• Steven R Peacey, Dianne Wright, Mo Aye, and Robert Moisey.
• Department of Diabetes and Endocrinology, Bradford Teaching Hospitals NHS Foundation Trust, Duckworth Lane, Bradford, UK. steve.peacey@bthft.nhs.uk
• Clin. Endocrinol. (Oxf). 2012 Jul 1; 77 (1): 94-8.

BackgroundHypopituitarism is associated with increased cardiovascular mortality, and it has been suggested that unphysiological glucocorticoid replacement regimens might contribute to this risk. Traditional glucocorticoid replacement regimens have often led to excessive serum cortisol levels. The hypercortisolaemia of Cushing's syndrome is associated with an increased risk of thromboembolism.ObjectiveTo examine whether short-term higher-dose hydrocortisone replacement regimens adversely affect the fibrinolytic system.DesignCrossover study comparing tailored low-dose (LD) glucocorticoid regimen (mean, 17·5 mg hydrocortisone daily), with a traditional high-dose (HD, 30-mg hydrocortisone daily) regimen for 2 weeks.PatientsTen patients with hypopituitarism and ACTH deficiency - median (range) age, 59 (41-75) years - and 10 age- and sex-matched controls. Nine patients had growth hormone deficiency (five replaced), nine patients had TSH deficiency (nine replaced), eight had gonadotrophin deficiency (five replaced). During the study, other pituitary hormone replacement therapy remained unchanged. Patients with acromegaly and Cushing's syndrome were excluded.MeasurementsHourly serum cortisol for 11 h, plasminogen activator inhibitor-1 (PAI-1), tissue plasminogen activator (tPA) and fibrinogen levels after 2 weeks of treatment with both LD and HD regimens.ResultsNo overall significant differences were found between the three groups using the Kruskal-Wallis test: PAI-1: [median (range)] HD, 25 (5-53) ng/ml; LD, 21 (4-56) ng/ml; controls, 27 (8-51); P = 0·3; tPA: HD, 10 (5-15) ng/ml; LD, 10 (4-13) ng/ml; controls 10 (3-13); P = 0·46; and fibrinogen: HD, 2·5 (1·8-3·5) g/l; LD, 3·0 (2·3-4·4) g/l; controls, 2·6 (1·6-3·2): P = 0·97 In addition, no significant differences between HD and LD using Wilcoxon's paired test; PAI-1 (P = 0·91), tPAag (P = 0·47) and fibrinogen (P = 0·09).ConclusionsAn increased dose of hydrocortisone for 2 weeks creates excessive glucocorticoid exposure, but does not significantly affect fibrinolytic-coagulation parameters.© 2012 Blackwell Publishing Ltd.

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