[Comparative study between auditory steady-state responses, auditory brain-stem responses and liminar tonal audiometry].
OBJECTIVE
Auditory steady-state responses (ASSR) using frequencies of modulation between 70-110 Hz are a new auditive exploration technique. The aim of the study was to evaluate the contribution of the ASSR to diagnostic of the audition.


METHODS
Different aportations of auditory steady-states responses (ASSR) and auditory brain-stem responses (ABR) to diagnostic of threshold of audition were studied Differences between these thresholds and thresholds obtained by liminar tonal audiometry (LTA) were studied too. Correlations between thresholds obtained by ASSR and LTA were studied.


RESULTS
ASSR detected rest of audition that transients ABR did not detect. Differences about -13.750 dB HL (-5.209 to -22.291) and -13.250 dB HL (-7.337 to -19.163) were found between registered values for carriers of 500 and 1000 Hz and the thresholds by LTA for these carriers. Differences about 1.625 dB HL (-6.967 to 10.217) and -2.875 dB HL (-7.446 to 1.696) were found between estimations for the carries of 500 and 1000 Hz and thresholds by TLA. Statistically very significant (P=.01) coefficients of correlation were found between registered and estimated thresholds by ASSR for carrier of 500 and 1000 Hz and threshold by TLA for these frequencies.


CONCLUSIONS
Auditory steady-state responses (ASSR) using frequencies of modulation between 70-110 Hz are a new auditive technique of exploration. This stimulus is more frequency-specific than clicks for auditory brain-stem responses (ABR). Response is not modificated by steady of consciousness. The technique is doublely objective. Thresholds obtained by ASSR permits to estimation of the audition threshold.
Servicio de Otorrinolaringología, Hospital Santa Bárbara, Puertollano, Ciudad Real, España. miguelaaf@msn.com
Asunción
A
Martínez Fernández
Miguel Angel
MA
Alañón Fernández
Luis Félix
LF
Ayala Martínez
Ana Belén
AB
Alvarez Alvarez
María Teresa
MT
Miranda León
Manuel
M
Sainz Quevedo
D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001301:Audiometry, Pure-Tone / Q000379:methods*; D001307:Auditory Perception / Q000502:physiology*; D005072:Evoked Potentials, Auditory / Q000502:physiology; D016057:Evoked Potentials, Auditory, Brain Stem / Q000502:physiology*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged