scholarly journals Automated pure-tone threshold estimations from extrapolated distortion product otoacoustic emission (DPOAE) input∕output functions

2006 ◽  
Vol 119 (4) ◽  
pp. 1937-1939 ◽  
Author(s):  
Nicolas Schmuziger ◽  
Jochen Patscheke ◽  
Rudolf Probst
Keyword(s):  
Pure Tone ◽  
Otoacoustic Emission ◽  
Distortion Product Otoacoustic Emission ◽  
Input Output ◽  
Distortion Product ◽  
Pure Tone Threshold

Comparison of distortion product otoacoustic emissions and pure tone audiometry in occupational screening for auditory deficit due to noise exposure

2015 ◽  
Vol 129 (12) ◽  
pp. 1174-1181 ◽  
Author(s):  
N Wooles ◽  
M Mulheran ◽  
P Bray ◽  
M Brewster ◽  
A R Banerjee
Keyword(s):  
Otoacoustic Emissions ◽  
Pure Tone ◽  
Noise Exposure ◽  
Outer Hair Cell ◽  
Cell Function ◽  
Pure Tone Audiometry ◽  
Otoacoustic Emission ◽  
Distortion Product Otoacoustic Emissions ◽  
Distortion Product Otoacoustic Emission ◽  
Distortion Product

AbstractObjective:To examine whether distortion product otoacoustic emissions can serve as a replacement for pure tone audiometry in longitudinal screening for occupational noise exposure related auditory deficit.Methods:A retrospective review was conducted of pure tone audiometry and distortion product otoacoustic emission data obtained sequentially during mandatory screening of brickyard workers (n = 16). Individual pure tone audiometry thresholds were compared with distortion product otoacoustic emission amplitudes, and a correlation of these measurements was conducted.Results:Pure tone audiometry threshold elevation was identified in 13 out of 16 workers. When distortion product otoacoustic emission amplitudes were compared with pure tone audiometry thresholds at matched frequencies, no evidence of a robust relationship was apparent. Seven out of 16 workers had substantial distortion product otoacoustic emissions with elevated pure tone audiometry thresholds.Conclusion:No clinically relevant predictive relationship between distortion product otoacoustic emission amplitude and pure tone audiometry threshold was apparent. These results do not support the replacement of pure tone audiometry with distortion product otoacoustic emissions in screening. Distortion product otoacoustic emissions at frequencies associated with elevated pure tone audiometry thresholds are evidence of intact outer hair cell function, suggesting that sites distinct from these contribute to auditory deficit following ototrauma.

scholarly journals Pemeriksaan Otoacoustic Emission (OAE) untuk menilai keberhasilan terapi metilprednisolon

2019 ◽  
Vol 49 (1) ◽  
pp. 1
Author(s):  
Brastho Bramantyo ◽  
Jenny Bashiruddin ◽  
Widayat Alviandi ◽  
Risdawati Risdawati
Keyword(s):  
Systematic Review ◽  
Pure Tone ◽  
Signal To Noise Ratio ◽  
Hearing Threshold ◽  
Otoacoustic Emission ◽  
Sudden Deafness ◽  
Distortion Product Otoacoustic Emission ◽  
Signal To Noise ◽  
Cochrane Systematic Review ◽  
Distortion Product

Latar belakang: Penatalaksanaan tuli mendadak menggunakan steroid sebagai terapi utama merupakan hasil konsensus terapi tuli mendadak tahun 2010 di Madrid-Spanyol dan Cochrane systematic review tahun 2009, yang saat ini diterapkan di Divisi Neurotologi Departemen Telinga Hidung Tenggorok-Kepala Leher Rumah Sakit Cipto Mangunkusumo. Evaluasi hasil pengobatan dilakukan dengan pemeriksaan audiometri dan Distortion Product Otoacoustic Emission (DPOAE). Pasien yang mengalami kesembuhan akan memperlihatkan peningkatan ambang dengar dan nilai Signal to Noise Ratio (SNR) emisi otoakustik. Tujuan: Mengevaluasi hasil terapi metilprednisolon dosis terbaru pada tuli mendadak dengan pemeriksaan DPOAE dan audiometri nada murni. Metode: Penelitian ini menggunakan desain pre dan post eksperimental. Diberikan terapi metilprednisolon 1 mg/kgBB dengan tapering off 20 mg setiap 5 hari. Dilakukan pemeriksaan DPOAE dan audiometri sebelum dan setelah terapi. Hasil: Total sampel yang diolah adalah 22 subjek. Penelitian ini mendapatkan perubahan yang bermakna nilai audiometri nada murni sebelum dan sesudah terapi pada semua frekuensi. Nilai SNR pada OAE sebelum dan setelah terapi rata-rata mengalami perubahan nilai pass, dengan perubahan nilai SNR pass terbanyak adalah pada frekuensi 8000 Hz (6 subjek). Tingkat perubahan ambang dengar sesudah terapi yang mengalami perbaikan paling banyak pada frekuensi 2000 Hz, 3000 Hz, 6000 Hz dengan masing-masing 16 subjek. Perbaikan emisi terjadi lebih awal dibandingkan perbaikan ambang dengar. Kesimpulan: Pada penelitian ini terdapat perubahan bermakna nilai audiometri, dan nilai DPOAE. Didapatkan hubungan bermakna perubahan SNR pada OAE dengan tingkat perubahan ambang dengar frekuensi 8000 Hz dan 10.000 Hz, setelah pengobatan metilprednisolon sesuai protokol penelitian ini. Background: Methylprednisolone as a drug of choice in sudden deafness was consented in Madrid, Spain 2010 and in Cochrane systematic review in 2009, and already applied in Neurotology Division, ENT Department Cipto Mangunkusumo Hospital. Sudden deafness treatment evaluation conducted by audiometry and Distortion Product Otoacoustic Emission (DPOAE) examinations. Hearing recovery could be assessed from the improvement of hearing threshold and Signal to Noise Ratio (SNR) of otoacoustic emission (OAE). Objective: To evaluate the current dose of methylprednisolone therapy for sudden deafness, by DPOAE and pure tone audiometry. Methods: This was a pre-post experimental study using methylprednisolone 1 mg/kg body weight tapered off 20 mg in every 5 days. DPOAE and audiometry examination were conducted pre and post therapy. Result: Total sample were 22 subjects. Significant improvement was seen in overall frequencies of audiometry examination. Pass result in SNR of OAE showed remarkable improvement in 8000 Hz (6 subjects). The level of pure tone threshold mainly increased in frequencies of 2000 Hz, 3000 Hz, and 6000 Hz, each 16 subjects. Improvement of the emision level occurred earlier than the hearing threshold. Conclusion: This study revealed significant improvement of audiometry threshold and OAE level. Significant correlation was found between SNR of OAE improvement with increased pure tone level in 8000 Hz and 10.000 Hz after methylprednisolone therapy according to the protocol of this study.

scholarly journals Correlation between schroeder-phase effect and distortion product otoacoustic emission findings

2016 ◽  
Vol 15 (1) ◽  
Author(s):  
Nur Baizura Salahuddin ◽  
Sarah Rahmat
Keyword(s):  
Pure Tone Audiometry ◽  
Otoacoustic Emission ◽  
Outer Hair Cells ◽  
Output Function ◽  
Distortion Product Otoacoustic Emission ◽  
Input Output ◽  
Phase Effect ◽  
Cochlear Function ◽  
Distortion Product ◽  
Effect Mechanism

Introduction: Schroeder-phase masking has been proven to be more sensitive than pure tone audiometry in detecting changes in cochlear function. Schroeder harmonic complexes with different phases have been observed to excite basilar membranes differently and give different masking abilities (‘phase effect’) when used as maskers. Previous theory suggested that phase effect was contributed by cochlear non-linearity of outer hair cells (OHC); however the theory was derived from behavioral observation alone. Therefore, this study aims to further investigate the cochlear non-linearity involvement in phase effect mechanism by measuring the Schroeder phase effect together with another electrophysiological test that measures the cochlear non-linearity function, i.e. Distortion Product Otoacoustic Emission (DPOAE). Methods: Twelve normal hearing and four sensorineural hearing loss subjects were recruited. Schroeder phase masking test was conducted and phase effect (using 75 dB A masker) at 1kHz and 2 kHz was measured. DPOAE was recorded at multiple intensities (45-75 dB SPL) for 1 kHz and 2 kHz, and slope of DPOAE input output function was measured. Correlation analysis was performed to find correlation between phase effect and slope of DPOAE input output function. Results: Result showed no significant correlation (p > 0.05) between phase effect and slope of DPOAE input output function. Conclusions: This findings suggest that Schroeder-phase effect may not be/ may not only be contributed by OHC’s cochlear non-linearity. This finding opens the possibility of other auditory functions’ involvement in phase effect mechanism, and contribute to better understanding towards auditory perceptions.

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