A physician is evaluating four different patients in the outpatient clinic who present with varying signs of adrenal dysfunction. Match each patient's clinical presentation and characteristic laboratory profile to the most likely underlying adrenal disorder.
- Primary adrenal insufficiencyA 30-year-old with fatigue and severe hyperpigmentation; decreased serum cortisol, elevated plasma ACTH, and hyperkalemia
- Secondary adrenal insufficiencyA 55-year-old with fatigue after abrupt cessation of chronic glucocorticoids; decreased serum cortisol, decreased plasma ACTH, and normal serum potassium
- Primary hyperaldosteronismA 40-year-old with treatment-resistant hypertension; elevated serum aldosterone, suppressed plasma renin activity, and hypokalemia
- Cortisol-producing adrenal adenomaA 45-year-old with central obesity and muscle weakness; elevated 24-hour urine free cortisol and suppressed plasma ACTH
Cevap
Primary adrenal insufficiency matches the hyperpigmented patient with high ACTH and hyperkalemia. Secondary adrenal insufficiency matches the patient with prior steroid use, low ACTH, and normal potassium. Primary hyperaldosteronism matches the hypertensive patient with high aldosterone, low renin, and hypokalemia. Cortisol-producing adenoma matches the centrally obese patient with high cortisol and suppressed ACTH.
Each disorder presents with a specific laboratory profile dictated by physiological feedback loops. Primary gland failure results in decreased peripheral hormone and elevated trophic hormone, whereas autonomous peripheral hormone production suppresses the trophic hormone. The preservation of aldosterone in pituitary disease distinguishes it from primary adrenal failure.
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Anahtar Kavram
Endocrine feedback loops and the differentiation of primary versus secondary adrenal disorders based on ACTH and electrolyte levels.