Mild Cortisol Excess Increases Mortality in Adrenal Incident
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Autonomous cortisol secretion in patients with adrenal incidentalomas is associated with increased mortality, but detailed information about the risk associated with specific levels of autonomous cortisol secretion is not available.

This retrospective cohort study aimed to measure the association between mortality and levels of autonomous cortisol secretion in patients with adrenal incidentalomas.

Consecutive patients who had adrenal incidentalomas were identified between 2005 and 2015 and were followed for up to 14 years. Outcome data were collected from national registers.

Patients were grouped according to plasma cortisol level after a 1-mg dexamethasone suppression test (cortisolDST; less than 50, 50 to 82, 83 to 137, or more than 138 nmol/L).

Results:
-- During a median follow-up of 6.4 years, 170 of 1048 patients died.

-- Compared with a cortisolDST less than 50 nmol/L, a cortisolDST of 50 to 82 nmol/L was not associated with increased mortality.

-- However, a cortisolDST of 83 to 137 nmol/L (n= 119) had an HR of 2.30, and a cortisolDST of 138 nmol/L or higher (n= 82) had an HR of 3.04.

-- Analyses using restricted cubic splines indicated that the association between cortisolDST and mortality was linear up to a cortisolDST of 200 nmol/L.

Conclusively, the association between mortality and cortisolDST increased linearly until cortisolDST reached 200 nmol/L. A cortisolDST of 83 to 137 nmol/L was associated with a 2-fold increase in mortality, and a cortisolDST of 138 nmol/L or higher was associated with a 3-fold increase in mortality. Additional studies should be done, and until those studies are completed some clinicians may consider these findings when deciding which patients to recommend for surgery.

Source: https://www.acpjournals.org/doi/10.7326/M20-7946
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