Posttraumatic survivor guilt is associated with white matter microstructure alterations.

Area of Science:

• Neuroscience
• Psychiatry
• Military Health

Background:

• Posttraumatic stress disorder (PTSD) is prevalent in military veterans.
• Posttraumatic guilt, including guilt over commission/omission and survivor guilt, is a common symptom.
• Survivor guilt involves intense distress from surviving when others did not.

Purpose of the Study:

• To investigate neuroanatomical differences in male veterans with PTSD based on guilt type.
• To compare white matter microstructure, cortical thickness, and volume between guilt groups.

Main Methods:

• Analysis of MRI data from 132 male veterans with PTSD.
• Classification of guilt into commission/omission, survivor guilt, or no guilt using the CAPS-IV.
• Comparison of fractional anisotropy (FA), cortical thickness, and volume across groups.

Main Results:

• Veterans with survivor guilt exhibited significantly lower white matter FA in major fiber bundles compared to those without guilt.
• No significant differences in white matter FA, cortical thickness, or volume were found between veterans with guilt over commission/omission and those without guilt.

Conclusions:

• Survivor guilt is associated with distinct white matter alterations in veterans with PTSD.
• These findings suggest survivor guilt may necessitate specific treatment approaches focused on brain health.
• Limitations include a cross-sectional design and an exclusively male sample, precluding causal inferences and generalizability.