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Primary aldosteronism — SCE Endocrinology MCQ

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HardAdrenalPrimary aldosteronismSCE Endocrinology

A patient undergoes selective adenomectomy for ACTH-dependent Cushing disease without peri-operative steroidogenesis inhibitors. At 08:00 on postoperative day 2, serum cortisol is 42 nmol/L and she is haemodynamically stable. What is the best interpretation?

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Correct answer: DEarly remission with temporary adrenal suppression requiring physiological glucocorticoid replacement

Explanation lettering: C = shown as A · E = shown as C · A = shown as E

D is correct. An early postoperative cortisol below about 55 nmol/L is a widely used remission criterion after successful pituitary surgery and reflects transient suppression of normal corticotroph and adrenal function. Physiological glucocorticoid replacement is therefore required until recovery. A low value argues against immediate failure; stable replacement is distinct from crisis boluses. It is interpretable in this setting, and aldosterone remains regulated by the renin–angiotensin system, so fludrocortisone is not routinely required. Long-term recurrence surveillance remains essential.

Reference: Pituitary Society Cushing disease consensus update: https://pmc.ncbi.nlm.nih.gov/articles/PMC8743006/