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Small-fibre Neuropathy in Patients with Familial Amyotrophic Lateral Sclerosis Type 8. | LitMetric

AI Article Synopsis

Article Abstract

Background: Amyotrophic lateral sclerosis (ALS) is a degenerative disease of the nervous system that primarily affects motor neurons. ALS type 8 (ALS8) is a familiar form with predominant involvement of lower motor neurons, tremor, and slow progression.

Objective: The aim of this study was to describe sensory involvement in a cohort of ALS8 patients and compare it with the characteristics of sporadic ALS (sALS) patients and controls.

Methods: We compared data from 40 ALS8 and 10 sALS patients assessed by neurological evaluation and electrophysiological study. Skin biopsies were performed in these patients and 12 controls for analysis of intraepidermal nerve fiber (IENF) density by protein gene product 9.5 (PGP 9.5) immunohistochemistry.

Results: The ALS8 group was younger than the sALS group at the onset of symptoms ( < 0.05) and had a longer disease evolution ( < 0.01). Sensory abnormalities were evident in 35% of the ALS8 and 30% of the sALS patients by neurological examination, and all ALS patients presented normal sensory nerve action potentials. Despite being similar in the ALS8 and sALS groups, IENF density in the ALS8 group was lower than that in the controls ( < 0.0005). In the ALS8 group, IENF density was significantly lower in patients with impairment of vibratory sensation than in those without this finding ( < 0.05) and in females than in males ( < 0.05).

Conclusion: Sensory impairment and decreased IENF density are present in ALS8 patients at a frequency and intensity similar to that in the sALS group.

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http://dx.doi.org/10.1017/cjn.2022.331DOI Listing

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