[[alternative]]Mandarin Hearing in Noise Test in Patients with Unilateral Conductive Hearing Loss

[[abstract]]本研究探討單側傳導性聽力損失患者在吵雜環境下的語音聽辨力，研究使用台灣版噪音下漢語語句聽辨測試(MHINT-T)配合聲場喇叭進行測試。總共四十二位受試者參與本研究，其中二十五位為正常聽力之對照組，十七位為單側傳導性聽損之實驗組。實驗組依兩耳的聽力程度不同分為優耳及劣耳。研究分別測試實驗組及對照組在安靜環境下之百分之五十語句聽辨率(RTS)及噪音從不同方向來之語音聽辨訊噪比。研究結果顯示，對照組在安靜環境下的語句聽辨閾值平均為22.5 dBA (SD = 2.54 dB)，噪音在前的施側環境下，訊噪比平均在-6.9 dB (SD = 0.95 dB)可達百分之五十的語句聽辨率。噪音在右時，訊噪比平均-15.7 dB (SD = 1.19 dB)及噪音在左時，訊噪比平均-12.6 dB (SD = 1.85 dB)分別可達百分之五十的語句聽辨率。噪音複合(noise composite)的結果為-10.6 dB (SD = 0.95 dB)。實驗組在安靜環境下的語句聽辨閾值平均為29.9 dBA (SD = 3.54 dB)，噪音在前的施測環境下，訊噪比平均在-5.7 dB (SD = 0.90 dB)可達百分之五十的語句聽辨率，噪音在患側時，訊噪比平均-9.3 dB (SD = 2.44 dB)，噪音在正常側時，訊噪比平均-5.7 dB (SD = 2.51 dB)，噪音複合的結果-6.6 dB (SD = 1.06 dB)。單側傳導性聽損患者雖然有一側耳朵是在正常的聽力範圍內，但是不管是在安靜環境下還是在吵雜環境下，噪音的來源不管是從好耳還是從劣耳來，其語音聽辨的能力還是比兩耳都正常的聽常者要來得差。雖然患者的聽損程度只有輕度或中度，但是對於語音聽辨的影響仍不可忽略。建議仍要積極的進行治療改善劣耳的聽閾，以提升患者在安靜以及噪音環境下的語音聽辨能力。[[abstract]]The purpose of this study was to evaluate the speech discrimination of patient with unilateral conductive hearing loss under quiet and noise environment. Taiwan Version of Mandarin Hearing in Noise Test (MHINT-T) was used to investigate the reception thresholds of sentences (RTS) in sound field.There were 42 individuals involved in this study. Twenty five individuals with normal hearing threshold were refer as control group, and the rest with unilateral conductive hearing loss were referred as test group. The study was to test the RTSs in each group under quiet and noise environment.In the control group, the average RTS in quiet was 22.5 dBA (SD = 2.54 dB). There were three different situations when testing under noise: noise front, noise right and noise left. In order to achieve 50% sentence discrimination score, noise front averaged signal to noise ratio was -6.9 dB (SD = 0.95 dB). Noise right was -15.7 dB (SD = 1.19 dB) and noise left was -12.6 dB (SD = 1.85 dB), respectively. Noise composite was -10.6 dB (SD = 0.95 dB), which represented the total performance under noise situation for individuals. In the test group, RTS in quiet was 29.9 dBA (SD = 3.54 dB). According to the thresholds from both ears of individuals, separated noise source into three direction: noise front, noise form bad side and noise from normal side. The averaged SNR of noise front was -5.7 dB (SD = 0.90 dB), -9.3 dB (SD = 2.44 dB) for the noise form bad side, and -5.7 dB (SD = 2.51 dB) for noise form normal side and noise composite was -6.6 dB (SD = 1.06 dB), respectively.There was a normal ear in patients who had unilateral conductive hearing loss, but their speech discrimination were worse than person who had normal hearing in all test situation. We should not ignored the speech discrimination under quiet and noise environment effected by mild or moderate hearing loss. Treatment would be suggested to elevate thresholds of the bad ear in order to improve speech discrimination under quiet and noise environment