Correlation between anxiety-depression disorders and brain structural connectivity abnormalities after subarachnoid...

Area of Science:

• Neuroscience
• Neurology
• Pathophysiology

Background:

• Subarachnoid hemorrhage (SAH) frequently leads to anxiety (27%-54%) and depression (20%-42%), impacting patient quality of life.
• The underlying mechanisms of post-SAH emotional disorders are not well understood, hindering effective treatments.

Purpose of the Study:

• To investigate potential biomarkers and therapeutic targets for post-SAH emotional disorders.
• To comprehensively analyze behavioral, neuroimaging, and inflammatory changes in a rat SAH model.

Main Methods:

• A rat SAH model was created using cisternal injection of autologous blood.
• Behavioral tests, diffusion tensor imaging (DTI), and inflammatory marker quantification (IL-6, IL-1β, TNF-α) were performed.
• DTI measured white matter microstructure in limbic-prefrontal circuits; inflammatory markers were assessed in serum and cerebrospinal fluid.

Main Results:

• SAH rats displayed significant anxiety- and depression-like behaviors starting at 12 hours post-SAH.
• DTI revealed progressive white matter damage in limbic-prefrontal circuits, with decreased fractional anisotropy (FA) values.
• Elevated inflammatory markers, particularly cerebrospinal fluid IL-1β, strongly correlated with behavioral changes.

Conclusions:

• Post-SAH emotional disorders arise from a temporal sequence of early neuroinflammation.
• Progressive microstructural damage in limbic-prefrontal circuits contributes to emotional dysfunction after SAH.