Vol.99 No.3 contentsPRACTICA OTO-RHINO-LARYNGOLOGICA
Vol. 99 No. 3 March 2006
Evaluation of the Audiometric Usefulness of the Auditory Steady-state
Response Using the Multiple Auditory Steady-state Response
Makiko Takeda, Fumiko Hata, Kensaku Hasegawa and Hiroya Kitano
(Tottori University)
Takema Sakoda
(Wakayama Nisseki Medical Center)
Objective: To evaluate the audiometric usefulness of the auditory steady-state response (ASSR) using the multiple auditory steady-state
response (MASTER®).
Design: ①In normal adults (aged 25-45 years old), comparisons of the behavioral thresholds for pure tones and the ASSR thresholds
were compared. ②In supposedly normal infants (aged 3-45 months old), the click ABR thresholds and ASSR thresholds
were compared. ③In patients (aged 6-81 years old), the behavioral thresholds for pure tones, the ASSR thresholds, and click ABR
thresholds were compared.
Results: ①In normal adults, the behavioral thresholds for pure tones of 0.5, 1, 2, and 4 kHz were 9.7±4, 7.8±3.5, 8.9±5, and 6.1±6.3 dB, respectively. In addition, the ASSR thresholds for carrier frequencies of 0.5, 1, 2, and 4 kHz were 40.6±9.4, 33.9±7, 29.4±5.4, and 32.8±4.6 dB, respectively.
②In the infants, the click ABR thresholds were 20±7.3 dB, while the ASSR thresholds for carrier frequencies of 0.5, 1, 2, and 4 kHz were 55±9.3, 44.4±13.9, 34.8±11.6, and 40.7±14.4 dB, respectively.
③In the patients, correlation coefficients of behavioral thresholds and ASSR thresholds were 0.65 at 0.5 kHz, 0.85 at 1 kHz, 0.82 at 2 kHz, and 0.77 at 4 kHz. The correlation coefficients of behavioral thresholds and click ABR thresholds were 0.80 at 0.5 kHz, 0.86 at 1 kHz, 0.90 at 2 kHz, and 0.83 at 4 kHz.
Conclusion: On average, the thresholds for the ASSR were higher than the behavioral thresholds, and the discrepancies were larger at low frequencies. For a better physiologic audiometry estimation of the lower frequencies, the optimal modulation frequency should be investigated.
Key words :
auditory steady-state response (ASSR), ABR, pure tone audiometry