Long-term Effects of Tinnitus Retraining Therapy Involving Monaural Noise Generators

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  • Inagaki Yozo
    Department of Otolaryngology-Head and Neck Surgery, Keio University School of Medicine
  • Oishi Naoki
    Department of Otolaryngology-Head and Neck Surgery, Keio University School of Medicine
  • Kanzaki Sho
    Department of Otolaryngology-Head and Neck Surgery, Keio University School of Medicine
  • Wakabayashi Satoko
    Department of Otolaryngology-Head and Neck Surgery, Keio University School of Medicine
  • Fujioka Masato
    Department of Otolaryngology-Head and Neck Surgery, Keio University School of Medicine
  • Watabe Takahisa
    Department of Otolaryngology-Head and Neck Surgery, Keio University School of Medicine
  • Watanabe Reiko
    Department of Otolaryngology-Head and Neck Surgery, Keio University School of Medicine
  • Wasano Koichiro
    Department of Otolaryngology-Head and Neck Surgery, Keio University School of Medicine
  • Yamada Hiroyuki
    Department of Otolaryngology-Head and Neck Surgery, Keio University School of Medicine
  • Kojima Takashi
    Department of Otolaryngology-Head and Neck Surgery, Keio University School of Medicine
  • Shinden Seiichi
    Department of Otolaryngology, Saiseikai Utsunomiya Hospital
  • Ogawa Kaoru
    Department of Otolaryngology-Head and Neck Surgery, Keio University School of Medicine

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Other Title
  • 一側性音響刺激を用いたTRT単独療法の2年以上の長期効果
  • イチソクセイ オンキョウ シゲキ オ モチイタ TRT タンドク リョウホウ ノ 2ネン イジョウ ノ チョウキ コウカ

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Abstract

We have previously reported on the effects of tinnitus retraining therapy (TRT) involving monaural noise generators (NGs) up to 24 months after the start of treatment (Eur Arch Otorhinolaryngol. 2013 Feb; 270 (2): 443-8.) but very few reports exist about the long-term effects of TRT for periods of over 2 years. The aim of this study was to report the effects of TRT involving monaural NGs more than 24 months after the start of treatment. Thirty-three patients with chronic tinnitus were included in this study. All received directive counseling and monaural NGs without any other combination treatment. Effects were evaluated with the Tinnitus Handicap Inventory (THI) at their final visits to our clinic (average 31 months after the start of treatment). The average THI scores significantly improved from 55.3±19.7 at baseline to 33.5±23.3 at their final visits. Seventeen patients (52%) improved by more than 20 points from the baseline. Eleven patients who were treated with TRT for more than 3 years were individually observed in a detailed manner. Some of them experienced aggravation of their symptoms after 2 years' successful treatments. This study suggests that, although TRT seems effective more than 2 years after the start of treatment, the clinical course of each patient can vary and we need to follow them periodically depending on their situations and symptoms.

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