Morphometric and psychometric comparisons between non-substance-abusing patients with posttraumatic stress disorder...

Area of Science:

• Neuroscience
• Psychiatry
• Medical Imaging

Background:

• Hippocampal volume reduction in posttraumatic stress disorder (PTSD) remains debated.
• Previous studies often lacked control for substance abuse, confounding results.

Purpose of the Study:

• Confirm hippocampal volume differences in PTSD patients versus controls, excluding substance abuse.
• Investigate the impact of disease duration and depression severity on hippocampal morphology.
• Validate region of interest (ROI) findings with voxel-based morphometry (VBM).
• Explore correlations between brain structure and cognitive performance.

Main Methods:

• Region of Interest (ROI) and Voxel-Based Morphometry (VBM) analyses were employed.
• 23 PTSD patients and 17 healthy controls participated.
• Culturally neutral cognitive tests assessed various functions.

Main Results:

• ROI analysis revealed significantly reduced global and bilateral hippocampal gray matter in PTSD patients.
• VBM confirmed group differences, identifying reduced gray matter in the right hippocampus in the PTSD group.
• Negative correlation found between disease duration and hippocampal volume, and between depression scores and parahippocampal volume.
• No significant correlation was observed between hippocampal/parahippocampal volumes and cognitive test scores.

Conclusions:

• Morphological differences in the hippocampus in PTSD are not attributable to alcohol or drug abuse.
• VBM findings partially support ROI results in the medial temporal lobe.
• Impaired short-term memory in PTSD may stem from broader neurological factors beyond hippocampal volume.