title: Effect of coexistent carpal tunnel abnormality on sensory conduction findings in polyneuropathy.
abstract: OBJECTIVE
  To investigate the change of pattern of sensory conduction findings in polyneuropathy with coexistent carpal tunnel abnormality (CTAbN).
  
  
  METHODS
  We reviewed sensory conduction findings of 46 patients with acute inflammatory demyelinating polyradiculoneuropathy (AIDP) and 66 with diabetic polyneuropathy (DP). Both groups were categorized into those with and without CTAbN according to transcarpal median sensory conduction velocities.
  
  
  RESULTS
  In AIDP, median sensory nerve action potential (SNAP) amplitudes were reduced, whereas sural SNAP amplitudes remained unchanged. Median SNAP amplitude was lowest, and sural/median SNAP amplitude ratio was highest in AIDP with coexistent CTAbN. In DP, both median and sural SNAP amplitudes were reduced. Their sural/median SNAP amplitude ratios remained unchanged. Incidence of abnormal median-normal sural pattern was higher in AIDP than in DP. Nevertheless, these incidences did not alter with coexistent CTAbN. The ulnar SNAP amplitude and sural/ulnar SNAP amplitude ratio were not significantly different between those with and without CTAbN in both AIDP and DP groups.
  
  
  CONCLUSIONS
  Coexistent CTAbN caused further increase of sural/median SNAP amplitude ratio only in AIDP.
authors.affiliation: Section of Neuromuscular Disease, Department of Neurology, Chang Gung Memorial Hospital Linkou Medical Center and Chang Gung University Medical College, Taoyuan, Taiwan.
authors.forename: Rong-Kuo
authors.initials: RK
authors.lastname: Lyu
authors.forename: Ming-Feng
authors.initials: MF
authors.lastname: Liao
authors.forename: Hung-Chou
authors.initials: HC
authors.lastname: Kuo
authors.forename: Chun-Che
authors.initials: CC
authors.lastname: Chu
authors.forename: Kuo-Hsuan
authors.initials: KH
authors.lastname: Chang
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002349:Carpal Tunnel Syndrome / Q000150:complications* / Q000503:physiopathology*; D003929:Diabetic Neuropathies / Q000150:complications* / Q000503:physiopathology*; D004576:Electromyography; D005260:Female; D020275:Guillain-Barre Syndrome / Q000150:complications* / Q000503:physiopathology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D055815:Young Adult