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Abnormal sympathetic skin responses in thalamic lesions
P Montagna1, P Cortelli, P Avoni
1Institute of Neurology, University of Bologna, Italy.
Electroencephalography and Clinical Neurophysiology
|June 1, 1992
Summary
Sympathetic skin responses (SSRs) were abolished in patients with thalamic degeneration, indicating the thalamus is crucial for these autonomic functions. This suggests frontal cortical connections are also vital for SSR integrity.
Area of Science:
- Neuroscience
- Autonomic Nervous System Research
- Neurology
Background:
- Sympathetic skin responses (SSRs) are key indicators of autonomic nervous system function.
- Fatal familial thalamic degeneration is a rare, progressive neurological disorder.
Purpose of the Study:
- To investigate the role of specific thalamic nuclei in the regulation of SSRs.
- To determine if thalamic degeneration impacts SSRs independently of peripheral autonomic system lesions.
Main Methods:
- Assessed SSRs in four patients diagnosed with fatal familial thalamic degeneration.
- Examined lesions in anterior (A) and dorsomedial (DM) thalamic nuclei.
- Ruled out peripheral vegetative system or nerve damage as causes for SSR abnormalities.
Main Results:
- SSRs were completely abolished in all four patients studied.
- Thalamic lesions, specifically in the A and DM nuclei, correlated with the loss of SSRs.
- Abnormalities were not attributable to peripheral nerve damage.
Conclusions:
- SSR integrity is dependent on specific thalamic structures, referred to as the "visceral" thalamus.
- Frontal cortical connections to the thalamus are also essential for maintaining SSR function.
- Thalamic degeneration significantly disrupts autonomic control, highlighting the thalamus's role in autonomic pathways.