The axonal carpal tunnel syndrome.
Five patients with typical unilateral carpal tunnel syndrome features were studied. Each patient had a normal electrodiagnostic evaluation, including needle examination (C5 to C8T1), distal motor latency, palm to wrist orthodromic sensory conduction velocity, and special tests: median-ulnar latency difference of the 4th digit, palmar centimetric technique. Only a new test, the orthodromic sensory ultra distal test of all the digits, revealed a significant axonal loss (60-90%) in at least two median digits allowing the diagnosis of median nerve impairment. These findings led us to propose the term, axonal carpal tunnel syndrome for this early stage of the disorder.
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Laboratoire d'Electromyographie, Paris, France.
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001369:Axons / Q000473:pathology* / Q000502:physiology; D002349:Carpal Tunnel Syndrome / Q000503:physiopathology*; D004594:Electrophysiology; D005260:Female; D005385:Fingers / Q000294:innervation; D006225:Hand / Q000294:innervation; D006801:Humans; D008297:Male; D008475:Median Nerve / Q000503:physiopathology; D008875:Middle Aged; D009431:Neural Conduction / Q000502:physiology