简介:Aratmodelofextra-vertebralforamencervicalnerveentrapmentwasestablishedaccordingtothefollowingparameters:stimulationintensity20V;frequency50Hz;pulsewidth200μs;duration333ms/sforatotalof8hours.Aftertheelectricalstimulation,ratsexhibitedmildmusclefiberatrophy,mildinflammatoryexudates,connectivetissuelocalfibrosisandchondrocytemetaplasia.Meanmusclefibercross-sectionalareawasreduced.Thenervemyelinsheathcontinuitywaspartiallydemyelinated.Themicrostructureofnervecellswasdisruptedandthesesymptomsworsenedwithprolongationofthestimulation.Theshoulder,neckandupperextremitymusclesonthetestedsidedemonstratedpositivesharpwavesandfibrillations.Theseverityincreasedwithcontinuationofthestimulation.Highamplitudeandpolyphasicmotorunitpotentialsgraduallyappeared.Similarfindingswereseeninthecontralateralside,butatalessseverelevel.