Cited by 78Pituitary Gland Disorders and TreatmentsAdrenal Hormones and DisordersAdrenal and Paraganglionic Tumors

Concomitant medication use can confound interpretation of the combined dexamethasone-corticotropin releasing hormone test in Cushing's syndrome.

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Valassi, Elena, Swearingen, Brooke, Lee, Hang, Nachtigall, Lisa B., Donoho, Daniel A., Klibanski, Anne, Biller, Beverly M. K.·2009·The Journal of Clinical Endocrinology & Metabolism

Abstract

CONTEXT: The ability of combined dexamethasone-corticotropin releasing hormone (Dex-CRH) testing to distinguish pseudo-Cushing's syndrome (PCS) from Cushing's syndrome is controversial. One factor potentially impairing diagnostic efficacy is the concomitant use of commonly prescribed medications that may alter dexamethasone metabolism. OBJECTIVE: Our objective was to assess the diagnostic accuracy of the Dex-CRH test and evaluate the potential impact of concomitant drugs. DESIGN: The study was a retrospective one. PARTICIPANTS: Participants included 101 patients [60 Cushing's disease (CD); 41 PCS] who underwent 112 Dex-CRH tests. Patients were divided into two groups, depending on use of medications potentially interfering with dexamethasone metabolism: 58 tests were classified as No Meds (32 CD; 26 PCS) and 54 as Meds (34 CD; 20 PCS). The latter group was further subdivided into patients taking one medication vs. those taking multiple medications. MAIN OUTCOME MEASURES: Diagnostic accuracy of different serum cortisol and ACTH thresholds at baseline and 15 min after CRH injection was assessed. RESULTS: The specificity of a baseline post-low-dose-dexamethasone-suppressed test cortisol lower than 1.4 microg/dl (38 nmol/liter) was significantly higher in the No Meds vs. the Meds group (P = 0.014). Sensitivity and specificity using a post-CRH cortisol cutoff of 1.4 microg/dl (38 nmol/liter) were 93.1% (95% confidence interval = 88.4-97.8) and 92.3% (95% confidence interval = 87-97.6) in the No Meds group. The specificity of a cortisol lower than 1.4 microg/dl (38 nmol/l) at 15 min after CRH was significantly higher in patients taking only one medication vs. those on multidrug treatment (P < 0.05). CONCLUSIONS: Medications commonly prescribed in hypercortisolemic patients undergoing Dex-CRH testing may contribute to the variable diagnostic accuracy of this test. Prospective studies to address this issue are needed.

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Crossref · 10.1210/jc.2009-1500

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  • Comorbidities such as type 2 diabetes and obesity, and concomitant medications, may affect dexamethasone suppression test results.

    “several comorbidities (i.e.type 2 diabetes and obesity) and concomitant medications may affect the result of the dexamethasone suppression test (DST) (24).”

    From Diagnosis and Treatment of Subclinical Hypercortisolism (2011) · cites this paper as [24]

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Authors
Valassi, E., Swearingen, B., Lee, H., Nachtigall, L. B., Donoho, D. A., Klibanski, A., & Biller, B. M. K.
Affiliations
Harvard University (US)
Corresponding author
Biller, Beverly M. K.
Venue
The Journal of Clinical Endocrinology & Metabolism
Published
2009-12-01
Volume
94
Issue
12
Pages
4851-4859
ISSN
  • 0021-972X (ISSN-L)
  • 1945-7197
OpenAlex
W1966949615
Cited by
78
References
14
Citations by year
2026: 2 · 2025: 3 · 2024: 4 · 2023: 5 · 2022: 3 · 2021: 9 · 2020: 10 · 2019: 2 · 2018: 9 · 2017: 5 · 2016: 4 · 2015: 5 · 2014: 4 · 2013: 1 · 2012: 2
FWCI
2.67
Type
journal article
Language
en
Open access
Locations
  • The Journal of Clinical Endocrinology & Metabolism (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Massachusetts General Hospital
  • National Institutes of Health
  • National Center for Research Resources (UL1RR025758)
Topics
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Pituitary Gland Disorders and Treatments
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Adrenal Hormones and Disorders
  • Health Sciences › Medicine › Surgery › Adrenal and Paraganglionic Tumors
Keywords
Cushing's syndrome, pseudo-Cushing's syndrome, Cushing's disease, dexamethasone/corticotropin-releasing hormone test, concomitant medications, diagnostic accuracy, serum cortisol, ACTH, hypercortisolism
MeSH terms
Adrenocorticotropic Hormone, Adult, Corticotropin-Releasing Hormone, Cushing Syndrome, Dexamethasone, Drug Interactions, Female, Humans, Hydrocortisone, Longitudinal Studies, Male, Middle Aged, Retrospective Studies, Reproducibility of Results

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