Title: A clinical study on hearing impairment caused by mild closed head injury
Abstract: Objective To explore features of hearing impairment caused by mild closed head injury,which would provide some theoretical basis for appraisal in clinical forensic medicine.Methods 51 patients with hearing impairment due to mild closed head injury were recruited.Detailed case histories were recorded.And a series of examinations were carried out,including head or temporal bone CT scanning,otological and neurological examinations.Data from audiologic testing including pure tone audiometry(PTA),acoustic immitance(AT),auditory brainstem response(ABR) and 40Hz auditory event related potential(40Hz AERP) were analyzed.Results Most of the patients after mild closed head injury had sensorineural hearing loss.The degree of hearing loss was mostly ≤ 60dB.While minority had serious hearing loss or mixed deafness.Some of the patients had such clinical manifestations as tinnitus,vertigo,nausea or vomiting etc.All the results abtained from auditory examination at different periods after injury were significantly different from those of control patients(P0.05).Hearing loss was detected obviously in the high-frequency range.For ABR in injury group as compared with that in control patients,there were significant deviations(P0.05) for latency period of wave and interpeak latency at Ⅲ~Ⅴ wave and Ⅰ~Ⅴwave except for interpeak latency of Ⅰ~Ⅲ wave(P0.05).Conclusion Mild closed head injury may cause high-frequency hearing loss and functioning impairment of brain stem to some extent with vestibular dysfunction in some cases,suggesting that labyrinth concussion of the inner ear play an important role in combination with clinical symptom and auxiliary examinations.
Publication Year: 2010
Publication Date: 2010-01-01
Language: en
Type: article
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