Electromyography and clinical neurophysiology
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Electromyogr Clin Neurophysiol · Oct 1993
Autonomic system dysfunction in moderate diabetic polyneuropathy assessed by sympathetic skin response and Valsalva index.
30 patients with moderate diabetic polyneuropathy (Stage 2 according to Dyck) were evaluated for autonomic symptoms, sympathetic skin response (SSR) and Valsalva index. Their SSR were compared to a control group of 30 healthy normal subjects. Neuropathy was confirmed by history, clinical examination and nerve conduction measurements. ⋯ SSR amplitudes were significantly lower in diabetics (changed in 53%, absent in 20%) than in the controls. SSR abnormality correlated to some clinical and electroneurographic signs of neuropathy, suggesting similar affection of sympathetic and somatic fibres. Valsalva index was abnormal in 37% of patients showing no correlation to clinical, electroneurographic or SSR changes.