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© 1999 American Academy of Neurology Articles Sympathetic skin response differentiates hereditary sensory autonomic neuropathies III and IVFrom the Department of Neurology (Drs. Hilz and Axelrod), New York University Medical Center, NY; the Department of Neurology (Dr. Stemper), University of Erlangen-Nuremberg, Erlangen, Germany; and the Dysautonomia Treatment and Evaluation Center (Dr. Axelrod), New York, NY. Address correspondence and reprint requests to Dr. Max J. Hilz, Department of Neurology, New York University Medical Center, 550 First Avenue, Suite NB 7W11, New York, NY 10016. OBJECTIVE: To evaluate whether sympathetic skin response (SSR) differs in patients with hereditary sensory autonomic neuropathy (HSAN) types III and IV. BACKGROUND: HSAN types III and IV are rare autosomal recessive disorders that cause many similar autonomic, sensory, and motor dysfunctions, but different sweating characteristics. HSAN III patients have preserved and at times, excessive sweating, whereas anhidrosis is characteristic of HSAN IV. SSR reflects the integrity of sympathetic sudomotor fibers and the activation of sweat glands through the change in skin resistance in response to an arousal stimulus. Therefore, SSR is a test method that might facilitate differential diagnosis of HSAN III and IV. METHODS: In 17 HSAN III patients (eight women, nine men; mean age, 20.65 ± 5.45 years) and seven HSAN IV patients (five girls, two boys; mean age, 10.0 ± 5.45 years) SSR was recorded from the palms and soles after repeated electrical, acoustic, and inspiratory gasp stimulations. In addition, all subjects underwent a neurologic examination; studies of median, peroneal motor, and sural nerve conduction velocities; and determination of vibratory and thermal perception thresholds. RESULTS: Although clinical differences were appreciated between the two types of HSANs, both HSANs had evidence of small-fiber involvement. Both HSANs had abnormal temperature and pain perception. In contrast, SSR was preserved in all HSAN III and absent in all HSAN IV patients. CONCLUSION: SSR provides another parameter to improve differentiation of HSAN III from HSAN IV, and also gives us additional information regarding sympathetic sudomotor fiber function in these developmental diseases. This article has been cited by other articles:
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