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Psychobiologic research in post-traumatic stress disorder

S M Southwick1, D Bremner, J H Krystal

  • 1Department of Psychiatry, Yale University School of Medicine, New Haven, Connecticut.

The Psychiatric Clinics of North America
|June 1, 1994
PubMed
Summary

Post-traumatic stress disorder (PTSD) has biological underpinnings, with trauma causing lasting changes in stress response systems. Understanding these neurobiological alterations is key to developing more effective PTSD treatments.

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Area of Science:

  • Neuroscience
  • Psychiatry
  • Trauma Studies

Background:

  • Post-traumatic stress disorder (PTSD) is a chronic condition with partially effective treatments, significantly impacting multiple life domains.
  • While often viewed psychologically, PTSD also has significant biological components.
  • Severe psychological trauma can induce long-lasting neurobiological changes in the stress response system.

Purpose of the Study:

  • To explore the neurobiological underpinnings of PTSD.
  • To examine how trauma-induced alterations in stress response systems contribute to PTSD symptoms.
  • To highlight the role of advancing neurobiological technology in understanding and treating PTSD.

Main Methods:

  • Review of accumulating evidence on neurobiological alterations following trauma.

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  • Analysis of the impact of noradrenergic system sensitization on PTSD symptoms.
  • Discussion of the role of other neurobiological systems in PTSD manifestations.
  • Consideration of advances in physiologic, hormone, receptor assay, and brain imaging technologies.

    • Main Results:

    • Trauma can lead to persistent changes in the neurobiologic stress response.
    • Noradrenergic system sensitization may cause hyperarousal, vigilance, and irritability.
    • Alterations in other neurobiological systems contribute to intrusive memories, dissociation, and numbing.
    • Current neurobiological technologies allow for the characterization of PTSD's biological basis.

    Conclusions:

    • Neurobiological alterations following trauma are central to understanding PTSD.
    • Further advancements in neurobiological technology will enhance the delineation of stress-induced changes.
    • An improved neurobiological understanding is expected to drive the development of more targeted and effective PTSD treatments.