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Lidocaine Unmasks Silent Demyelinative Lesions in Multiple Sclerosis
Neurol 42:2088-2093, Sakurai,M.,et al, 1992
See this aricle in Pubmed

Article Abstract
Blockage of a small number of sodium channels may prevent impulse conduction in some demyelinated segments of nerve fibers with low safety factors,thereby unmasking subclinical demyelinative lesions.On the basis of this hypothesis,lidocaine,a sodium channel blocker,was administered intravenously to 28 MS patients and to 19 normal subjects and seven patients with nondemyelinating diseases.As predicted,lidocaine(mean plasma level,2.7 ug/ml)elicited reversible subclinical symptoms in 23 of the MS patients,but it had no effect on the control subjects.We made a quantitative study of the visual functions(visual acuity,color vision, visual evoked potential[VEP])that were impaired in 15 MS patients.Of the 23 affected eyes,nine showed normal VEPs,indicative of the test's sensitivity to focal lesions.This test should be useful in the diagnosis of MS and in the evaluation of the subclinical activity of MS as well.
 
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asymptomatic
color vision
color vision,impaired
demyelinating disease
lidocaine
multiple sclerosis
multiple sclerosis,asymptomatic
multiple sclerosis,diagnosis of
optic nerve,lesion of
transient neurologic deficit
visual acuity
visual acuity,decreased
visual evoked response

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