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Brooks CA, Clavier OH, Fellows AM, Rieke CC, Niemczak CE, Gui J, Pryor NJ, Gallagher HL, Murphy SA, Wise SR, Healy-Leavitt C, Allen LV, Buckey JC. Distortion product otoacoustic mapping measured pre- and post-loud sound exposures. Int J Audiol 2021; 61:187-196. [PMID: 34107827 DOI: 10.1080/14992027.2021.1928303] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
OBJECTIVE Sampling distortion product otoacoustic emissions (DPOAEs) at multiple f2/f1 ratios and f2 frequency values produces a DPOAE "map." This study examined the efficacy of DPOAE mapping compared with pure tone audiometry and standard DPOAEs for detecting noise effects in subjects exposed to loud sound. DESIGN A map significance score was developed as a single measure of map change. Significance scores were evaluated before and after exposure to: loud music (LM), controlled noise (CN), and firing range noise (FR) in three separate sets of subjects. Scores were compared to audiometry and standard DPOAE results in the LM study. STUDY SAMPLE The LM and CN exposure studies involved 22, and 20 healthy young subjects respectively with normal hearing. Eight Marines were studied before and after FR exposure. RESULTS After LM exposure, audiometry showed significant changes at 1, 2, 4, and 6 kHz. Standard DPOAE measures were also significantly different at several frequencies. Map significance scores detected changes more effectively and showed the distribution of DPOAE alterations. CONCLUSIONS Map significance scores detected changes after noise exposure more reliably than audiometry and standard DPOAEs. Additionally, maps showed a diffuse response to sound exposure perhaps explaining why individual DP-grams appear less sensitive.
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Affiliation(s)
| | | | | | | | | | - Jiang Gui
- Geisel School of Medicine at Dartmouth, Hanover, NH, USA
| | - Nina J Pryor
- Air Force Research Laboratory, Wright Patterson Air Force Base, Dayton, OH, USA.,Department of Defense, Hearing Center of Excellence, San Antonio, TX, USA.,zCore Business Solutions, Inc, Round Rock, TX, USA
| | - Hilary L Gallagher
- Air Force Research Laboratory, Wright Patterson Air Force Base, Dayton, OH, USA
| | - Sara A Murphy
- Department of Defense, Hearing Center of Excellence, San Antonio, TX, USA.,Naval Medical Center San Diego, San Diego, CA, USA.,The Geneva Foundation, Tacoma, WA, USA
| | - Sean R Wise
- Creare LLC, Hanover, NH, USA.,Dartmouth-Hitchcock Medical Center, Lebanon, NH, USA
| | | | | | - Jay C Buckey
- Geisel School of Medicine at Dartmouth, Hanover, NH, USA
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