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UtilityofMotorEvokedPotentialsforIntraoperativeNerveRootMonitoring

运动诱发电位在术中神经根监测中的应用

作者：MacdonaldDB,StigsbyB,AlHomoudI,AbalkhailT,MokeemA.

来源：JClinNeurophysiol.;29(2):-25

译者：Eason校对：Yuan

METHODOLOGY

研究方法

MuscleMEPmethodologiesaredetailedelsewhere(CalancieandMolano,;Deletis,;Langelooetal.,;Qui?ones–Hinojosaetal.,;MacDonald,;MacDonaldetal.,).Basically,oneappliestranscranialelectricstimulation(TES)throughscalpelectrodesoverlyingmotorcortextoevokemuscleresponses.Pulsetrainstimuliareneededtogenerateenoughcorticospinaltractactionpotentialvolleystomakesomelowermotorneuronsfirethroughtemporalsummationofexcitatorypostsynapticpotentials.Increasingintensityrecruitsadditionallowermotorneurons,butmaximumTESintensity,stillactivatesonlyasubpopulationofmotorunits.Incontrast,singlepulsesreadilygeneratemuscleresponseswhenapplieddirectlytoanerveorrootcontainingmotoraxonsbecauseneuromusculartransmissionneedsnotemporalsummation.Inthiscase,supramaximalintensityrecruitsallthenerve’smotoraxons,andtheresulting