Hypercortisolism and Hyperaldosteronism

Mechanisms and Clinical Presentations

Excess cortisol can activate mineralocorticoid receptors, mimicking aldosterone's effects on renal sodium absorption and potassium excretion 2
Hypercortisolism can promote hypertension through activating the renin-angiotensin system, which may indirectly stimulate aldosterone production 1, 2
Patients with Cushing syndrome commonly present with hypertension (prevalence >80%) that mimics features of hyperaldosteronism 1, 2
The blocking of mineralocorticoid actions with spironolactone or eplerenone is often effective in managing hypertension in Cushing syndrome patients 2

In patients with suspected hypercortisolism, measuring plasma aldosterone and renin activity is important to evaluate for concomitant hyperaldosteronism 3, 4
An aldosterone-to-renin ratio >30 is suggestive of primary aldosteronism 4
Adrenal vein sampling is crucial for distinguishing the source of hormone excess in patients with bilateral adrenal masses 3

Treating the underlying hypercortisolism often improves mineralocorticoid-related symptoms 3
Medical management with mineralocorticoid receptor antagonists (spironolactone or eplerenone) is effective for managing the mineralocorticoid effects of cortisol excess 2
Diuretic therapy is often a cornerstone of managing hypertension in Cushing syndrome due to the prominent role of mineralocorticoid receptor activation 2