Changes in cerebral morphology consequent to peripheral autonomic denervation

Area of Science:

• Neuroscience
• Autonomic Nervous System Research
• Neuroimaging

Background:

• Pure autonomic failure (PAF) involves peripheral autonomic denervation, impairing arousal responses.
• Patients with PAF lack autonomic nervous system activity during physical or cognitive challenges.

Purpose of the Study:

• To investigate if chronic absence of peripheral autonomic responses in PAF leads to structural brain changes.
• To test for morphological alterations in brain regions associated with autonomic control.

Main Methods:

• Utilized optimized voxel-based morphometry on structural MRI scans.
• Compared grey and white matter differences between 15 PAF patients and matched controls.

Main Results:

• No significant differences in global grey matter, white matter, or CSF volume between groups.
• Identified significant regional decreases in grey matter volume and concentration in the anterior cingulate and insular cortices of PAF patients.
• Brainstem and subcortical regions did not show statistically significant morphometric differences.

Conclusions:

• Peripheral autonomic denervation in PAF is linked to grey matter reduction in cortical autonomic control areas.
• These brain changes may reflect experience-dependent alterations resulting from diminished afferent input.
• Further research is needed to determine the precise nature of these observed morphometric changes.