Mehrali Rahimi, Efat Mashhadi, Ebrahim Karimi,
Volume 10, Issue 3 (6-2007)
Abstract
Introduction: Diabetes mellitus is a chronic disease that has well known effects on most organs, but there have been controversies in few different studies about the effects of diabetes on hearing. So this study was carried out in 2003-2004 in Kermanshah Diabetes Research Center to assess the effect of diabetes on hearing. Materials and Methods: This is a case-control study. 82 diabetic cases (26 types I and 56 type 2 cases) were studied along with 82 controls matched both in age and sex. Cases were selected randomly, their range of age was 15 to 55 years and their duration of diabetes was more than 3 years. After completing questionnaires, all cases and controls undergone autoscopic examination. Those with other ear disease with hearing impairment were omitted. Audiometery including pure tone audiometery, speech audiometery, and impedance audiometrey with well tone AD19 formed was done on 164 (diabetic and control) persons. Data was analyzed using t-test. Results: Audiometric findings with different frequencies in the two groups revealed that there was a significant relationship between diabetes and hearing impairment (p<0.001). This relationship was more significant in high frequencie, older age and type 2 diabetes, but there were no relationship between control of blood sugar (HbA1c), duration of diabetes, sex, microvascular and macrovasculur complications with hearing loss in diabetic patients. Conclusion: These finding demonstrate that diabetes can cause mild to moderate hearing impairment especially in high frequencies. The mechanism of this effect is unknown. Complementary studies with more patients and with more accurate devices such as Otoacustic Emission (OAE) and Audiometric Brainstem Reflex (ABR) are recommended
Maryam Delphi, Mahsa Bakhit, Mojtaba Tavakoli, Ali Nikkhah, Azadeh Saki,
Volume 16, Issue 1 (4-2013)
Abstract
Background: ASSR is the latest threshold detection technology in pediatric audiology. The aim of this study is to investigate the degree to which ASSR thresholds correlate with click-ABR thresholds.
Materials and Methods: In this cross-sectional study, 32 children ranging in age from birth to 7 years were evaluated by ASSR and ABR in moderate to severe and severe to profound hearing loss groups.
Results: The correlation coefficients for frequencies of 500, 1000, 2000, and 4000, mean of 2-4 and mean of 1-4 kHz were between 0.68- 0.90 in moderate to severe hearing loss and 0.79-0.96 in severe to profound hearing loss.
Conclusion: Strong correlations were found between ASSR and click-ABR thresholds in all frequencies. This correlation was greater for higher degrees of hearing loss.
