الفهرس 
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Abstract
Dizziness and vertigo are common chief complaint, however, the cause often remains unexplained (Hannelore et al 2008). It arises because of asymmetry in the vestibular system due to damage to or dysfunction of the labyrinth, vestibular nerve, or central vestibular structures in the brainstem. Vertigo is a troubling problem for many clinicians because it is symptomatic of a large range of diagnoses from benign to immediately life threatening. An accurate diagnosis is important to exclude potentially serious central causes of vertigo, and to aid successful treatment.
The neurotological investigation is based on procedures used for investigating auditory and vestibular disorders in order to obtain information which may contribute to the diagnosis of labyrinthine changes (Ganança. 1999)
An abnormal ABR offers reliable evidence for brainstem lesion and is thus a useful examination in dizziness (Ojala et al 1988).
This study was conducted to describe the results from the otoneurological assessment of patients with vestibulocochlear complaints, normal peripheral hearing individuals and patients with mild to moderate SNHL compared them to a control group.
This study was carried in the audiology unit, ENT Department, Assiut University Hospital. The study group consisted of 40 patients divided into two subgroups. Subgroup A composed of 20 patients with vestibular complaints and normal peripheral hearing, subgroup B composed of 20 patients with vestibular complaint and mild to moderate SNHL, and 15 subjects in the control group without vestibular complaint and with normal peripheral hearing.
The equipment used were sound treated room IAC Moldle 1602, two channel audiometers Orbiter 922, impedance bridge Interacoustics AZ7, 4-Channel ENG micromedical. The ABR recording was done with Nicolet Spirit version 2.
All study patients were submitted to full history, otological examination, basic audiological evaluation, neurological examination, ENG test battery and ABR were obtained from all subjects (study and control groups).
Results in the current study, when comparing the studied vertigo patients with a normal control sample, it was found that absent wave I was recorded in both subgroups (A, B). Statistic significantly increased absolute latencies of waves I, III, and V by low and high repetition rates. Also, a significant prolongation were found in the interpeak latencies values I-III, III-V, at low or high repetition rates in both subgroups when compared to the control group and I-V prolongation was recorded in one ear at high repetition rate in subgroup B when compared to the control and subgroup A.
Discussion of the results concluded that ABR gives valuable information concerning the localization of the process in many patients with vertigo. It is thus a useful tool in the search for an organic etiology of vertigo.