الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
As the main risk factor of tinnitus is HL, and this association is not simple or straightforward as some people with troublesome tinnitus have audiometrically normal hearing and, conversely, many people with hearing loss do not report tinnitus.
The tested hypothesis states that a normal PTA does not reliably preclude cochlear damage. Damage of hair cells coding for frequencies above 8 kHz is not detected by the conventional audiometry. Accordingly, tinnitus patients with normal audiograms had more frequent cochlear dead regions, outer hair cell damage and impaired hearing thresholds in the extended high frequency region, as compared to control groups.
The aim of this study was to assess the role of HFA in the assessment of tinnitus patients, and if it provide relevant additional information in tinnitus patients with normal conventional audiometry.
This study was carried on 20 adults with tinnitus aged up to 50 years old with no sex preference and with normal peripheral hearing sensitivity in frequencies 250-8000 Hz in the audiology unit of Alexandria main university hospital.15 age and sex matched people were enrolled as controls.
Pure tone hearing thresholds at EHFs (9, 10, 11.2, 12.5, 14, and 16kHz) were determined .Thresholds were determined using the ANSI approach. Pitch matching and loudness matching were also done.
Normal HFA thresholds were calculated by using mean +2 SD in the control group. Each age group was calculated separately.
This study concluded that tinnitus with a normal conventional audio-gram does not reflect appreciable cochlear damage in the extended high frequencies.