miércoles, 14 de agosto de 2013

A one year prospective study of hearing loss in diabetes in general population

The objective was to identify whether diabetics have a higher incidence of sensorineural hearing loss than general population and examine its duration and control on severity of hearing loss. Materials: In one year prospective study, 102 Type II diabetic patients and 118 nondiabetic patients of age sex matched were tested on audiometric measures, including pure-tone thresholds. Pure tone averages were calculated initially from each group. Patients were followed for 6 months with repeat evaluation with Pure Tone Audiometry. Result: In the present study there were more male patients in both diabetic and non diabetic and in diabetic patients, there were 76 (74%) cases of sensorineural deafness where as 43 (36%) in non diabetics. Diabetics of more than 5 years of duration are having more hearing impairment 79% as compared with patients with freshly detected diabetics about 42%. In controlled diabetics having SN deafness were 30 whereas in uncontrolled diabetics were 46 (88%). In both groups maximum cases were observed to have moderate type of SN deafness.Uncontrolled diabetic were 1.76 and 1.68 times more risk of high frequency loss as compared to controlled diabetics in BC threshold and AC threshold respectively. Diabetics with more than 5 years in 84 patients had complications like Neuropathy (44%), Nephropathy (29%), retinopathy (25%), and IHD (2%) are having 73% i.e. 2.43 times more risk of SNHL as compared to diabetics without complications. Out of 102 diabetic patients, 62 were followed up for 9 months on treatment and then for HbA1C values.18 patients (29%) had value 6.5 to 7.5, 22 patients (35%) had 7.5 to 8.5, 8 patients (13%) had 8.5 to 10 and 14(23%) had value more than 10. Sensory neural deafness was noted as mild, moderate and severe with respect to HbA1C levels respectively. Conclusion: There is a strong correlation between diabetes and hearing threshold and it is increased in diabetics. Established diabetics are having more hearing impairment as compared to freshly detected diabetics probably due to long duration of diabetes. Uncontrolled diabetics have higher hearing impairment than controlled and as a diabetic complications increases hearing impairment increases.

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