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The Pure Tone Audiometry and Auditory Brainstem Response in Patients with Small Acoustic Neuroma's
Author(s): 
Pages: 48-51
Year: Issue:  1
Journal: Journal of Audiology and Speech Pathology

Keyword:  Acoustic neuromaPure tone audiometry (PTA)Auditory brainstem response(ABR);
Abstract: Objective To understand the characteristics of the hearing loss in patients with small acoustic neuroma .Methods A retrospective analysis was used to analyze the results of pure tone audiometry (PTA) and au-ditory brainstem response (ABR) in 35 patients (35 ears) diagnosed with small acoustic neuroma .The types of au-diometric curves ,degrees and frequencies of hearing loss and latent periods of ABR were analyzed .Results Moder-ate deafness was the most common type in this study ,with a total of 13 ears (37 .14% ,13/35) .In addition ,8 ears were profound deafness (22 .86% ,8/35) ,7 ears of binaural severe deafness (20 .00% ,7/35) ,6 ears of mild deafness (17 .14% ,6/35) ,and 1 normal ear (2 .86% .1/35) ,respectively .The types of audiometric curves were mainly U -shaped and sloping .15 audiometric curves were U -shaped (42 .86% ,15/35) ,15 sloping (42 .86% ,15/35) ,3 flat (8 .57% ,3/35) ,and 1 tent-shaped (2 .86% .1/35% ) .The main frequencies of hearing loss were 1 kHz ,2 kHz ,4 kHz ,and 8 kHz .The mean thresholds had statistically significant differences (P<0 .05) compared with the other frequencies by S -N -K test .ABR was abnormal in 32 ears(91 .43% ,32/35) .20 of the ears'I - V waves were prolonged or the inter-aural latency difference of V wave was>0 .4 ms .Five ears failed to show any ABR wave , but their 4 kHz pure tone threshold was < 80 dB HL .25 (71 .43% ,25/35)ears'ABR results indicated a retroco-chlear nature of ear disease .Conclusion Moderate deafness is the most common type of hearing loss in small acous-tic neuroma patients ,but only 71 .43% of the patients'ABR indicate a retrocochlear disease ,so an analysis of PTA together with ABR will help to diagnose .
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