Combined dexamethasone/corticotropin-releasing hormone test in patients with schizophrenia and in normal controls: II

Hypothalamic—pituitary—adrenal system (HPA) function was tested in 24 patients with schizophrenia and compared to 24 age-matched healthy volunteers using the combined dexamethasone-suppression (DST/CRH) corticotropin-releasing hormone stimulation test (DST/CRH). After stimulation with CRH, the dexamethasone-pretreated patients released significantly more cortisol, but a similar amount of adrenocorticotropic hormone (ACTH) in comparison to controls. No association between DST status and degree of severity of illness and/or current medication was found. However, in comparison to unmedicated patients, those patients currently receiving antipsychotics, who were also those with a lesser degree of severity of illness, showed a decreased release of CRH-stimulated cortisol and ACTH. This study demonstrates that schizophrenic patients have a dysregulation of the HPA system as assessed with the DEX/CRH test. Overall, however, the degree of HPA-system dysfunction in schizophrenic patients seems to be of a lesser magnitude than in patients with affective disorders