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Updated: Feb 24, 2026
Metacarpal Small Incision for Carpal Tunnel Syndrome
Published on: April 5, 2024
Sympathetic skin response in carpal tunnel syndrome
H O Sener1, N F Taşcilar, H Balaban
1Department of Neurology, Ankara University Faculty of Medicine, Ankara, Turkey. osener@dialup.ankara.edu.tr
Objectives:
Sudomotor efferent nerve fiber function was studied in carpal tunnel syndrome (CTS).
Methods:
Bilateral median and ulnar sympathetic skin response (SSR) were recorded by sternal stimulation in 22 bilateral and 9 unilateral patients and compared with 21 healthy volunteers.
Results:
There was no significant difference between median and ulnar nerve SSR latency, amplitude or area. The median nerve SSR was not different from that of the controls. The median-to-ulnar ratios of SSR parameters were not different in patients and controls. However, the median-to-ulnar ratios of SSR amplitude and area were lower than normal in 3 out of 7 patients with normal nerve conduction whereas this abnormality was found in only 4 out of 46 patients with abnormal nerve conduction.
Conclusions:
Normal SSR results, even in patients with complaints related to sudomotor sympathetic dysfunction, indicate that the SSR does not seem to be a sensitive diagnostic method in CTS.
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