Association Between Unremitting PTSD and Smaller Right Hippocampal Volume Among Veterans 30 Years After Combat

Area of Science:

• Neuroscience
• Psychiatry
• Trauma Studies

Background:

• Posttraumatic stress disorder (PTSD) often improves over time, but some individuals experience chronic, unremitting symptoms.
• Identifying biomarkers for persistent PTSD is crucial for targeted interventions.

Purpose of the Study:

• To investigate the association between hippocampal volume and the course of posttraumatic stress disorder (PTSD).
• To determine if reduced hippocampal volume predicts chronic PTSD versus PTSD with remission.

Main Methods:

• Study included 44 Vietnam War veterans with traumatic exposure over 30 years prior.
• Compared hippocampal volume in veterans with unremitting PTSD, remitted PTSD, and no PTSD.

Main Results:

• Veterans with unremitting PTSD showed reduced hippocampal volume compared to those who never developed PTSD.
• This reduction was specific to the right hippocampus and not observed in veterans with remitted PTSD.
• Findings align with previous neuroimaging studies in male combat veterans.

Conclusions:

• Reduced hippocampal volume may indicate a failure to recover from PTSD rather than its development.
• Smaller right hippocampi might identify combat veterans at risk for long-term unremitting PTSD.
• These neuroimaging findings could inform prognosis and treatment strategies for PTSD.