Clinical and electrodiagnostic characteristics of nitrous oxide-induced neuropathy in Taiwan

Publication date: October 2016
Source:Clinical Neurophysiology, Volume 127, Issue 10
Author(s): Han-Tao Li, Chun-Che Chu, Kuo-Hsuan Chang, Ming-Feng Liao, Hong-Shiu Chang, Hung-Chou Kuo, Rong-Kuo Lyu
ObjectiveNitrous 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.MethodsWe 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.ResultsWe 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.ConclusionsSevere 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.SignificanceOur study contributes to the understanding of electrodiagnostic features underlying the nitrous oxide-induced neuropathy.



from Physiology via xlomafota13 on Inoreader http://ift.tt/2bSkd78
via IFTTT