Differences in the response to the combined DEX-CRH test between PTSD patients with and without co-morbid depressive disorder.

Abstract:

BACKGROUND:Neuroendocrine studies have shown profound alterations in HPA-axis regulation in posttraumatic stress disorder (PTSD). Based on baseline assessments and the response to dexamethasone, a hypothalamic overdrive with enhanced glucocorticoid feedback inhibition has been suggested. The dexamethasone-corticotrophin releasing hormone (DEX-CRH) test has shown to be a more sensitive test to assess HPA-axis dysregulation in major depression and therefore may provide a useful test tool to probe HPA-axis regulation in PTSD. METHODS:To evaluate the effect of PTSD on HPA-axis regulation, we compared the response to a DEX-CRH test between male veterans with PTSD (n=26) and male veterans, who had been exposed to similar traumatic events during their deployment, without PTSD (n=23). Patients and controls were matched on age, year and region of deployment. Additionally, we compared the response of PTSD patients with (n=13) and without co-morbid major depressive disorder (MDD) (n=13). RESULTS:No significant differences were observed in ACTH and cortisol response to the DEX-CRH test between patients and controls. PTSD patients with co-morbid MDD showed a significantly lower ACTH response compared to patients without co-morbid MDD. The response to the DEX-CRH test did not correlate with PTSD or depressive symptoms. CONCLUSION:The DEX-CRH test did not reveal HPA-axis abnormalities in PTSD patients as compared to trauma controls. PTSD patients with a co-morbid MDD showed an attenuated ACTH response compared to PTSD patients without co-morbid MDD, suggesting the presence of subgroups with different HPA-axis regulation within the PTSD group. Altered sensitivity of the CRH receptors at the pituitary or differences in AVP secretion might explain these differences in response.

journal_title

Psychoneuroendocrinology

authors

de Kloet C,Vermetten E,Lentjes E,Geuze E,van Pelt J,Manuel R,Heijnen C,Westenberg H

doi

10.1016/j.psyneuen.2007.11.016

subject

Has Abstract

pub_date

2008-04-01 00:00:00

pages

313-20

issue

3

eissn

0306-4530

issn

1873-3360

pii

S0306-4530(07)00262-4

journal_volume

33

pub_type

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