Signs of heightened arousal and reactivity, a core symptom of posttraumatic stress disorder (PTSD), are linked with overactivity of the locus coeruleus (LC), a brain region that mediates arousal and reactivity, a new study suggests.
By combining bodily responses and brain imaging data, the new paper by Dr. Christoph Mueller-Pfeiffer at the University of Zurich, Switzerland and colleagues is the first to provide direct human evidence for a theory over 30 years old. Pinpointing the origin of symptoms in the brain is a major step in efforts to improve treatment options for patients with the disorder.
In the study, first author Christoph Naegeli, also of University of Zurich, and colleagues analyzed 54 participants who had been exposed to trauma, about half of whom developed PTSD. When the participants listened to random bursts of white noise, those who were diagnosed with PTSD had more frequent eye blinks, and increased heart rate, skin conductance and pupil area responses - indicators of the body’s autonomic response - than participants without PTSD.
Locus Coeruleus Response
Using functional magnetic resonance imaging to measure brain activity, Naegeli and colleagues found that patients with PTSD had larger brain responses in the LC and other regions wired to the LC that control alertness and motor preparation.
According to Mueller-Pfeiffer, the increased brain activity and autonomic responses measured in the participants provide a biologically plausible explanation for hypervigilance and exaggerated startle responses in PTSD.
However, LC activation was not directly associated with arousal symptoms. Thus, direct links between LC hyperactivity and PTSD symptom severity still need to be demonstrated.
The study may also reveal new avenues for treating these common and disabling symptoms of PTSD.
“Our results suggest that targeting locus coeruleus system hyperactivity with new pharmacological or psychotherapeutic interventions are approaches worthy of further investigation,"
said Dr. Mueller-Pfeiffer.
Naegeli, Christoph et al. Locus Coeruleus Activity Mediates Hyperresponsiveness in Posttraumatic Stress Disorder Biological Psychiatry DOI: http://dx.doi.org/10.1016/j.biopsych.2017.08.021
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