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Altered cortisol awakening response in posttraumatic stress disorder
Michèle Wessa1, Nicolas Rohleder, Clemens Kirschbaum
1Department of Clinical and Cognitive Neuroscience, Central Institute of Mental Health, University of Heidelberg, J 5, 68159 Mannheim, Germany. wessa@zi-mannheim.de
Psychoneuroendocrinology
|September 13, 2005
Summary
Posttraumatic Stress Disorder (PTSD) is linked to altered hypothalamic-pituitary-adrenal axis function. This study found a blunted cortisol awakening response in PTSD patients, suggesting a counterregulation mechanism for hyper-arousal symptoms.
Area of Science:
- Neuroendocrinology
- Psychiatry
- Trauma Studies
Background:
- The hypothalamic-pituitary-adrenal (HPA) axis is implicated in Posttraumatic Stress Disorder (PTSD), but empirical evidence remains inconsistent.
- Few studies have investigated the cortisol awakening response and diurnal cortisol profiles in PTSD.
- Understanding HPA axis function is crucial for developing effective PTSD treatments.
Purpose of the Study:
- To examine the cortisol awakening response and diurnal cortisol profiles in individuals with and without PTSD.
- To investigate the relationship between cortisol secretion and PTSD symptomatology, particularly hyper-arousal.
- To explore the potential role of HPA axis dysfunction in the pathophysiology of PTSD.
Main Methods:
- Salivary cortisol levels were measured at seven intervals from awakening until 8 PM.
- Participants included trauma-exposed subjects with PTSD (N=29), trauma-exposed subjects without PTSD (N=19), and non-exposed controls (N=15).
- Statistical analyses compared cortisol levels across groups and correlated cortisol secretion with symptom severity.
Main Results:
- No significant differences were observed in the first cortisol level immediately after awakening across the three groups.
- The cortisol increase 15-60 minutes after awakening was significantly lower in PTSD patients compared to non-PTSD subjects and healthy controls.
- This blunted cortisol awakening response persisted even after excluding individuals with comorbid major depression.
- A significant negative correlation was found between overall cortisol secretion (AUC(G)) and PTSD symptomatology, including hyper-arousal symptoms.
Conclusions:
- The findings suggest a blunted cortisol awakening response in PTSD patients.
- This blunted response may represent a counterregulatory mechanism to manage chronic stress and hyper-arousal symptoms in PTSD.
- Further research is needed to elucidate the precise role of HPA axis dysregulation in PTSD pathophysiology and its implications for treatment.