The Accuracy of Matching Target Insertion Gains With Open-Fit Hearing Aids Purpose To assess the accuracy with which target insertion gains were matched for a single type of open-fit hearing aid, both on initial fitting and after adjustment. Method The hearing aids were fitted using the first-fit setting in the programming software and the target formula was selected as ... Research Article
Research Article  |   December 01, 2012
The Accuracy of Matching Target Insertion Gains With Open-Fit Hearing Aids
 
Author Affiliations & Notes
  • Hashir Aazh
    Royal Surrey County Hospital National Health Service Foundation Trust, United Kingdom
    London School of Hygiene & Tropical Medicine, University of London, United Kingdom
  • Brian C. J. Moore
    University of Cambridge, United Kingdom
  • Deepak Prasher
    Royal Surrey County Hospital National Health Service Foundation Trust, United Kingdom
  • Correspondence to Hashir Aazh: hashir.aazh@nhs.net
  • Editor: Sheila Pratt
    Editor: Sheila Pratt×
  • Associate Editor: Jeffrey DiGiovanni
    Associate Editor: Jeffrey DiGiovanni×
Article Information
Hearing Aids, Cochlear Implants & Assistive Technology / Research Articles
Research Article   |   December 01, 2012
The Accuracy of Matching Target Insertion Gains With Open-Fit Hearing Aids
American Journal of Audiology, December 2012, Vol. 21, 175-180. doi:10.1044/1059-0889(2012/11-0008)
History: Received February 5, 2011 , Revised July 7, 2011 , Accepted May 15, 2012
 
American Journal of Audiology, December 2012, Vol. 21, 175-180. doi:10.1044/1059-0889(2012/11-0008)
History: Received February 5, 2011; Revised July 7, 2011; Accepted May 15, 2012
Web of Science® Times Cited: 7

Purpose To assess the accuracy with which target insertion gains were matched for a single type of open-fit hearing aid, both on initial fitting and after adjustment.

Method The hearing aids were fitted using the first-fit setting in the programming software and the target formula was selected as NAL–NL1. The difference between the real ear insertion gain (REIG) and the NAL–NL1 target REIG was recorded. The initial fitting was considered acceptable if the difference was less than 10 dB at all frequencies. If an initial fitting was not acceptable, the frequency-gain response was modified. The difference between the final REIG and the NAL–NL1 target REIG was recorded as final target mismatch.

Results Of the 51 initial fittings, 36 (71%) failed to achieve a match within ±10 dB of the NAL–NL1 insertion gain target at 1 or more frequencies between 0.25 and 4 kHz. After the authors adjusted the frequency-gain response of the hearing aids, only 9 fittings (18%) failed to achieve a match.

Conclusion These outcomes suggest that target insertion gains for the open-fit hearing aids used here are rarely achieved with a first fitting but can usually be achieved through adjustments based on REIG measurements.

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