Incidence of Responses at the Lower Audiometric Limits Purpose To put forward a symbol extension, consisting of an upward arrow added to current symbols, to denote that a patient continued to respond at the audiometric limit (i.e., –10 dB HL). Also, to present survey data to characterize the incidence of these responses. Method A retrospective survey ... Clinical Focus: Innovation
Clinical Focus: Innovation  |   December 01, 2007
Incidence of Responses at the Lower Audiometric Limits
 
Author Affiliations & Notes
  • Chris Halpin
    Massachusetts Eye and Ear Infirmary, Harvard Medical School, Boston
  • Contact author: Chris Halpin, Department of Audiology, Massachusetts Eye and Ear Infirmary, 243 Charles Street, Boston, MA 02114. E-mail: cfhalpin@meei.harvard.edu.
Article Information
Hearing Disorders / Clinical Focus / Innovation
Clinical Focus: Innovation   |   December 01, 2007
Incidence of Responses at the Lower Audiometric Limits
American Journal of Audiology, December 2007, Vol. 16, 96-99. doi:10.1044/1059-0889(2007/013)
History: Received April 8, 2007 , Accepted July 25, 2007
 
American Journal of Audiology, December 2007, Vol. 16, 96-99. doi:10.1044/1059-0889(2007/013)
History: Received April 8, 2007; Accepted July 25, 2007

Purpose To put forward a symbol extension, consisting of an upward arrow added to current symbols, to denote that a patient continued to respond at the audiometric limit (i.e., –10 dB HL). Also, to present survey data to characterize the incidence of these responses.

Method A retrospective survey of 2,821 sequential audiometric evaluations was performed. Responses at the audiometric limits were counted, along with the stimulus conditions (i.e., transducer, frequency, and masking) and the age of the patient.

Results A total of 307 instances of responses at the lower audiometric limits were seen in 173 of these cases (6.13%), with the majority by bone conduction.

Conclusions The overall rate of responses at the audiometric limits was low, as expected. However, these responses were primarily seen in the age group from 4 to 15 years, and at least one such response occurred in 26% of cases in that age range.

Acknowledgments
The author would like to thank Peter Marciniak, MSc, who implemented the symbols described, and Lynne Davis, PhD, for valuable input. Thanks also to the audiologists of the Department of Audiology, Massachusetts Eye and Ear Infirmary, without whom this work could not have been accomplished.
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