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Background and Objectives:Hyperacusis is an abnormaly strong reaction which occurs within auditory pathways resul-ting from exposure to moderate sound. More patients are inflicted with it than with tinitus, acounting for a relatively high Among various psychoacoustic evaluations, loudnes discomfort level (LDL) is frequently used in the evaluation of hyperac-usis. Thus, this study aimed to demonstrate a proportion of hyperacusis in tinnitus patients and characterize LDL in hyperacusis and tinnitus patients as a diagnostic test. Materials and Method:Using 186 patients with tinnitus as experiment group and 35 acoustically normal persons as control group, pure tone audiometry (PTA), LDL, and dynamic range (DR) were checked. Results:Amongst the total number of tinnitus patients, there were 10 hyperacusis patients (5.38%) . Those hyperacusis patients had much lower LDL (73.50 dB) and DR (41.50 dB) than tinnitus patients without hyperacusis (LDL:100.90 dB, DR:67.20 dB) as wel as the control group (LDL:104.86 dB, DR:93.98 dB). Conclusion:Hyperacusis patients consist 5.38% (10/186) and have much lower LDL than tinnitus patients without hyperacusis and the control group. There is a po-sitive correlation betwen hyperacusis and LDL. Therefore, in a diagnosis of hyperacusis, it is essential to check LDL and take a careful look into the history from patients. (Korean J Otolaryngol 2002;45:561-8)

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