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Abstract
Evoked potential thresholds using the 40 Hz auditory steady-state response (ASSR) and cortical auditory evoked potential (CAEP) were recorded at 500 Hz and 4000 Hz test frequencies in 36 subjects with normal acuity, and 30 subjects with sensorineural hearing loss. ASSR threshold sensation levels (SLs) were lower in ears with greater degrees of hearing loss, and for the 500 Hz stimulus. Mean SLs (maximum duration of a single recording: 89 seconds) were as follows at 500 Hz and 4000 Hz respectively: normal hearing group, 16.9±10.3 dB and 42.4±14.4 dB; mild-moderate group, 10.6±8.8 dB and 23.8±8.1 dB; severe-profound group, 10.0±13.2 dB and 21.5±18.9 dB. CAEP SLs showed no change with hearing level and CAEP/behavioural differences were similar at each test frequency. Mean SLs for CAEP threshold (single recording duration: 84 seconds) at 500 Hz and 4000 Hz respectively were: normal hearing group, 10.3±6.4 dB and 11.5±3.8 dB; mild-moderate group, 8.4±7.4 dB and 13.2±12.4 dB; severe-profound group, 11.0±6.6 dB and 15.9±16.4 dB. The results of this study suggest that while both 40 Hz ASSR and CAEP can reflect the behavioural audiogram, CAEPs may provide a more reliable estimate of hearing in awake adults.
| Acronyms | ||
| ASSR | = | Auditory steady-state response |
| CAEP | = | Cortical auditory evoked potential |
| Acronyms | ||
| ASSR | = | Auditory steady-state response |
| CAEP | = | Cortical auditory evoked potential |
Sumario
Se registraron los umbrales de potenciales evocados de estado estable con 40 Hz (ASSR) y auditivos corticales (CAEP) con frecuencias de prueba de 500 y 4000 Hz en 26 normooyentes y en 30 hipoacúsicos sensorineurales. Los niveles de sensación (SL) de umbrales ASSR fueron más bajos en los oídos con mayores grados de pérdida y con el estímulo de 500 Hz. Los SL promedio (máxima duración de un registro sencillo: 89 segundos) con 500 Hz y 4 kHz, respectivamente fueron: normooyentes, 16.9±10.3 dB y 42.4±14.4 dB; problemas leves/moderados,10.6±8.8 dB y 23.8±8.1 dB y problemas severos/profundos, 10.0±13.2 dB y 21.5±18.9 dB. Los SL de los CAEP no mostraron cambios en cuanto el nivel auditivo y las diferencias conductuales con los CAEP fueron similares en cada frecuencia probada. Los SL promedio para los umbrales de los CAEP (duración de un registro sencillo: 84 segundos) en 500 Hz y 4 kHz, respectivamente, fueron: normooyentes, 10.3±6.4 dB y 11.5±3.8 dB; problemas leves/moderados, 8.4±7.4 dB y 13.2±12.4 y problemas severos/profundos, 11.0±6.6 dB y 15.9±16.4 dB. Los resultados de este estudio sugieren que en tanto los ASSR a 40 Hz y los CAEP pueden reflejar el audiograma conductual, los CAEP proveen una estimación más confiable de la audición en adultos despiertos.