title: Clinical and electrodiagnostic characteristics of nitrous oxide-induced neuropathy in Taiwan.
abstract: Nitrous oxide-induced neuropathy is toxic neuropathy occasionally encountered in Taiwanese neurological clinics. Only several case reports described their electrodiagnostic features. We used a case-control design to investigate the detailed electrodiagnostic characteristics and possible factors relating to severe nerve injury.
  
  
  
  We retrospectively reviewed 33 patients with nitrous oxide-induced neuropathy over a 10-year period and reported their demographic data, spinal cord MRI, laboratory examinations and nerve conduction studies. 56 healthy controls' nerve conduction studies were collected for comparison analysis.
  
  
  
  We noted significant motor and sensory amplitudes reduction, conduction velocities slowing, and latencies prolongation in most tested nerves compared to the controls. Similar nerve conduction study characteristics with prominent lower limbs' motor and sensory amplitudes reduction was observed in patient groups with or without abnormal vitamin B12 and/or homocysteine levels. Among those with lower limbs' motor or sensory amplitudes reduction <20% of the lower limit of normal, higher homocysteine levels were detected.
  
  
  
  Severe impairments of the lower limbs' sensory and motor amplitudes were frequently noted in patients with nitrous oxide exposure. Nitrous oxide exposure itself is an important factor for the development of neuropathy.
  
  
  
  Our study contributes to the understanding of electrodiagnostic features underlying the nitrous oxide-induced neuropathy.
authors: Department of Neurology, Chang Gung Memorial Hospital Linkou Medical Center, Chang Gung University College of Medicine, Taoyuan, Taiwan.
authors: Han-Tao
authors: HT
authors: Li
authors: Department of Neurology, Chang Gung Memorial Hospital Linkou Medical Center, Chang Gung University College of Medicine, Taoyuan, Taiwan.
authors: Chun-Che
authors: CC
authors: Chu
authors: Department of Neurology, Chang Gung Memorial Hospital Linkou Medical Center, Chang Gung University College of Medicine, Taoyuan, Taiwan.
authors: Kuo-Hsuan
authors: KH
authors: Chang
authors: Department of Neurology, Chang Gung Memorial Hospital Linkou Medical Center, Chang Gung University College of Medicine, Taoyuan, Taiwan.
authors: Ming-Feng
authors: MF
authors: Liao
authors: Department of Neurology, Chang Gung Memorial Hospital Linkou Medical Center, Chang Gung University College of Medicine, Taoyuan, Taiwan.
authors: Hong-Shiu
authors: HS
authors: Chang
authors: Department of Neurology, Chang Gung Memorial Hospital Linkou Medical Center, Chang Gung University College of Medicine, Taoyuan, Taiwan.
authors: Hung-Chou
authors: HC
authors: Kuo
authors: Department of Neurology, Chang Gung Memorial Hospital Linkou Medical Center, Chang Gung University College of Medicine, Taoyuan, Taiwan. Electronic address: lyu5172@adm.cgmh.org.tw.
authors: Rong-Kuo
authors: RK
authors: Lyu
mesh_terms: D000328:Adult; D016022:Case-Control Studies; D005260:Female; D006801:Humans; D008297:Male; D009046:Motor Neurons / Q000502:physiology; D009431:Neural Conduction; D009609:Nitrous Oxide / Q000633:toxicity*; D010523:Peripheral Nervous System Diseases / Q000175:diagnosis* / Q000209:etiology / Q000503:physiopathology; D011984:Sensory Receptor Cells / Q000502:physiology
chemical_list: D009609:Nitrous Oxide
keywords: Electrodiagnosis; Homocysteine; N(2)O neuropathy; Nerve conduction study; Nitrous oxide-induced neuropathy; Toxic neuropathy