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Post-processing analysis of transient-evoked otoacoustic emissions to detect 4 kHz-notch hearing impairment--a pilot study.

Zimatore G, Fetoni AR, Paludetti G, Cavagnaro M, Podda MV, Troiani D - Med. Sci. Monit. (2011)

Bottom Line: Audiometric examinations indicated 14 ears as impaired-hearing (IH), while the TEOAE ILO92 whole reproducibility parameter (WWR) indicated as IH 7 signals out of 14 (50%).The proposed new parameter indicated as IH 9 signals out of 14 (64%), reducing the number of false negative cases of WWR.In this preliminary study there is evidence that the new parameter RAD2D defines the topology and the quantification of the damage in the inner ear.

View Article: PubMed Central - PubMed

Affiliation: Institute of Otolaryngology, Catholic University School of Medicine, Rome, Italy.

ABSTRACT

Background: To identify a parameter to distinguish normal hearing from hearing impairment in the early stages. The parameter was obtained from transient-evoked otoacoustic emissions (TEOAEs), overcoming the limitations of the usually adopted waveform descriptive parameters which may fail in standard clinical screenings.

Material/methods: Audiometric examinations and TEOAE analysis were conducted on 15 normal ears and on 14 hearing-impaired ears that exhibited an audiometric notch around 4 kHz. TEOAE signals were analyzed through a multivariate technique to filter out the individual variability and to highlight the dynamic structure of the signals. The new parameter (named radius 2-dimension--RAD2D) was defined and evaluated for simulated TEOAE signals modeling a different amount of hearing impairment.

Results: Audiometric examinations indicated 14 ears as impaired-hearing (IH), while the TEOAE ILO92 whole reproducibility parameter (WWR) indicated as IH 7 signals out of 14 (50%). The proposed new parameter indicated as IH 9 signals out of 14 (64%), reducing the number of false negative cases of WWR.

Conclusions: In this preliminary study there is evidence that the new parameter RAD2D defines the topology and the quantification of the damage in the inner ear. The proposed protocol can be useful in hearing screenings to identify hearing impairments much earlier than conventional pure tone audiometry and TEOAE pass/fail test.

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Related in: MedlinePlus

Recurrence plots(*) (A, B) obtained from the RQA analysis of the TEOAE waveforms depicted in the bottom panels (C, D). Panels A and C refer to a normal ear, while panels B and D refer to an IH ear. A decreasing determinism in the IH TEOAE waveform can be observed. (*) Visual Recurrence Analysis, version 4.9. Copyright© 1996–2006 Eugene Kononov.
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f2-medscimonit-17-6-mt41: Recurrence plots(*) (A, B) obtained from the RQA analysis of the TEOAE waveforms depicted in the bottom panels (C, D). Panels A and C refer to a normal ear, while panels B and D refer to an IH ear. A decreasing determinism in the IH TEOAE waveform can be observed. (*) Visual Recurrence Analysis, version 4.9. Copyright© 1996–2006 Eugene Kononov.

Mentions: Figure 2 shows the recurrence plots (Figure 2A, B) of measured TEOAE signals (Figure 2C, D) from a normal hearing subject (left side of Figure 2) and from an IH subject (right side of Figure 2). Comparing Figure 2A and B, it is clear that recurrence plots distinguish between normal hearing and IH TEOAEs, especially in terms of a reduction in the deterministic structure.


Post-processing analysis of transient-evoked otoacoustic emissions to detect 4 kHz-notch hearing impairment--a pilot study.

Zimatore G, Fetoni AR, Paludetti G, Cavagnaro M, Podda MV, Troiani D - Med. Sci. Monit. (2011)

Recurrence plots(*) (A, B) obtained from the RQA analysis of the TEOAE waveforms depicted in the bottom panels (C, D). Panels A and C refer to a normal ear, while panels B and D refer to an IH ear. A decreasing determinism in the IH TEOAE waveform can be observed. (*) Visual Recurrence Analysis, version 4.9. Copyright© 1996–2006 Eugene Kononov.
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC3539534&req=5

f2-medscimonit-17-6-mt41: Recurrence plots(*) (A, B) obtained from the RQA analysis of the TEOAE waveforms depicted in the bottom panels (C, D). Panels A and C refer to a normal ear, while panels B and D refer to an IH ear. A decreasing determinism in the IH TEOAE waveform can be observed. (*) Visual Recurrence Analysis, version 4.9. Copyright© 1996–2006 Eugene Kononov.
Mentions: Figure 2 shows the recurrence plots (Figure 2A, B) of measured TEOAE signals (Figure 2C, D) from a normal hearing subject (left side of Figure 2) and from an IH subject (right side of Figure 2). Comparing Figure 2A and B, it is clear that recurrence plots distinguish between normal hearing and IH TEOAEs, especially in terms of a reduction in the deterministic structure.

Bottom Line: Audiometric examinations indicated 14 ears as impaired-hearing (IH), while the TEOAE ILO92 whole reproducibility parameter (WWR) indicated as IH 7 signals out of 14 (50%).The proposed new parameter indicated as IH 9 signals out of 14 (64%), reducing the number of false negative cases of WWR.In this preliminary study there is evidence that the new parameter RAD2D defines the topology and the quantification of the damage in the inner ear.

View Article: PubMed Central - PubMed

Affiliation: Institute of Otolaryngology, Catholic University School of Medicine, Rome, Italy.

ABSTRACT

Background: To identify a parameter to distinguish normal hearing from hearing impairment in the early stages. The parameter was obtained from transient-evoked otoacoustic emissions (TEOAEs), overcoming the limitations of the usually adopted waveform descriptive parameters which may fail in standard clinical screenings.

Material/methods: Audiometric examinations and TEOAE analysis were conducted on 15 normal ears and on 14 hearing-impaired ears that exhibited an audiometric notch around 4 kHz. TEOAE signals were analyzed through a multivariate technique to filter out the individual variability and to highlight the dynamic structure of the signals. The new parameter (named radius 2-dimension--RAD2D) was defined and evaluated for simulated TEOAE signals modeling a different amount of hearing impairment.

Results: Audiometric examinations indicated 14 ears as impaired-hearing (IH), while the TEOAE ILO92 whole reproducibility parameter (WWR) indicated as IH 7 signals out of 14 (50%). The proposed new parameter indicated as IH 9 signals out of 14 (64%), reducing the number of false negative cases of WWR.

Conclusions: In this preliminary study there is evidence that the new parameter RAD2D defines the topology and the quantification of the damage in the inner ear. The proposed protocol can be useful in hearing screenings to identify hearing impairments much earlier than conventional pure tone audiometry and TEOAE pass/fail test.

Show MeSH
Related in: MedlinePlus