Introduction: The diagnostic criteria for amyotrophic lateral sclerosis (ALS) require normal sensory nerve conduction studies (NCS) or abnormal NCS only in the presence of neuropathy of identified etiology. In this study, we investigated the presence and extent of involvement of Aß sensory fibers in ALS.
Methods: Distal sensory NCS [antidromic dorsal sural (DS) and orthodromic medial plantar (MP)] and conventional sensory NCS (unilateral median sensory and bilateral sural nerves) were performed in 16 definite and 2 probable ALS patients (based on Awaji criteria) and 31 controls.
Results: Abnormal conventional sensory NCS were found in 8 (44.4%) ALS patients and 1 (3.2%) control subject (P = 0.002), whereas abnormal distal sensory NCS were found in 12 (66.7%) ALS patients and 3 (9.6%) controls (P < 0.0001).
Conclusion: Distal sensory NCS were more often abnormal than conventional sensory NCS in ALS. Muscle Nerve 54: 1086-1092, 2016.
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