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  Patronage of the Polish Society of Audiology and Phoniatrics

vol 10. no 1. March 2011  

 Original articles
Assessment of progression of functional changes in hearing organ in type 1 diabetes mellitus patients
Katarzyna Augustyn, Mariusz Dąbrowski, Grażyna Mielnik-Niedzielska

Introduction. Diabetes mellitus is a chronic metabolic disorder
that may lead to development of numerous late complications,
such as neuropathy, macroangiopathy, retinopathy, nephropathy.
There is no general agreement on the impact of diabetes mellitus
on hearing function.
Aim. The aim of this study was to assess the changes in hearing
impairment in patients with type 1 diabetes.
Material and methods. Fourteen patients with type 1 diabetes
were included in the study. Changes of hearing threshold
in pure-tone audiometry, otoacustic emission amplitude and
auditory brainstem responses (ABR) were evaluated twice at
6-year interval.
Results. Pure-tone audiometry revealed significant increase of
hearing thresholds at frequency range from 1000 to 8000 Hz
when compared to baseline. In transiently evoked otoacustic
emissions (TEOAE), no significant changes between baseline
and follow-up evaluation were found. In ABR, a trend towards
longer wave V latency was observed. However, this change
didn’t reach the level of statistical significance. No substantial
deterioration of diabetes metabolic control over the study
period was noted.
Conclusion. Significant increase of hearing threshold at middle
and high frequencies without simultaneous decrease of TEOAE
amplitude may indicate that this deterioration is due not only
to ageing, but also to the progression of subclinical diabetic
microangiopathy and neuropathy.

keywords: cukrzyca typu 1, niedosłuch, type 1 diabetes mellitus, hearing loss

pages: from 36 to 41

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