Download 13th International Conference on Cochlear Implants and Other

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Transcript
P2-6-8
Determining the speech discrimination at the contralateral ear for BAHS using patients
1
2
Celikgun B. , Kalcioglu M.T. , Aksit M.
3
1
Marmara University, School of Medicine, Audiology, Istanbul, Turkey, 2Istanbul Medeniyet University, School of Medicine,
Otorhinolaryngology, Istanbul, Turkey, 3Clinical Specialist, Ankara, Turkey
Purpose and reason: It's known that, when stimulation is given from any point of the head, the stimulation is
heard by the both side of the cochlea. For this reason, it's thought that, the single side usage is enough for the
patient but some suggest that, the bilateral usage is also important. At various studies, different hearing profiles
are examined at bilateral applications. Even some part of these studies are based on an objective measurement,
most of them are the result of the questionnaires. Some of the articles report that, bilateral usage of BAHS is
much more effective whereas some articles report that, there is not any measurable significant difference
between unilateral and bilateral usage. The aim of this study is to determine the effectiveness of the contralateral
ear by measuring the speech discrimination of the patients who use unilateral BAHS at the noisy environment.
Material and method: Twelve BAHS users (8 male, 4 female) with bilateral conductive or mixed hearing loss
were included in this study. For all participants, the followings were determined; air conductive hearing levels
between 250-6000 Hz, masked and unmasked bone conductive HL between 250 - 4000 Hz and speech
discrimination scores (SDS). All patients were using Oticon Medical Ponto Pro and Ponto Pro Power. 8 of the
patients were using at right side, 4 of the patients were using at left side. The loudspeaker was positioned at the
front of the patient with 1 meter distance and 0 azimuth. SDS test was performed by giving single and 3-syllabic
words at quiet environment at the level of 70 db HL. Later, the implanted ear was masked unilaterally with wide
band noise by using insert earphones and the test was repeated. We carefully paid attention to the over masking
and measured the ideal level of the masking for each patient.
Results and discussion: The speech discrimination of the patients were determined and discussed under the
criterion of contralateral unmasked BC thresholds. There has been a positive correlation between the unmasked
bone conduction thresholds of the contralateral ear and it's speech discrimination. Consequently, the
contralateral ear's unmasked thresholds measurement is very important to understand the effectiveness of the
BAHS implementation.
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