Horm Metab Res 2010; 42(13): 961-966
DOI: 10.1055/s-0030-1265218
Humans, Clinical

© Georg Thieme Verlag KG Stuttgart · New York

Variable Sensitivity to the Glucocorticoid Activity of Cortisol in Patients with Primary Adrenal Insufficiency: Assessment with ACTH Profiles

B. Ekman1 , J. Blomgren2 , P.-O. Andersson2 , M. Carlsson3 , H. J. Arnqvist4
  • 1Department of Medicine and Health Sciences, Division of Internal Medicine, Faculty of Health Sciences, Linköping University, Linköping, Sweden
  • 2Internal Medicine County Hospital, Eksjö, Sweden
  • 3Internal Medicine County Hospital, Kalmar, Sweden
  • 4Department of Clinical and Experimental Medicine, Division of Cellbiology, Faculty of Health Sciences, Linköping University, Linköping, Sweden
Further Information

Publication History

received 30.04.2010

accepted 23.08.2010

Publication Date:
05 October 2010 (online)

Abstract

Our aim was to investigate the usefulness of circulating levels of adrenocorticotropic hormone (ACTH) and also salivary cortisol to monitor cortisone substitution in patients with Addison's disease. 13 patients with primary adrenal insufficiency (8 women and 5 men, age 44±11 years) received 12.5 mg cortisone acetate orally at 16:00 h and 25 mg at 07:00 h. Blood samples for cortisol and ACTH analysis were drawn every hour for 24 h, and also every half hour between 07:00 and 12:00 h. Samples for salivary cortisol were collected in parallel. Total ACTH levels showed large inter-individual variations and a diurnal rhythm with a nadir in the early evening at 19:00 (median 19 ng/l, range 2–434 ng/l) and high levels in the early morning, with a peak around 07:30 (median 844 ng/l, range 45–2 249 ng/l). Plasma cortisol concentrations showed 2 peaks distinct in time, but variable in height, 1–2 h after intake of cortisone. Plasma cortisol correlated significantly with ln(ACTH) at 17:00 h (r=–0.56), at 10:00 h (r=–0.51), and at 10.30 h (r=–0.57). When tested at different time points, ln(ACTH) at 10:00 to 12:00 h was negatively correlated with plasma cortisol between 08:30 and 12:00 h. Plasma cortisol was highly correlated to ln(salivary cortisol) most of the time points measured, but 30–60 min after intake of cortisone acetate the correlation disappeared. In conclusion, the large interindividual variation in ACTH levels most likely indicates varying sensitivity to cortisol with a need for individualized dosing schemes. Furthermore ACTH-determinations may be useful for dose titration of cortisol.

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Correspondence

H. J. Arnqvist MD, PhD 

Department of Endocrinology

and Diabetology

University Hospital

581 85 Linköping

Sweden

Phone: +46/13/222 000

Fax: +46/13/223 502

Email: Hans.Arnqvist@liu.se