von Buchwald C, Pedersen F, Parving A
Department of Audiology, Bispebjerg Hospital, Copenhagen, Denmark.
Scand Audiol. 1991;20(2):117-20. doi: 10.3109/01050399109070800.
The purpose of the present investigation was to evaluate the magnitude of selective high-frequency amplification obtained by an in-the-canal hearing aid (ITC-HA), and to compare it with that obtained with a conventional behind-the-ear hearing aid (BTE-HA) with an open mould. 22 subjects (20 males, 2 females) at a median age of 66 years (range 46-84) were included in the investigation. All suffered from a bilateral high-frequency hearing loss with normal or near-normal hearing thresholds at 0.5 and 1 kHz. Insertion gain measurements demonstrated that the ITC-HA gives a significantly higher amplification in the high-frequency area, when compared with the BTE-HA, though neither of the hearing aids amplified as much as indicated by the POGO strategy. Although a better amplification in the high-frequency area was obtained with the ITC-HA, it did not result in significantly better speech recognition when compared with the BTE-HA. At the hearing aid fitting, all subjects preferred the ITC-HA, and after an observation period of one year, 68% of those fitted used the aid continuously. Based on the investigation it is concluded that hearing-impaired persons can be fitted with an ITC-HA, even if they have pronounced high-frequency hearing loss, and that this type of aid is preferred by the hearing-impaired to the conventional BTE-HA.
本研究的目的是评估耳道式助听器（ITC-HA）所获得的选择性高频放大程度，并将其与传统的开放式耳背式助听器（BTE-HA）所获得的放大程度进行比较。22名受试者（20名男性，2名女性）被纳入研究，年龄中位数为66岁（范围46 - 84岁）。所有受试者均患有双侧高频听力损失，在0.5和1kHz频率处听力阈值正常或接近正常。插入增益测量表明，与BTE-HA相比，ITC-HA在高频区域能提供显著更高的放大倍数，不过两种助听器的放大倍数均未达到POGO策略所指示的程度。尽管ITC-HA在高频区域获得了更好的放大效果，但与BTE-HA相比，其语音识别能力并未显著提高。在助听器验配时，所有受试者都更喜欢ITC-HA，经过一年的观察期后，68%的验配者持续使用该助听器。基于该研究得出结论，即使听力受损者有明显的高频听力损失，也可以佩戴ITC-HA，而且这种类型的助听器比传统的BTE-HA更受听力受损者青睐。
