Sympathetic skin response in Guillain-Barré syndrome.

Dysautonomia is a common feature of Guillain-Barré (GB) syndrome and is sometimes the cause of significant morbidity and death. Changes in sympathetic skin response (SSR) may be one of the accompaniments of dysautonomia. An attempt was made to correlate SSR changes with clinical and electrophysiologic features in a group of 24 patients with GB syndrome fulfilling NINDS (National Institute of Neurological Disorders and Stroke) criteria. A total of nine patients had absent SSR. Thirteen patients had clinical dysautonomia, of whom five had absent SSR. Five patients had features of predominant axonal damage and preserved SSR. A trend towards correlation of SSR abnormalities with common peroneal nerve conduction parameters (velocity and compound muscle action potential amplitude) was noted. We conclude that SSR abnormalities are common in GB syndrome and may be complementary to bed-side tests for autonomic dysfunction.