Auditory pathways' maturation after cochlear implant via cortical auditory evoked potentials.
BACKGROUND
Evaluation of cortical auditory evoked potentials in children with cochlear implants has been proven to be an effective method for assessing cortical maturation after electrical stimulation.


OBJECTIVE
To analyze the changes in latency values of cortical auditory evoked potentials before and three months after cochlear implant use.


METHODS
This was a case-control study with a group of five children using cochlear implant awaiting activation of the electrodes, and a control group composed of five normal-hearing children. Auditory electrophysiological assessment was performed by the testing of the cortical auditory evoked potentials at two different periods: prior to cochlear implant activation and after three months of cochlear implant use.


RESULTS
A significant decrease in the latency time of the P1 component was observed after three months of stimulation via cochlear implant, whose values were higher than those from the control group. The younger the child was at electrode activation, the greater the reduction in latency of the P1 component.


CONCLUSIONS
Changes in the characteristics of cortical auditory evoked potentials can be observed in children who receive cochlear implants; these changes are related to the age of intervention, suggesting a rapid maturation of the auditory pathways after electrical stimulation.
Faculdade de Medicina, Universidade de São Paulo, São Paulo, SP, Brasil.
Liliane Aparecida Fagundes
LA
Silva
Faculdade de Medicina, Universidade de São Paulo, São Paulo, SP, Brasil.
Maria Inês Vieira
MI
Couto
Divisão de Otorrinolaringologia, Hospital das Clínicas, Faculdade de Medicina, Universidade de São Paulo, São Paulo, SP, Brasil.
Robinson Koji
RK
Tsuji
Divisão de Otorrinolaringologia, Departamento de Oftalmologia e Otorrinolaringologia, Faculdade de Medicina, Universidade de São Paulo, São Paulo, SP, Brasil.
Ricardo Ferreira
RF
Bento
Departamento de Fisioterapia, Fonoaudiologia e Terapia Ocupacional, Faculdade de Medicina, Universidade de São Paulo, São Paulo, SP, Brasil.
Carla Gentile
CG
Matas
Departamento de Fisioterapia, Fonoaudiologia e Terapia Ocupacional, Faculdade de Medicina, Universidade de São Paulo, São Paulo, SP, Brasil.
Ana Claudia Martinho de
AC
Carvalho
D001306:Auditory Pathways / Q000503:physiopathology*; D016022:Case-Control Studies; D002675:Child, Preschool; D003054:Cochlear Implants; D016057:Evoked Potentials, Auditory, Brain Stem / Q000502:physiology*; D006312:Hearing Loss, Bilateral / Q000503:physiopathology / Q000534:rehabilitation*; D006319:Hearing Loss, Sensorineural / Q000503:physiopathology / Q000534:rehabilitation*; D006801:Humans; D007223:Infant; D008297:Male; D011930:Reaction Time; D012720:Severity of Illness Index