Cochlear outer hair cell electromotility can provide force for both low and high intensity distortion product otoacoustic emissions

1998 ◽  
Vol 126 (1-2) ◽  
pp. 67-74 ◽  
Author(s):  
Gregory I Frolenkov ◽  
Inna A Belyantseva ◽  
Mauricio Kurc ◽  
Mary Ann Mastroianni ◽  
Bechara Kachar
Keyword(s):  
Hair Cell ◽  
High Intensity ◽  
Otoacoustic Emissions ◽  
Outer Hair Cell ◽  
Distortion Product Otoacoustic Emissions ◽  
Distortion Product

scholarly journals Hubungan asfiksia perinatal dengan gangguan fungsi sel rambut luar koklea

2019 ◽  
Vol 49 (20) ◽  
Author(s):  
Novi Primadewi ◽  
Dewi Pratiwi ◽  
Diah Hayustiningsih
Keyword(s):  
Hair Cell ◽  
General Hospital ◽  
Otoacoustic Emissions ◽  
Outer Hair Cell ◽  
Distortion Product Otoacoustic Emissions ◽  
Control Group ◽  
Case Group ◽  
Chi Square ◽  
Distortion Product ◽  
Impaired Function

Latar belakang: Bayi baru lahir dengan asfiksia perinatal dapat mengalami gangguan fungsi sel rambut luar  pada kokleanya. Tujuan:  Mengetahui   hubungan   asfiksia  perinatal  dengan  gangguan   fungsi  sel rambut luar koklea. Metode: Penelitian analitik observasional dengan desain Case control yang dilakukan di bagian perinatologi RSUD Dr. Moewardi Surakarta, RSUD Karanganyar,          RSUD Wonogiri, dan RSUD Sukoharjo dengan waktu penelitian  pada bulan Oktober 2014 – Januari 2015. Sampel penelitian dipilih dengan cara non probability sampling yaitu dengan teknik consecutive sampling, sebanyak 50 orang yang terdiri dari 25 kelompok kasus dan 25 kelompok kontrol. Diagnosis adanya gangguan fungsi sel rambut luar koklea  ditegakkan dari hasil pemeriksaan fisik THT dan pemeriksaan Distortion Product Otoacoustic Emissions  (DPOAE). Asfiksia perinatal dapat dilihat dengan menggunakan  skor APGAR, sedangkan faktor risiko yang lain dapat dilihat dari  catatan  medis pasien. Analisis statistik menggunakan univariat, bivariat, dengan chi square dan multivariat dengan regresi logistik ganda model faktor risiko. Hasil: Dari 25 kelompok kasus dan 25 kelompok kontrol didapatkan hasil bahwa asfiksia perinatal merupakan faktor risiko yang berpengaruh terjadinya gangguan fungsi sel rambut luar koklea.  Bayi baru lahir yang mempunyai  gangguan fungsi sel rambut luar koklea  dengan  asfiksia perinatal mempunyai faktor risiko 29 kali lebih besar daripada bayi dengan bayi baru lahir tanpa gangguan fungsi sel rambut luar koklea, setelah mengontrol pengaruh dari faktor perancu hiperbilirubinemia dan berat  badan lahir rendah. Hasil tersebut didapatkan bermakana secara statitistik (OR=29,614; CI – 95 % = 5,454 - 160,792; p<0,001). Kesimpulan: Terdapat hubungan antara asfiksia perinatal dengan  gangguan fungsi sel rambut luar koklea. Background: Newborn  with  perinatal  asphyxiae can occur disturbance of  function outer hair cell in the cochlea. Objective: was to know the relationship between the degree of perinatal asphyxiae  with impaired  function  of  outer hair cell. Methods: The study was  an analytic observational study with case control design, that  took a place in perinatology department in Doctor Moewardi hospital Surakarta, General hospital  in  Karanganyar,  General hospital in Wonogiri, General hospital in Sukoharjo. The study started from October 2014 until January 2015. The sample study were selected with consecutive sampling method, with total sample of 50 newborns which consist of 25 case group and 25 control group. Impaired function of outer hair cell  has been diagnosed from ENT examination and  examined with Distortion Product Otoacoustic Emissions  (DPOAE). Perinatal asphyxiae were measured with APGAR score and the other risk factor were collected from the medical record of the patients. Data were analyzed with univariat, bivariat (chi square) and multivariat statistic with double logistic regression. Result: From 25 case group and 25 control group, were found that perinatal asphyxiae was the influence risk factor to the occurrence of impaired function of outer hair cell. Newborns have impaired function  of  outer hair cell with   perinatal asphyxiae will have the risk of twenty nine times higher than newborns without perinatal asphyxiae, after controlling of confounding factors low birth weight, and hyperbilirubinemiae. The results  was statistically significant. (OR = 29,614; CI – 95 % = 5,454 - 160,792; p < 0,001). Conclusion: There has corellated between perinatal asphyxiae and impaired function of outer hair cell.

Early Evidence of Cochlear Damage in a Large Sample of Percussionists

2005 ◽  
Vol 20 (3) ◽  
pp. 135-139
Author(s):  
Jodee A Pride ◽  
David R Cunningham
Keyword(s):  
Hearing Loss ◽  
Hair Cell ◽  
Otoacoustic Emissions ◽  
Outer Hair Cell ◽  
Cell Damage ◽  
Normal Hearing ◽  
Outer Hair Cells ◽  
Sensory Loss ◽  
Distortion Product ◽  
Hair Cell Damage

Percussionists can be exposed to intermittent sound stimuli that exceed 145 dB SPL, although damage may occur to the outer hair cells at levels of 120 dB SPL. The present study measured distortion-product otoacoustic emissions (DPOAEs) in a group of 86 normal-hearing percussionists and 39 normal-hearing nonpercussionists. Results indicate that normal-hearing percussionists have lower DPOAE amplitudes than normal-hearing nonpercussionists. DPOAE amplitudes were significantly lower at 6000 Hz in both the left and right ears for percussionists. Percussionists also more frequently had absent DPOAEs, with the greatest differences occurring at 6000 Hz (absent DPOAEs in 25% of percussionists vs 10% of nonpercussionists). When all frequencies are considered as a group, 33% of the percussionists had an absent DPOAE in either ear at some frequency, compared to only 23% of the nonpercussionists. Otoacoustic emissions are more sensitive to outer hair cell damage than pure-tone threshold measurements and can serve as an important measurement of sensory loss (i.e., outer hair cell damage) in musicians before the person perceives the hearing loss. DPOAE monitoring for musicians, along with appropriate education and intervention, might help prevent or minimize music-induced hearing loss.

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 Evaluation of outer hair cells function of non-operated ear after mastoid drilling using distortion-product otoacoustic emissions

2019 ◽  
Vol 5 (3) ◽  
pp. 130-133
Author(s):  
Virender Singh ◽  
◽  
BS Rakesh ◽  
MB Bharathi ◽  
Kota Harish Nag ◽  
...  
Keyword(s):  
Otoacoustic Emissions ◽  
Outer Hair Cell ◽  
Cell Function ◽  
Outer Hair Cells ◽  
Distortion Product Otoacoustic Emissions ◽  
Mechanical Trauma ◽  
Suppurative Otitis Media ◽  
Distortion Product ◽  
Study Materials ◽  
And Gender

Aim: To analyze the effect of acoustic and mechanical trauma of drilling on the outer hair cell function of the non operated ear using distortion-product otoacoustic emissions (DPOAE’s) after mastoidectomy and its relation with the duration of drilling, age, and gender of the patient along with duration and permanency of the effects. Study Design: Observational study. Materials and Methods: Screening DPOAE’s were recorded preoperatively, immediate postoperative period, one hour postoperatively, 1st and 7th postoperative days in the normal ear in 94 patients who underwent tympanomastoidectomy for unilateral chronic suppurative otitis media (CSOM). DPOAE’s were measured using Neuro-audio-screener (Neurosoft Inc.) at 1.5 KHz, 2.1 KHz, 3.3 KHz, and 4.2 KHz. If DPOAE’s were absent preoperatively, the patients were not evaluated further and patients who had absent DPOAE’s post-operatively were successively followed till DPOAE’s were regained. Results: Of the 94 patients included, in 62 patients DPOAE’s were present preoperatively. Out of these 62, in 30 patients DPOAE’s were absent immediate postoperatively. On repeat testing, DPOAE’s were absent in 20 patients after 1 hour and in 8 patients after 1 day. On re-evaluation of these 8 patients after 1 week all of them had regained the DPOAE’s. In terms of duration of drilling, 66.6% patients in immediate post operative period, 90% patients in 1-hour post operative and 100 % patients on post operative day 1, having absent DPOAE’s had drilling time more than 60 minutes. Patients more than 30 years of age are affected more, but there is no preponderance for any gender. Conclusion: Nonoperated ear does have the effect of acoustic and mechanical trauma by vibration transmitted from another side during drilling of the operative ear mastoid bone. This effect is temporary and depends on the duration of drilling also.

scholarly journals Subclinical Auditory Dysfunction: Relationship Between Distortion Product Otoacoustic Emissions and the Audiogram

2021 ◽  
pp. 1-16
Author(s):  
Naomi F. Bramhall ◽  
Garnett P. McMillan ◽  
Amy N. Mashburn
Keyword(s):  
Otoacoustic Emissions ◽  
Pure Tone ◽  
Noise Exposure ◽  
Outer Hair Cell ◽  
Self Report ◽  
Distortion Product Otoacoustic Emissions ◽  
Sample Mean ◽  
Distortion Product ◽  
Clinically Normal ◽  
Auditory Physiology

Purpose Distortion product otoacoustic emissions (DPOAEs) and audiometric thresholds have been used to account for the impacts of subclinical outer hair cell (OHC) dysfunction on auditory perception and measures of auditory physiology. However, the relationship between DPOAEs and the audiogram is unclear. This study investigated this relationship by determining how well DPOAE levels can predict the audiogram among individuals with clinically normal hearing. Additionally, the impacts of age, noise exposure, and the perception of tinnitus on the ability of DPOAE levels to predict the audiogram were evaluated. Method Suprathreshold DPOAE levels from 1 to 10 kHz and pure-tone thresholds from 0.25 to 16 kHz were measured in 366 ears from 194 young adults (19–35 years old) with clinically normal audiograms and middle ear function. The measured DPOAE levels at all frequencies were used to predict pure-tone thresholds at each frequency. Participants were grouped by age, self-reported noise exposure/Veteran status, and self-report of tinnitus. Results Including DPOAE levels in the pure-tone threshold prediction model improved threshold predictions at all frequencies from 0.25 to 16 kHz compared with a model based only on sample mean pure-tone thresholds, but these improvements were modest. DPOAE levels for f 2 frequencies of 4 and 5 kHz were particularly influential in predicting pure-tone thresholds above 4 kHz. However, prediction accuracy varied based on participant characteristics. On average, predicted pure-tone thresholds were better than measured thresholds among Veterans, individuals with tinnitus, and the oldest age group. Conclusions These results indicate a complex relationship between DPOAE levels and the audiogram. Underestimation of pure-tone thresholds for some groups suggests that additional factors other than OHC damage may impact thresholds among individuals within these categories. These findings suggest that DPOAE levels and pure-tone thresholds may differ in terms of how well they reflect subclinical OHC dysfunction. Supplemental Material https://doi.org/10.23641/asha.13564745

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