الفهرس 
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Abstract
This was a prospective study involving a control group and study group; the control group consisted of (15) subjects were chosen to be age and sex matched with those in the study group. The study group consisted of (50) subjects with VM according to the ICHD-3, 2013 diagnostic criteria. In the control group, age ranged between (22) and (44) years old. They were three males and 12 females. While in the study group age ranged between (23) and (55) years old. They were ten males and 40 females.
The current work was designed to study the different audio- vestibular findings in patients with VM. And the specific aims of the work were assess VOR in the high-frequency horizontal and vertical planes using VAT in VM patients and to analyze the CAEP in VM patients.
Results revealed that 20% of the VM patients have SNHL. 60 % of the VM group had abnormal DPOAEs. VM patients have statistically significant lower amplitude of DPOAEs when compared to the control group at the different F2 frequencies.
No statistically significant difference between the control group and VM group as regards the different ABR parameters (latencies of wave I, III, V, I-III, III-V and I-V inter-peak latencies, shift of wave V at high RR and inter aural latency difference of wave III and V).
No significant effect of frequency in the control group as regards the different CAEP parameters (N1 latency, P2 latency and N1- P2 amplitude). No statistical significant difference as regards CAEP parameters between the two groups at different frequencies
Twenty five percent of ears of VM patients had an absent c-VEMP response. However, there was no statistically significant difference between the two groups as regard the different c-VEMP parameters (P1 latency, N1 latency and P1- N1 corrected amplitude).
The only abnormality in VNG testing was in caloric results. No abnormalities were observed in other VNG test battery. The caloric response was normal and symmetrical in 86% of the VM patients, unilateral canal weakness in 4% of the patients and hyperactive in 10% of the patients (one patient had bilateral hyperactive caloric response).
VAT abnormalities ranged from (10 %) to (56 %) of the study group. The most frequent VAT abnormality was in the vertical gain (56 %), followed by the horizontal gain (54 %) and finally the VAT asymmetry (10 %). The VM group had statistically lower horizontal gain in frequencies higher than 4.7 Hz. Moreover, VM group had lower vertical gain in the frequencies from 2 Hz to 3.9 Hz. On the other hand, no statistical significant difference between the two groups as regards the horizontal and vertical phase.