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Psychoneuroendocrinology. 2008 Apr;33(3):313-20. doi: 10.1016/j.psyneuen.2007.11.016. Epub 2008 Jan 22.

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

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  • 1Department of Military Psychiatry, Central Military Hospital, Utrecht, The Netherlands. c.de.kloet@altrecht.nl



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.


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).


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.


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.

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