Stress hormones and post-traumatic stress disorder in civilian trauma victims: a longitudinal study. Part II: the adrenergic response.

The aim of the study was to prospectively evaluate the association between the occurrence of post-traumatic stress disorder (PTSD) and the adrenergic response to the traumatic event, and additionally, to explore the link between PTSD and the initial norepinephrine:cortisol ratio. Plasma levels and urinary excretion of norepinephrine (NE) were measured in 155 survivors of traumatic events during their admission to a general hospital emergency room (ER) and at 10 d, 1 month and 5 months later. Symptoms of peri-traumatic dissociation, PTSD and depression were assessed in each follow-up session. The Clinician-Administered PTSD Scale (CAPS) conferred a diagnosis of PTSD at 5 months. Trauma survivors with (n=31) and without (n=124) PTSD had similar levels of plasma NE, urinary NE excretion, and NE:cortisol ratio in the ER. Plasma NE levels were lower in subjects with PTSD at 10 d, 1 month, and 5 months. There was a weak but significant positive correlation between plasma levels of NE in the ER and concurrent heart rate, and a negative correlation between NE in the ER and dissociation symptoms. Peripheral levels of NE, shortly after traumatic events, are poor risk indicators of subsequent PTSD among civilian trauma victims. Simplified biological models may not properly capture the complex aetiology of PTSD.