cortisol surge. Critical distinction: in primary adrenal insufficiency (Addison's), both cortisol and aldosterone are lost → hyperkalemia, hyponatremia, and hypoglycemia. In secondary insufficiency (steroid withdrawal), aldosterone is typically preserved → hyponatremia and hypoglycemia occur, but hyperkalemia is usually absent. Hallmark presentation is hypotension inadequately responsive to fluids and vasopressors alone — glucocorticoid replacement is required to restore vascular tone. Patients may present with altered mental status, severe weakness, fever, abdominal pain mimicking an acute abdomen, and cardiovascular collapse. Emergency treatment is IV hydrocortisone 100 mg bolus — do not wait for confirmatory labs (cosyntropin stimulation test confirms adrenal insufficiency but should never delay treatment). Simultaneously, aggressive IV normal saline with dextrose corrects volume depletion and hypoglycemia. Nursing priorities: continuous hemodynamic monitoring, frequent glucose checks, strict I&O, and never tapering corticosteroids abruptly in any patient on long-term therapy.

Key Distinctions

Don't confuse adrenal crisis (hypotension, hyponatremia) with thyroid storm (hypertension, tachycardia, hyperthermia) — both are endocrine emergencies but present in opposite hemodynamic directions. Students mistake adrenal crisis for septic shock because both cause refractory hypotension and both may respond to stress-dose steroids; differentiate by clinical context — steroid history and absence of infectious source point to adrenal crisis. Chronic Addison's is the slow smolder (hyperpigmentation, gradual fatigue); adrenal crisis is the house fire (acute cardiovascular collapse). In primary AI, fludrocortisone (mineralocorticoid replacement) is needed long-term; in secondary AI from steroid withdrawal, it is not.

Clinical Pearl

Never stop steroids cold turkey. If a long-term steroid patient is crashing post-op with unexplained hypotension — think cortisol, push hydrocortisone, ask questions later.