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Medial frontal cortex involvement in PTSD symptoms: a SPECT study.

J K Zubieta1, J A Chinitz, U Lombardi

  • 1Department of Psychiatry, and Mental Health Research Institute, The University of Michigan, Ann Arbor, USA. zubieta@umich.edu

Journal of Psychiatric Research
|June 15, 1999
PubMed
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This study found that the medial prefrontal cortex shows increased blood flow in posttraumatic stress disorder (PTSD) patients when exposed to combat sounds. This suggests the medial prefrontal cortex plays a role in PTSD pathophysiology.

Area of Science:

  • Neuroscience
  • Psychiatry
  • Medical Imaging

Background:

  • Posttraumatic stress disorder (PTSD) is a debilitating condition often linked to stress responses.
  • Previous research suggests the medial prefrontal cortex (mPFC) is involved in stress processing in healthy individuals.

Purpose of the Study:

  • To investigate regional cerebral blood flow (rCBF) in the medial prefrontal cortex (mPFC) of Vietnam veterans with PTSD.
  • To examine the neural correlates of stress responses to combat-related auditory stimuli in PTSD.

Main Methods:

  • Single-photon emission tomography (SPECT) was used to measure rCBF.
  • The blood flow tracer [99mTc]-HMPAO was administered.
  • Participants included male veterans with PTSD, combat-exposed controls without PTSD, and healthy controls.

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Main Results:

  • PTSD patients exhibited significantly increased rCBF in the medial prefrontal cortex (mPFC) when exposed to combat sounds compared to white noise.
  • Control groups (combat-exposed without PTSD and healthy controls) did not show significant mPFC blood flow changes.
  • Increased mPFC blood flow in PTSD patients trended towards correlation with psychophysical stress measures.

Conclusions:

  • The medial prefrontal cortex (mPFC) is implicated in the pathophysiology of posttraumatic stress disorder (PTSD).
  • These findings suggest the mPFC may mediate some symptoms of PTSD, particularly in response to trauma-related stimuli.