Acquisition and Repeatability of High-Frequency Distortion Product Otoacoustic Emissions Using Two Different Calibration Methods in Newborns

Hawe, Laura Dreisbach; Portugal, Nicholas; Aguilar, Eliza; Hansen, W.C.; Kite, Daniela; McIntyre, Sky; Minasian, Celine

doi:10.3390/app9152947

Cited by 4 publications

(2 citation statements)

References 73 publications

(173 reference statements)

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“…Of particular relevance, OAEs can be measured in the EHF range. Although most studies incorporate custom systems (e.g., [ 31 , 32 ]), there are also some commercial systems that provide this type of measurement [ 33 ]. Poling et al [ 31 ] have shown that EHF OAEs provide useful information in monitoring hearing during chemotherapy.…”

Section: Otoacoustic Emissionsmentioning

confidence: 99%

“…Poling et al [ 31 ] have shown that EHF OAEs provide useful information in monitoring hearing during chemotherapy. If proper calibration protocols are applied, EHF OAEs are repeatable [ 32 ] and measurable in all age groups [ 32 , 34 ]. Finally, it has recently been suggested that changes in OAEs in that range may be a good indicator of corresponding changes in EHF hearing thresholds [ 33 , 35 ].…”

Section: Otoacoustic Emissionsmentioning

confidence: 99%

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Cooling the Cochlea: Slowing Down Metabolism May Be a Way of Protecting Hearing from Surgical Trauma

Bell

Jędrzejczak

2023

Medicina

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Background and Objectives: This narrative review of the literature explores the effect of body temperature on hearing. In particular, its focus is on extended high frequency (EHF) hearing—the range beyond the standard audiometric limit of 8 kHz. Such high frequencies are the first to be affected by noise-induced hearing loss, and so monitoring them can provide an early warning sign of incipient damage. Materials and Methods: This review builds on a personal literature database of 216 references covering the general topic of EHF hearing; the procedure was to then identify papers related to whole-body or cochlear cooling. A starting point was the paper by Munjal et al. who in 2013 reported changes of up to 15–30 dB in the EHF thresholds of subjects who had undergone cardiopulmonary bypass (CBP) surgery, which typically involves mild to moderate hypothermia—cooling of the blood—to reduce cellular oxygen demand and minimise tissue damage. Results: Reviewing the surrounding literature, we find that although CBP surgery by itself can impair hearing thresholds, lower body and cochlear temperatures in general provide neuroprotective effects. A connection between hearing loss and CBP surgery has been periodically documented, but the mechanism behind it has yet to be conclusively identified. Conclusions: The observations reviewed here tend to confirm the otoprotective effects of cooling. We consider that the high sensitivity of EHF thresholds to temperature is a major factor that has not been sufficiently recognised, although it has important implications for otological research and practice. Two important inferences are that, first, monitoring EHF thresholds might have considerable value in audiology, and, second, that lowering temperature of the cochlea during cochlear implantation might provide substantially better hearing preservation, as some researchers have already suggested.

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Section: Otoacoustic Emissionsmentioning

confidence: 99%

Section: Otoacoustic Emissionsmentioning

confidence: 99%

Cooling the Cochlea: Slowing Down Metabolism May Be a Way of Protecting Hearing from Surgical Trauma

Bell

Jędrzejczak

2023

Medicina

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Descriptive Characterization of High-Frequency Distortion Product Otoacoustic Emission Source Components in Children

Dreisbach,

Konrad-Martin,

Gagner

et al. 2023

J Speech Lang Hear Res

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Purpose: Distortion product otoacoustic emissions (DPOAEs) provide an objective assessment of cochlear function and are used for serial ototoxicity monitoring in pediatric cancer patients. DPOAEs are modeled as having distortion (near f 2 ) and reflection (near 2 f 1 - f 2 ) component sources, and developmental changes are observed in these components' relative strengths in infants compared with adults. However, little is known about source component strengths in childhood or at extended high frequencies (EHFs; > 8 kHz). Thus, the purpose of this study was to describe the effects of age and stimulus frequency on DPOAE components in children. Method: DPOAEs were collected with varied frequency ratios ( f 2 / f 1 = 1.1–1.25) for a wide range of frequencies (2–16 kHz) in 39 younger (3–6 years) and 41 older (10–12 years) children with constant levels (L 1 /L 2 ) of 65/50 dB SPL. A depth-compensated simulator sound pressure level method of calibration was employed. A time waveform representation of the results across various ratios was created to estimate peak pressures and latencies of each DPOAE component. Results: Estimated peak pressures of DPOAE components revealed the greatest differences in DPOAE sources between children occurring at the highest frequencies tested, where the peak pressure of both components was largest for younger compared with older children. Latency differences between the children were only noted at higher frequencies for the distortion component. Conclusions: These results suggest that DPOAE levels decrease with age and reflection emissions are vulnerable to cochlear change. This work guides optimization of protocols for pediatric ototoxicity monitoring, whereby including EHF otoacoustic emissions is clearly warranted and choosing to isolate DPOAE sources may prove beneficial. Supplemental Material: https://doi.org/10.23641/asha.23669214

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Rethinking the clinical utility of distortion-product otoacoustic emission (DPOAE) signal-to-noise ratio

Portugal

Poling

Dreisbach

2023

International Journal of Audiology

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Acquisition and Repeatability of High-Frequency Distortion Product Otoacoustic Emissions Using Two Different Calibration Methods in Newborns

Cited by 4 publications

References 73 publications

Cooling the Cochlea: Slowing Down Metabolism May Be a Way of Protecting Hearing from Surgical Trauma

Cooling the Cochlea: Slowing Down Metabolism May Be a Way of Protecting Hearing from Surgical Trauma

Descriptive Characterization of High-Frequency Distortion Product Otoacoustic Emission Source Components in Children

Rethinking the clinical utility of distortion-product otoacoustic emission (DPOAE) signal-to-noise ratio

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