Citation

Mahabir M, Tucholka A, Shin LM, Etienne P, Brunet A. J. Anxiety Disord. 2015; 36: 127-133.

Affiliation

Department of Neurology and Neurosurgery, McGill University, 3801 University Street, Montreal, QC H3A 2B4, Canada; Douglas Mental Health University Institute, 6875 LaSalle Blvd, Verdun, QC H4H 1R3, Canada; Department of Psychiatry, McGill University, 1033 Pine Avenue West Montreal, QC H3A 1A1, Canada. Electronic address: alain.brunet@mcgill.ca.

Copyright

(Copyright © 2015, Elsevier Publishing)

DOI

10.1016/j.janxdis.2015.10.004

PMID

26551661

Abstract

Individuals with post-traumatic stress disorder (PTSD) exhibit exaggerated emotional reactions to threatening stimuli, which may represent deregulated fear-conditioning, associated with long-term adaptations in the sympathetic nervous system. Within a repeated measures design, functional magnetic resonance imaging (fMRI) was employed to investigate neural responses to threat in PTSD participants (N=7), during the presentation of emotional facial expressions. Scans were separated by 6 weekly reconsolidation impairment treatment sessions, consisting of traumatic memory reactivation under the influence of propranolol. Greater activation before versus after treatment emerged in the thalamus and amygdala during fearful versus neutral face processing. Furthermore, participants showed greater activation after versus before treatment in the right anterior cingulate, during fearful relative to happy face processing. PTSD symptoms significantly improved (d=1.75), post-treatment. These preliminary results suggest that aberrant emotional responding is modulated by noradrenergic plasticity within the amygdala-prefrontal cortex circuit, a neural substrate for the pharmacological treatment of PTSD.

Language: en