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Spatialpatternofneuralexcitationmeasuredonelectrodebandofcochlearimplant
XIXinHONGMengdiJIFeiRANDongyiYANGWeiyan
DepartmentOtorhinolaryagologychiaesePIAGeneralHospiral100853BeijingChina
[Abstract)Objective:Tofindanobjectiveandnon/?invadingmethodtoevaluatethefunctionofsurvivalauditorynerve
fibersbymeasuringthespatialneuralexcitationpatternproducedbyeachbandoftheelectrodearmyincochlearimplant
recipients.Method:NeuralResponseTelemetry(NRT)softwarewasappliedtorecordtheelectricalevokedcompound
actionpotential(ECAP)in20recipients.Thissoftwareimplementsanartifactsubtractiontechniquethatrequirespre-
sentationoftwobiphssiccurrentpulses.Thepurposeofmaskeristodrivethenerveintoarefractorystate.Rmaskerpulse
andprobepulsearegiventodifferentelectrodesthroughthecochleaneuralexcitationpatternsofeachelectrodecanbe
gotten.Results:Allelectrodesshowedoneofbothtwoexcitationpatterns:typ
eIhasBell/?shapecurve,typeRhasa
shallowslopeofthecurveatthehigh/?frequencyside.Thepatternbecomesbroaderwiththeincreaseofcurrentstimuli
intensity.Theneuralexcitationpatternsproducedbyelectrodesthroughoutthecochleaobviouslyoverlap.Thefeaturesof
spatialdistributionofexcitationpatternrecorded??the5th,10th,15thelectrodecanbeclassifiedasA.B.C.category
Thereisobviousrelationbetweenthecategoryofneuralinteractionandthedurationofprofoundhearingloss.Conclusion:
Thespatialneuralexcitationpatterns,whicharecomposedbyagroupoffilters,areverysimilartothetuningcurveof
auditoryneuralactivitywithinthecochlea.Therelationbetweenspatialpatternsanddurationofhearinglosssuggeststhat
neuralexcitationspatialpatternsallowsomedeductionsaboutthepercentageofneuralsurvival
Keywords:cochlearimplantaA/?excitation
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