Management of Hypercortisolism with Adrenal Insufficiency Symptoms

Initial Assessment

The patient presents with a contradictory picture: elevated cortisol but symptoms suggestive of adrenal insufficiency, requiring careful evaluation as it doesn't fit the typical pattern of either primary adrenal insufficiency or secondary adrenal insufficiency 1, 2, 3
Consider the possibility of rapid transition between states, such as resolving Cushing's syndrome with temporary adrenal insufficiency 4

Confirm cortisol elevation with repeat morning cortisol and ACTH measurements, and perform ACTH stimulation test to assess adrenal reserve and function 1, 2, 4
Obtain basic metabolic panel to check for electrolyte abnormalities, and measure renin and aldosterone levels to assess mineralocorticoid function 1, 2, 4
Consider adrenal CT to rule out adrenal masses, hemorrhage, or metastasis 1, 2

Initiate hydrocortisone 20-30 mg in the morning and 10-20 mg in the afternoon if symptoms of adrenal insufficiency are significant, and monitor for clinical improvement of symptoms 1, 2, 4
Provide IV normal saline if there are signs of volume depletion or hypotension 1, 2
For mild symptoms, start replacement therapy with hydrocortisone 15-20 mg in divided doses, and titrate dose based on symptom response, up to maximum of 30 mg daily 1, 4
For moderate symptoms, initiate outpatient treatment at 2-3 times maintenance dose, and taper to maintenance dose over 5-10 days as symptoms improve 1, 2, 4
For severe symptoms, immediate hospitalization is required, with IV stress-dose steroids and IV fluid resuscitation with normal saline 1, 2, 4

Educate patient on stress dosing for illness or surgery, and recommend medical alert bracelet for adrenal insufficiency 1, 4
Schedule follow-up in 2-4 weeks to reassess symptoms and adjust medication, and monitor for signs of iatrogenic Cushing's syndrome 4
If starting both glucocorticoid and thyroid replacement, always start glucocorticoids first to prevent precipitating adrenal crisis 4, 5