聽力檢查正常之耳鳴者的隱性聽覺功能障礙：中年成人呈現具選擇性且病程依賴性的聽性腦幹反應（ABR）變化

// Hidden auditory dysfunction in tinnitus with normal audiograms: selective and chronicity-dependent ABR changes in middle-aged adults

74名耳鳴(急<6月/慢≥6月)，測ABR(腦幹聽覺反應)｜純音/DPOAE無差，但I波在55–80dB潛伏延長，45dB時I波振幅減；慢性有V波延遲斜率陡、80dB V/I↑｜結論：正常聽力耳鳴聽神經I波異常，慢性伴腦幹超閾，助診斷治療

// This study tested whether middle-aged adults with tinnitus but clinically normal hearing show peripheral neural dysfunction and duration-related brainstem changes. Click-evoked auditory brainstem responses (45–90 dB nHL) were recorded in 74 tinnitus patients (acute <6 months, chronic ≥6 months) and 15 controls, analyzing wave latencies, amplitudes, interpeak latencies, intensity slopes, and V/I ratios. Pure-tone thresholds and DPOAEs did not differ, but chronic tinnitus showed prolonged wave I latency at 55, 75, and 80 dB and both acute and chronic tinnitus had reduced wave I amplitude at 45 dB; chronic cases also showed a steeper wave V latency-intensity slope and higher V/I ratio at 80 dB. The findings point to selective auditory nerve (wave I) abnormalities in normal-audiogram tinnitus with additional suprathreshold brainstem changes in chronic tinnitus.

Published 2026年8月31日