Post-Adrenalectomy Steroid Protocol in Cushing Syndrome

Why replacement is needed

1. Unilateral adrenalectomy (adenoma/ACC) - "steroid dependent" until axis recovers

• Intraoperative stress-dose hydrocortisone is standard: 100 mg IV before/at surgery, then 100 mg IV every 8 hours for the first 24 hours (or oral prednisone equivalent) - Morgan and Mikhail's Clinical Anesthesiology, p. 76.
• Some protocols use a higher initial load (up to 200 mg hydrocortisone in the first 24 hours), then step down to 100 mg, 75 mg, 50 mg/day over the following days.

• After the acute post-op days, rapid taper over roughly 2-3 days down to a physiologic maintenance dose of hydrocortisone 15-25 mg/day in divided doses (e.g., 10-15 mg AM, 5-10 mg early afternoon), or an equivalent prednisone dose.
• Maintenance continues until the suppressed contralateral adrenal "wakes up." This is confirmed with morning cortisol or a cosyntropin (ACTH) stimulation test rather than by a fixed calendar - steroids should not be stopped just because time has passed; recovery must be biochemically documented.
• Most patients can be weaned off exogenous steroid entirely within roughly 6-12 months, though recovery is variable and some take longer, particularly if hypercortisolism was severe or prolonged (chronic glucocorticoid receptor downregulation can make even "standard" 30 mg/day replacement insufficient in some patients).
• For mild/subclinical autonomous cortisol secretion (MACS), glucocorticoid replacement is not routine for everyone - it's used selectively, guided by post-op day-1 morning cortisol or cosyntropin testing (Fischer's Mastery of Surgery, p. 1942).

• A commonly used approach: taper by a hydrocortisone-equivalent of about 5 mg/day per week (dropping afternoon/evening doses first to restore circadian pattern) until reaching 15-20 mg/day, then hold and biochemically test for HPA recovery before further weaning.
• Watch for glucocorticoid/steroid withdrawal syndrome (myalgia, fatigue, nausea, mood changes, arthralgia) - these symptoms mimic adrenal insufficiency but occur despite adequate replacement, reflecting tissue-level glucocorticoid dependence after chronic excess; they can complicate and prolong the taper and are managed by slowing (not stopping) the taper and treating symptomatically.

2. Bilateral adrenalectomy - lifelong replacement, no recovery expected

• Since both glands are gone, there is no prospect of HPA axis recovery - glucocorticoid AND mineralocorticoid replacement are lifelong.
• Hydrocortisone is the glucocorticoid of choice (short half-life, mimics circadian cortisol rhythm), given in divided daily doses.
• Fludrocortisone is added for mineralocorticoid replacement.
• Patients need a medical alert bracelet/card noting adrenal insufficiency, sick-day stress-dosing rules (double/triple oral dose for illness, IM/IV hydrocortisone for vomiting or major stress/surgery), and long-term endocrine follow-up (BP, weight, growth in children, signs of over- or under-replacement).
• Bilateral adrenalectomy also carries a risk of Nelson syndrome (progressive corticotroph adenoma growth from loss of cortisol feedback) - inadequate glucocorticoid replacement is a recognized risk factor, so adequate dosing also matters for this reason (Goldman-Cecil Medicine).

Key monitoring points

• Confirm adequacy of replacement clinically (avoid both under-replacement/adrenal crisis and over-replacement/re-inducing Cushingoid features).
• Use morning cortisol or cosyntropin stimulation testing to time down-titration/discontinuation in unilateral cases - don't rely on symptoms alone, since withdrawal symptoms can persist even when replacement is adequate.
• Educate all patients (unilateral, at least until axis recovery is confirmed; bilateral, permanently) on stress dosing for illness, trauma, or surgery to prevent adrenal crisis.

Note on evidence base