Abstract
Aim and Objectives : To evaluate functional integrity of Outer
Hair Cells and Medial Olivocochlear system in the subjects having
normal
hearing with tinnitus and compare it with normal population and also to
study the importance of Otoacoustic Emissions testing as an important
objective tool in tinnitus evaluation.
Methods and Materials: A total of 20 subjects in the age range
of 18 years to 57 years were considered for the study. They were
categorised
into two groups such as experimental group and control group.
Experimental group consisted of 14 subjects with normal hearing having
unilateral or bilateral tinnitus. The control group consisted of 6 age
matched subjects having normal hearing without any tinnitus. All the
subjects of both the groups underwent Pure Tone Audiometry testing and
tinnitus evaluation. TEOAE testing and Contralateral Suppression of
TEOAE were carried out.
Results: Among the 19 ears in the experimental group, TEOAE
was absent in 10 ears (52.6%) and present in 9 ears (47.3%). Presence of
contralateral suppression of TEOAE was observed in 6 ears (31.5%) and
absence of contralateral suppression was noted in 13 ears (68.4%).
It can be observed that most of patients in the experimental group had
absent TEOAE and there is a subtle difference in the contralateral
suppression of TEOAE between the experimental and control group.
Conclusion: In conclusion abnormal OAE in patients with
tinnitus having normal hearing sensitivity indicate the cochlear
dysfunction. Absence
of suppression indicates Medial Olivocochlear system dysfunction. We
also suggest that other auditory structures and mechanisms apart from
OHC and MOC system may also be the reason for tinnitus generation as the
results included patients with normal OAE and Contralateral
suppression of OAE.The study helps to understand the role of OAE
measures in evaluating the functional integrity of Outer Hair Cells and
MOC
system in subjects having tinnitus with normal hearing. It also
highlight about the role of MOC system and cochlea in the generation of
tinnitus.
Contralateral Suppression Of Teoae In Patients With Tinnitus and Normal Hearing by Kamala Sarathy in BJSTR
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