Otoacoustic emissions and effects of contralateral white noise stimulation on transient evoked otoacoustic emissions in diabetic children.
OBJECTIVE
In this study, our aim was to determine presence of dysfunction in the efferent auditory system of children with type-I diabetes mellitus (DM) presenting no evidence of symptomatic neuropathy.


METHODS
Thirty children with type-I DM (DM group) and 31 age matched healthy children (control group) with normal hearing and middle ear function were entered to the study. Distortion product otoacoustic emissions (DPOAE), transiently evoked otoacoustic emissions (TEOAE), and spontaneous otoacoustic emissions (SOAE) measurements were performed. Then, the TEOAE recording was repeated while a continuous broadband white noise (bandwidth: 50-8000 Hz) presented at 40 dB SL was delivered to the contralateral ear for efferent auditory system suppression.


RESULTS
We found that contralateral stimulation (CS) with white noise resulted in significantly more pronounced suppression of the TEOAE response amplitude in healthy controls compared to DM group at 2000 and 4000 Hz frequencies. Further, a relatively higher percentage of the controls had suppression in at least three frequencies compared to DM group. SOAE prevalence was found to be higher in the DM group.


CONCLUSIONS
Our findings suggest presence of a dysfunction in medial olivocochlear efferent system in diabetic children. This may be regarded as an early central manifestation of diabetic neuropathy.
Ugur
Aslihan Kulekci
AK
Gazi University, Faculty of Medicine, ENT Department, Ankara, Turkey. aslihanugur@yahoo.com
Kemaloglu
Yusuf Kemal
YK
Ugur
Mehmet Birol
MB
Gunduz
Bulent
B
Saridogan
Cagil
C
Yesilkaya
Ediz
E
Bideci
Aysun
A
Cinaz
Peyami
P
Goksu
Nebil
N
D000158:Acoustic Impedance Tests; D000161:Acoustic Stimulation / Q000379:methods; D000293:Adolescent; D001299:Audiometry; D001301:Audiometry, Pure-Tone / Q000379:methods*; D001309:Auditory Threshold; D016022:Case-Control Studies; D002648:Child; D003922:Diabetes Mellitus, Type 1 / Q000503:physiopathology*; D006311:Hearing Disorders / Q000175:diagnosis / Q000503:physiopathology; D006801:Humans; D008297:Male; D017084:Otoacoustic Emissions, Spontaneous / Q000502:physiology*; D011446:Prospective Studies; D018709:Statistics, Nonparametric