Relation of distortion product otoacoustic emission with tinnitus

Mazita Ami, Asma Abdullah, Mahamad A. Awang, Borhan Liyab, Lokman Saim

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

OBJECTIVE: To investigate cochlear outer hair cell function based on distortion product otoacoustic emission (DPOAE) in patients with tinnitus. STUDY DESIGN: This is a case control study. SUBJECTS AND METHODS: The subjects are patients who attended the Otorhinolaryngology Clinic in Hospital Universiti Kebangsaan Malaysia over a period of 19 months from April 2005 until October 2006. All patients underwent a full ENT assessment and had tympanometry, pure tone audiometry, and DPOAE tests. The UKM Research and Ethics Committee reviewed and approved the study proposal prior to commencement of this study. RESULTS: The study population included 49 patients. They consisted of 16 patients (32 ears) with tinnitus and reduced hearing, 13 patients (26 ears) with tinnitus and normal hearing, 7 patients (13 ears) without tinnitus with reduced hearing, and 13 patients (26 ears) without tinnitus with normal hearing. Statistical analysis showed significant differences (P = .00) of mean DPOAE levels between the four groups of patients. CONCLUSION: Our results suggest that reduced outer hair cell activity, as detected by reduced DPOAE levels, may manifest as tinnitus even before there is a shift on hearing threshold. We also postulate that further reduction of cochlear outer hair cell activity, as shown by further reduced DPOAE levels, may actually terminate the source of tinnitus.

Original languageEnglish
Pages (from-to)712-717
Number of pages6
JournalLaryngoscope
Volume118
Issue number4
DOIs
Publication statusPublished - Apr 2008

Fingerprint

Tinnitus
Outer Auditory Hair Cells
Hearing
Ear
Acoustic Impedance Tests
Pure-Tone Audiometry
Research Ethics Committees
Malaysia
Otolaryngology
Case-Control Studies

Keywords

  • Distortion product otoacoustic emission
  • Outer hair cell
  • Tinnitus

ASJC Scopus subject areas

  • Otorhinolaryngology

Cite this

Relation of distortion product otoacoustic emission with tinnitus. / Ami, Mazita; Abdullah, Asma; Awang, Mahamad A.; Liyab, Borhan; Saim, Lokman.

In: Laryngoscope, Vol. 118, No. 4, 04.2008, p. 712-717.

Research output: Contribution to journalArticle

Ami, Mazita ; Abdullah, Asma ; Awang, Mahamad A. ; Liyab, Borhan ; Saim, Lokman. / Relation of distortion product otoacoustic emission with tinnitus. In: Laryngoscope. 2008 ; Vol. 118, No. 4. pp. 712-717.
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