Post Auricular Muscle Response in Auditory Neuropathy

作者：Talaat Hossam Sanyelbhaa; Kabel Abdelmagied Hasan; Khalil Lobna Flamed^*; Said Nithreen Mohammed

来源：Journal of International Advanced Otology, 2010, 6(3): 360-364.

Background and Objective: Auditory neuropathy (AN) is a term used to describe specific hearing disorder with abnormal auditory neural responses in the presence of normal cochlear function. Post Auricular Muscles Response (PAMR) is a sound evoked myogenic potential could be useful for hearing evaluation. Though the exact pathway of the PAMR is not known in human, however it is a brainstem reflex. Theoretically, the absent acoustic reflex in AN may be indicative for abnormal PAMR as well. The aim of this study is to investigate the PAMR in patients with AN.
Materials and Methods: The study group consisted of 20 adult patients with AN while the control group consisted 01 10 normal subjects of matched age and gender distribution.
Results: PAMR response was recorded in the entire control group. The PAMR threshold was within 20 dB SL of the pure tone average of frequencies 1, 2 and 4 kHz in the control group. In contrast all AN patients showed abnormal PAMR response. PAMR was absent in 90% (18/20) of AN patients, and in the remaining 10% (2/20) the response was elicited only on 90 dB nHL stimulus level with delayed peak latency and poor wave morphology.
Conclusions: The PAMR is either absent or abnormal in AN, this prevents its use as an objective tool for hearing assessment in AN. However, PAMR could be an addition for the audiological test battery to detect AN. Further studies is recommended to investigate the neurodiagnostic value of PAMR.

• 出版日期2010