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Jacek Smurzynski, PhD; Gerald Leonard, MD; D. O. Kim, DSc; Denis C. Lafreniere, MD; Marjorie D. Jung, MS

Arch Otolaryngol Head Neck Surg. 1990;116(11):1309-1316.

Abstract
• Distortion product otoacoustic emissions (DPOEs) were recorded in a group of normally hearing subjects (29 ears) and a group of subjects whose conditions were diagnosed as sensorineural hearing loss (23 ears) to study any correlation that might exist between DPOE characteristics and hearing impairment of different configurations. Three different DPOE paradigms have been used to investigate the influence of different test parameters on the DPOE data for normal and hearing-impaired ears. All normally hearing ears demonstrated detectable DPOEs, provided that the primary tone level was above a certain value. Hearing-impaired ears produced substantially reduced DPOEs compared with normally hearing subjects when the primary frequencies f₁ and f₂ corresponded to the region of hearing loss. Our data also suggested that, in general, more than one f₂/f₁ ratio is needed to examine any particular frequency region. The DPOEs provide frequency-specific information about cochlear function, which after further development, may form a basis for a noninvasive, objective method of evaluating cochlear function.

(Arch Otolaryngol Head Neck Surg. 1990;116:1309-1316)

Author Affiliations
From the Division of Otolaryngology, Surgical Research Center, Center for Neurological Sciences, University of Connecticut Health Center, Farmington.

Footnotes
Accepted for publication May 30, 1990.

Reprint requests to Division of Otolaryngology, University of Connecticut Health Center, 263 Farmington Ave, Farmington, CT 06032 (Dr Kim).

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