[Analysis of the distortion product otoacoustic emission (DPOAE) and input/output function (I/O) in tinnitus patient with normal hearing].
Distortion Product Otoacoustic Emission (DPOAE) has been used as a tool to determine the presence of cochlear pathology. It is well known that the damage of Outer Hair Cells (OHCs) results in reduced auditory sensitivity and generation of tinnitus. At the same time tinnitus arises in normal hearing persons as well. The aim of this study was the assessment of the DPOEA amplitude and the behavior of DP I/O function in tinnitus patients with normal hearing threshold. The group of 48 tinnitus patients (92 ears) with normal hearing threshold and the control group of 30 normal hearing patients (40 ears) were investigated for this study. All subjects have undergone the measurement of DPOAE and DP I/O functions for frequencies: 1000, 2000 and 4000 Hz. In the tinnitus group there were observed the decrease in DPOAE amplitude for some frequencies and the steeper slope of I/O function. This means that the places with localized damage or dysfunction of OHCs on the basilar membrane can be responsible for the origin of tinnitus.
Bartnik
Grazyna
G
Klinika Szumów Usznych Instytutu Fizjologii i Patologii Słuchu w Warszawie.
Rogowski
Marek
M
Fabijańska
Anna
A
Raj-Koziak
Danuta
D
Borawska
Beata
B
D000328:Adult; D001309:Auditory Threshold / Q000502:physiology; D005260:Female; D006309:Hearing / Q000502:physiology*; D006801:Humans; D008297:Male; D017084:Otoacoustic Emissions, Spontaneous / Q000502:physiology*; D012720:Severity of Illness Index; D014012:Tinnitus / Q000175:diagnosis* / Q000503:physiopathology*