Midnight salivary cortisol determination for assessing the outcome of transsphenoidal surgery in Cushing's disease

The Journal of Clinical Endocrinology and Metabolism
Carmen A CarrascoJérôme Bertherat

Abstract

Midnight salivary cortisol (MSC) is now recognized as a reliable index for Cushing's syndrome diagnosis but has to be validated for the follow-up of treated patients. Our objective was to evaluate MSC for assessing the outcome of transsphenoidal surgery (TSS) in patients with Cushing's disease (CD). We conducted a retrospective cohort study in a single center. Sixty-eight patients treated by TSS between 1996 and 2006 and followed for at least 6 months with postoperative MSC were included. Mean follow-up (+/- sd) was 45 +/- 31 months. Morning plasma cortisol was determined 5 d after TSS, and MSC and urinary cortisol (UC) were determined 6-12 months after surgery. The remission group included hypocortisolic (morning plasma cortisol < 50 ng/ml and/or insufficient response to cosyntropin) and eucortisolic (midnight plasma cortisol < 75 ng/ml and normal UC) patients. Patients in the treatment failure group had high midnight plasma cortisol and UC concentrations. Fifty patients (74%) were in remission. Mean MSC was 0.7 +/- 0.4 ng/ml (range, 0.4-2.1 ng/ml) and 6.5 +/- 6.5 ng/ml (range, 2.1-27.2 ng/ml) for the remission and treatment failure groups, respectively (P = 0.001). A cutoff of 2 ng/ml for MSC gave a sensitivity of 100% and a ...Continue Reading

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