Clinical neurophysiology : official journal of the International Federation of Clinical Neurophysiology · 2015
Relative sparing of the second lumbrical muscle in carpal tunnel syndrome is not associated with regional differences in axonal membrane potential.
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Paeing Sung Hwha, Kang Mi-Ri, Ahn So-Hyeon, Lee Min Woo, Pyun So Young, Bostock Hugh, Bae Jong Seok
Аннотация
OBJECTIVE: Regional differences in nerve resting membrane potential have been associated with susceptibility to entrapment neuropathy. The aim of this study was to test whether the different susceptibilities to carpal tunnel syndrome (CTS) of median nerve motor axons supplying the second lumbrical (L2) and abductor pollicis brevis (APB) muscles could be explained in this way.
METHODS: Computerized nerve-excitability testing was used to examine the excitability properties of the median motor axons of both L2 and APB in 24 healthy volunteers.
RESULTS: Although some excitability measurements differed between the L2 and APB motor axons, estimates of resting membrane potential (RMP) by model fitting indicated no significant difference between the two groups.
CONCLUSION: Differences in RMP cannot account for the relative sparing of L2 axons in severe CTS.
SIGNIFICANCE: L2 sparing in CTS most likely has an anatomical rather than a biophysical basis.
METHODS: Computerized nerve-excitability testing was used to examine the excitability properties of the median motor axons of both L2 and APB in 24 healthy volunteers.
RESULTS: Although some excitability measurements differed between the L2 and APB motor axons, estimates of resting membrane potential (RMP) by model fitting indicated no significant difference between the two groups.
CONCLUSION: Differences in RMP cannot account for the relative sparing of L2 axons in severe CTS.
SIGNIFICANCE: L2 sparing in CTS most likely has an anatomical rather than a biophysical basis.