Middle latency response study of auditory evoked potentials amplitudes and lantencies audiologically normal individuals.
Contemporary cohort cross-sectional study.


BACKGROUND
The auditory middle latency response (AMLR) is generated between 10 and 80 ms and has multiple generators, with a greater contribution from the thalamus-cortical pathways. The establishment of normality criteria for latency and amplitude values is necessary for clinical use.


OBJECTIVE
to analyze the latency and amplitude of the AMLR in individuals without audiological disorders, and verify the reliability of Pa-Nb amplitude.


METHODS
The AMLR of 25 individuals was collected during 2005 and the Na, Pa, Nb components were analyzed for each tested ear (A1 and A2), and electrode positioning (C3 and C4).


RESULTS
A statistically significant difference was noticed among middle latency values for C3A1 and C4A1 regarding components Na and Pa, and no difference for component Nb and mean values for amplitudes Na-Pa and Pa-Nb.


CONCLUSIONS
We established average and standard deviation values for latency and amplitude parameters for components Na, Pa, Nb and Na-Pa and Pa-Nb, under conditions C3A1, C4A1, C3A2, C4A2, providing a parameter for the analysis and interpretation of this potential.
Neves
Ivone Ferreira
IF
FMUSP, São Paulo, SP, Brazil.
Gonçalves
Isabela Crivellaro
IC
Leite
Renata Aparecida
RA
Magliaro
Fernanda Cristina Leite
FC
Matas
Carla Gentile
CG
D000328:Adult; D015331:Cohort Studies; D003430:Cross-Sectional Studies; D005072:Evoked Potentials, Auditory / Q000502:physiology*; D005260:Female; D006801:Humans; D008297:Male; D011930:Reaction Time / Q000502:physiology*; D012015:Reference Standards; D015203:Reproducibility of Results