Journal of Audiology & Otology

The Korean Audiology Society (대한청각학회)
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Auditory Recognition of Digit-in-Noise under Unaided and Aided Conditions in Moderate and Severe Sensorineural Hearing Loss

  • Aghasoleimani, Mina (Department of Audiology, School of Rehabilitation, Shahid Beheshti University of Medical Sciences) ;
  • Jalilvand, Hamid (Department of Audiology, School of Rehabilitation, Shahid Beheshti University of Medical Sciences) ;
  • Mahdavi, Mohammad Ebrahim (Department of Audiology, School of Rehabilitation, Shahid Beheshti University of Medical Sciences) ;
  • Ahmadi, Roghayeh (Department of Audiology, School of Rehabilitation, Shahid Beheshti University of Medical Sciences)
  • Received : 2020.02.22
  • Accepted : 2020.08.25
  • Published : 2021.04.20
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Abstract

Background and Objectives: The speech-in-noise test is typically performed using an audiometer. The results of the digit-in-noise recognition (DIN) test may be influenced by the flat frequency response of free-field audiometry and frequency of the hearing aid fit based on fitting rationale. This study aims to investigate the DIN test in unaided and aided conditions. Subjects and Methods: Thirty four adults with moderate and severe sensorineural hearing loss (SNHL) participated in the study. The signal-to-noise ratio (SNR) for 50% of the DIN test was obtained in the following two conditions: 1) the unaided condition, performed using an audiometer in a free field; and 2) aided condition, performed using a hearing aid with an unvented individual earmold that was fitted based on NAL-NL2. Results: There was a statistically significant elevation in the mean SNR for the severe SNHL group in both test conditions when compared with that of the moderate SNHL group. In both groups, the SNR for the aided condition was significantly lower than that of the unaided condition. Conclusions: Speech recognition in hearing-impaired patients can be realized by fitting hearing aids based on evidence-based fitting rationale rather than by measuring it using free-field audiometry measurement that is utilized in a routine clinic setup.

Keywords

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