226 results on '"Buchman CA"'
Search Results
2. Influence of an intraoperative perilymph gusher on cochlear implant performance in children with labyrinthine malformations.
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Adunka OF, Teagle HF, Zdanski CJ, Buchman CA, Adunka, Oliver Franz, Teagle, Holly F B, Zdanski, Carlton J, and Buchman, Craig A
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- 2012
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3. Cochlear implant-evoked cortical activation in children with cochlear nerve deficiency.
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He S, Grose J, Hang AX, Buchman CA, He, Shuman, Grose, John, Hang, Anna X, and Buchman, Craig A
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- 2012
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4. Electrophysiological properties of cochlear implantation in the gerbil using a flexible array.
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DeMason C, Choudhury B, Ahmad F, Fitzpatrick DC, Wang J, Buchman CA, Adunka OF, DeMason, Christine, Choudhury, Baishakhi, Ahmad, Faisal, Fitzpatrick, Douglas C, Wang, Jacob, Buchman, Craig A, and Adunka, Oliver F
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- 2012
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5. Detection of intracochlear damage with cochlear implantation in a gerbil model of hearing loss.
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Choudhury B, Adunka OF, Demason CE, Ahmad FI, Buchman CA, Fitzpatrick DC, Choudhury, Baishakhi, Adunka, Oliver Franz, Demason, Christine E, Ahmad, Faisal I, Buchman, Craig A, and Fitzpatrick, Douglas C
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- 2011
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6. A gerbil model of sloping sensorineural hearing loss.
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Suberman TA, Campbell AP, Adunka OF, Buchman CA, Roche JP, Fitzpatrick DC, Suberman, Thomas A, Campbell, Adam P, Adunka, Oliver F, Buchman, Craig A, Roche, Joseph P, and Fitzpatrick, Douglas C
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- 2011
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7. Large vestibular aqueduct syndrome: Anatomic and Functional Parameters.
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Campbell AP, Adunka OF, Zhou B, Qaqish BF, and Buchman CA
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- 2011
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8. Correlation of early auditory potentials and intracochlear electrode insertion properties: an animal model featuring near real-time monitoring.
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Campbell AP, Suberman TA, Buchman CA, Fitzpatrick DC, Adunka OF, Campbell, Adam P, Suberman, Thomas A, Buchman, Craig A, Fitzpatrick, Douglas C, and Adunka, Oliver F
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- 2010
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9. Intracochlear recordings of electrophysiological parameters indicating cochlear damage.
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Adunka OF, Mlot S, Suberman TA, Campbell AP, Surowitz J, Buchman CA, Fitzpatrick DC, Adunka, Oliver F, Mlot, Stefan, Suberman, Thomas A, Campbell, Adam P, Surowitz, Joshua, Buchman, Craig A, and Fitzpatrick, Douglas C
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- 2010
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10. Sensorineural hearing loss in a pediatric population: association of congenital cytomegalovirus infection with intracranial abnormalities.
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Kimani JW, Buchman CA, Booker JK, Huang BY, Castillo M, Powell CM, and Weck KE
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- 2010
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11. Is electric acoustic stimulation better than conventional cochlear implantation for speech perception in quiet?
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Adunka OF, Pillsbury HC, Adunka MC, and Buchman CA
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- 2010
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12. Imaging characteristics of children with auditory neuropathy spectrum disorder.
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Roche JP, Huang BY, Castillo M, Bassim MK, Adunka OF, Buchman CA, Roche, Joseph P, Huang, Benjamin Y, Castillo, Mauricio, Bassim, Marc K, Adunka, Oliver F, and Buchman, Craig A
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- 2010
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13. Minimizing intracochlear trauma during cochlear implantation.
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Adunka OF, Pillsbury HC, Buchman CA, Adunka, Oliver F, Pillsbury, Harold C, and Buchman, Craig A
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- 2010
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14. Bilateral cochlear implantation: current concepts.
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Eapen RJ and Buchman CA
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- 2009
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15. Hearing-in-noise benefits after bilateral simultaneous cochlear implantation continue to improve 4 years after implantation.
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Eapen RJ, Buss E, Adunka MC, Pillsbury HC 3rd, Buchman CA, Eapen, Rose J, Buss, Emily, Adunka, Marcia Clark, Pillsbury, Harold C 3rd, and Buchman, Craig A
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- 2009
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16. Effect of preoperative residual hearing on speech perception after cochlear implantation.
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Adunka OF, Buss E, Clark MS, Pillsbury HC, and Buchman CA
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- 2008
17. Surgical factors in pediatric cochlear implantation and their early effects on electrode activation and functional outcomes.
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Francis HW, Buchman CA, Visaya JM, Wang NY, Zwolan TA, Fink NE, Niparko JK, CDaCI Investigative Team, Francis, Howard W, Buchman, Craig A, Visaya, Jiovani M, Wang, Nae-Yuh, Zwolan, Teresa A, Fink, Nancy E, and Niparko, John K
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- 2008
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18. Revision cochlear implant surgery in children.
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Cullen RD, Fayad JN, Luxford WM, and Buchman CA
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- 2008
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19. Multicenter U.S. bilateral MED-EL cochlear implantation study: speech perception over the first year of use.
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Buss E, Pillsbury HC, Buchman CA, Pillsbury CH, Clark MS, Haynes DS, Labadie RF, Amberg S, Roland PS, Kruger P, Novak MA, Wirth JA, Black JM, Peters R, Lake J, Wackym PA, Firszt JB, Wilson BS, Lawson DT, and Schatzer R
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- 2008
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20. Scala tympani cochleostomy II: topography and histology.
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Adunka OF, Radeloff A, Gstoettner WK, Pillsbury HC, and Buchman CA
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- 2007
21. Scala tympani cochleostomy I: results of a survey.
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Adunka OF and Buchman CA
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- 2007
22. Auditory neuropathy characteristics in children with cochlear nerve deficiency.
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Buchman CA, Roush PA, Teagle HFB, Brown CJ, Zdanski CJ, and Grose JH
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- 2006
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23. Monitoring of cochlear function during cochlear implantation.
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Adunka O, Roush P, Grose J, Macpherson C, and Buchman CA
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- 2006
24. Bilateral cochlear implantation: current concepts.
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Das S, Buchman CA, Das, Subinoy, and Buchman, Craig A
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- 2005
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25. Cochlear implantation in patients with substantial residual hearing.
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Cullen RD, Higgins C, Buss E, Clark M, Pillsbury HC III, and Buchman CA
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- 2004
26. Vestibular effects of cochlear implantation.
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Buchman CA, Joy J, Hodges A, Telischi FF, and Balkany TJ
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- 2004
27. Illness and otological changes during upper respiratory virus infection.
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Doyle WJ, Alper CM, Buchman CA, Moody SA, Skoner DP, and Cohen S
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- 1999
28. Another cause for conductive hearing loss with present acoustic reflexes.
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Ebert CS Jr, Zanation AM, and Buchman CA
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- 2008
29. Effects of frequency compression hearing aids for unilaterally implanted children with acoustically amplified residual hearing in the nonimplanted ear.
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Park LR, Teagle HF, Buss E, Roush PA, and Buchman CA
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- 2012
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30. Endolymphatic sac abscess in the setting of enlarged vestibular aqueduct syndrome.
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Stadler ME, Huang BY, Campbell A, Buchman CA, Adunka OF, Stadler, Michael E, Huang, Benjamin Y, Campbell, Adam, Buchman, Craig A, and Adunka, Oliver F
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- 2011
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31. Minimum intraoperative testing battery for cochlear implantation: the international practice trend.
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Aljazeeri I, Abdelsamad Y, Alsanosi A, Hagr A, Kim AH, Ramos-Macias A, de Miguel AR, Kurz A, Lorens A, Gantz B, Buchman CA, Távora-Vieira D, Sprinzl G, Mertens G, Saunders JE, Kosaner J, Telmesani LM, Lassaletta L, Bance M, Yousef M, Holcomb MA, Adunka O, Cayé-Thomasen P, Skarzynski PH, Rajeswaran R, Briggs RJ, Oh SH, Plontke SK, O'Leary SJ, Agrawal S, Yamasoba T, Lenarz T, Wesarg T, Kutz W, Connolly P, Anderson I, and Alzhrani F
- Abstract
Purpose: In cochlear implantation (CI) surgery, there are a wide variety of intraoperative tests available. However, no clear guide exists on which tests must be performed as the minimum intraoperative testing battery. Toward this end, we studied the usage patterns, recommendations, and attitudes of practitioners toward intraoperative testing., Methods: This study is a multicentric international survey of tertiary referral CI centers. A survey was developed and administered to a group of CI practitioners (n = 34) including otologists, audiologists and biomedical engineers. Thirty six participants were invited to participate in this study based on a their scientific outputs to the literature on the intraoperative testing in CI field and based on their high load of CI surgeries. Thirty four, from 15 countries have accepted the invitation to participate. The participants were asked to indicate the usage trends, perceived value, influence on decision making and duration of each intraoperative test. They were also asked to indicate which tests they believe should be included in a minimum test battery for routine cases., Results: Thirty-two (94%) experts provided responses. The most frequently recommended tests for a minimum battery were facial nerve monitoring, electrode impedance measurements, and measurements of electrically evoked compound action potentials (ECAPs). The perceived value and influence on surgical decision-making also varied, with high-resolution CT being rated the highest on both measures., Conclusion: Facial nerve monitoring, electrode impedance measurements, and ECAP measurements are currently the core tests of the intraoperative test battery for CI surgery., (© 2024. The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.)
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- 2024
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32. Electrocochleography-Based Tonotopic Map: I. Place Coding of the Human Cochlea With Hearing Loss.
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Walia A, Ortmann AJ, Lefler S, Holden TA, Puram SV, Herzog JA, and Buchman CA
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Objectives: Due to the challenges of direct in vivo measurements in humans, previous studies of cochlear tonotopy primarily utilized human cadavers and animal models. This study uses cochlear implant electrodes as a tool for intracochlear recordings of acoustically evoked responses to achieve two primary goals: (1) to map the in vivo tonotopy of the human cochlea, and (2) to assess the impact of sound intensity and the creation of an artificial "third window" on this tonotopic map., Design: Fifty patients with hearing loss received cochlear implant electrode arrays. Postimplantation, pure-tone acoustic stimuli (0.25 to 4 kHz) were delivered, and electrophysiological responses were recorded from all 22 electrode contacts. The analysis included fast Fourier transformation to determine the amplitude of the first harmonic, indicative of predominantly outer hair cell activity, and tuning curves to identify the best frequency (BF) electrode. These measures, coupled with postoperative imaging for precise electrode localization, facilitated the construction of an in vivo frequency-position function. The study included a specific examination of 2 patients with auditory neuropathy spectrum disorder (ANSD), with preserved cochlear function as assessed by present distortion-product otoacoustic emissions, to determine the impact of sound intensity on the frequency-position map. In addition, the electrophysiological map was recorded in a patient undergoing a translabyrinthine craniotomy for vestibular schwannoma removal, before and after creating an artificial third window, to explore whether an experimental artifact conducted in cadaveric experiments, as was performed in von Békésy landmark experiments, would produce a shift in the frequency-position map., Results: A significant deviation from the Greenwood model was observed in the electrophysiological frequency-position function, particularly at high-intensity stimulations. In subjects with hearing loss, frequency tuning, and BF location remained consistent across sound intensities. In contrast, ANSD patients exhibited Greenwood-like place coding at low intensities (~40 dB SPL) and a basal shift in BF location at higher intensities (~70 dB SPL or greater). Notably, creating an artificial "third-window" did not alter the frequency-position map., Conclusions: This study successfully maps in vivo tonotopy of human cochleae with hearing loss, demonstrating a near-octave shift from traditional frequency-position maps. In patients with ANSD, representing more typical cochlear function, intermediate intensity levels (~70 to 80 dB SPL) produced results similar to high-intensity stimulation. These findings highlight the influence of stimulus intensity on the cochlear operational point in subjects with hearing loss. This knowledge could enhance cochlear implant programming and improve auditory rehabilitation by more accurately aligning electrode stimulation with natural cochlear responses., (Copyright © 2024 Wolters Kluwer Health, Inc. All rights reserved.)
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- 2024
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33. Amplitude Parameters Are Predictive of Hearing Preservation in a Randomized Controlled Trial of Intracochlear Electrocochleography During Cochlear Implant Surgery.
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Harris MS, Koka K, Thompson-Harvey A, Harvey E, Riggs WJ, Saleh S, Holder JT, Dwyer RT, Prentiss SM, Lefler SM, Kozlowski K, Hiss MM, Ortmann AJ, Nelson-Bakkum ER, Büchner A, Salcher R, Harvey SA, Hoffer ME, Bohorquez JE, Alzhrani F, Alshihri R, Almuhawas F, Danner CJ, Friedland DR, Seidman MD, Lenarz T, Telischi FF, Labadie RF, Buchman CA, and Adunka OF
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- Humans, Female, Middle Aged, Aged, Male, Prospective Studies, Cochlear Implants, Cochlea surgery, Cochlea physiopathology, Adult, Hearing physiology, Audiometry, Pure-Tone, Audiometry, Evoked Response methods, Cochlear Implantation methods, Hearing Loss, Sensorineural surgery, Hearing Loss, Sensorineural physiopathology
- Abstract
Objective: To prospectively evaluate the association between hearing preservation after cochlear implantation (CI) and intracochlear electrocochleography (ECochG) amplitude parameters., Study Design: Multi-institutional, prospective randomized clinical trial., Setting: Ten high-volume, tertiary care CI centers., Patients: Adults (n = 87) with sensorineural hearing loss meeting CI criteria (2018-2021) with audiometric thresholds of ≤80 dB HL at 500 Hz., Methods: Participants were randomized to CI surgery with or without audible ECochG monitoring. Electrode arrays were inserted to the full-depth marker. Hearing preservation was determined by comparing pre-CI, unaided low-frequency (125-, 250-, and 500-Hz) pure-tone average (LF-PTA) to LF-PTA at CI activation. Three ECochG amplitude parameters were analyzed: 1) insertion track patterns, 2) magnitude of ECochG amplitude change, and 3) total number of ECochG amplitude drops., Results: The Type CC insertion track pattern, representing corrected drops in ECochG amplitude, was seen in 76% of cases with ECochG "on," compared with 24% of cases with ECochG "off" ( p = 0.003). The magnitude of ECochG signal drop was significantly correlated with the amount of LF-PTA change pre-CI and post-CI ( p < 0.05). The mean number of amplitude drops during electrode insertion was significantly correlated with change in LF-PTA at activation and 3 months post-CI ( p ≤ 0.01)., Conclusions: ECochG amplitude parameters during CI surgery have important prognostic utility. Higher incidence of Type CC in ECochG "on" suggests that monitoring may be useful for surgeons in order to recover the ECochG signal and preventing potentially traumatic electrode-cochlear interactions., (Copyright © 2024, Otology & Neurotology, Inc.)
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- 2024
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34. Validating an Evoked Potential Platform for Electrocochleography During Cochlear Implantation.
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Varghese JJ, Shew MA, Walia A, Lefler SM, Durakovic N, Wick CC, Ortmann AJ, Herzog JA, and Buchman CA
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Objective: To validate electrocochleography (ECochG) between an auditory evoked potential (AEP) machine and an established cochlear implant (CI) manufacturer ECochG system., Methods: Intraoperative validation study at a tertiary referral center. Patients included adults and children undergoing cochlear implantation. Intraoperative ECochG was measured with both the Intelligent Hearing Systems (IHS) Duet AEP machine and Cochlear Corporation (CC) ECochG platform. Recording electrodes captured extracochlear measurements through a standard facial recess. Tone-bursts were presented from 250 Hz to 2 kHz (~110 dB SPL). A fast Fourier transform (FFT) of ECochG waveforms at key frequencies was summed into a total response (ECochG-TR). Pearson's correlation was utilized to evaluate the relationship between IHS-ECochG-TR and CC-ECochG-TR after confirming normality., Results: Thirty patients were enrolled with an average age of 67 years (SD 18.8). In the ear that was implanted, mean preoperative pure-tone average (PTA; 0.5, 1, 2, and 4 kHz) was 87.4 dB HL (SD 19.3) and mean preoperative word-recognition scores (WRS) was 17.0% correct (SD 19.1). There was strong correlation (r = 0.905, 95% confidence interval: 0.809 to 0.954) between IHS-ECochG-TR (median 2.30 μV, range 0.1-148.26) and CC-ECochG-TR (median 3.00 μV, range 0.1-239.63). Four patients underwent transtympanic ECochG with the IHS system for feasibility evaluation and achieved similar responses., Conclusion: Extracochlear ECochG has been predictive of CI speech perception performance. The IHS duet system is a valid measure of extracochlear ECochG for the CI population. Future work will utilize this system for measuring transtympanic ECochG to improve preoperative estimation of CI performance., Level of Evidence: 3 Laryngoscope, 2024., (© 2024 The American Laryngological, Rhinological and Otological Society, Inc.)
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- 2024
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35. Alzheimer's Disease-Related Analytes Amyloid-β and Tau in Perilymph: Correlation With Patient Age and Cognitive Score.
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Walia A, Shew MA, Durakovic N, Herzog JA, Cirrito JR, Yuede CM, Wick CC, Manis M, Holtzman DM, Buchman CA, and Rutherford MA
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Objective: To describe the collection methods for perilymph fluid biopsy during cochlear implantation, detect levels of amyloid β 42 and 40 (Aβ
42 and Aβ40 ), and total tau (tTau) analytes with a high-precision assay, to compare these levels with patient age and Montreal Cognitive Assessment (MoCA) scores, and explore potential mechanisms and relationships with otic pathology., Study Design: Prospective study., Setting: Tertiary referral center., Methods: Perilymph was collected from 25 patients using polyimide tubing to avoid amyloid adherence to glass, and analyzed with a single-molecule array advanced digital enzyme-linked immunosorbent assay platform for Aβ40 , Aβ42 , and tTau. Cognition was assessed by MoCA., Results: Perilymph volumes ranged from ∼1 to 13 µL, with analyte concentrations spanning 2.67 to 1088.26 pg/mL. All samples had detectable levels of tTau, Aβ40 , and Aβ42 , with a significant positive correlation between Aβ42 and Aβ40 levels. Levels of Aβ42 , Aβ40 , and tTau were positively correlated with age, while MoCA scores were inversely correlated with age. tTau and Aβ42 /Aβ40 -ratios were significantly correlated with MoCA scores., Conclusion: Alzheimer's disease-associated peptides Aβ42 , Aβ40 , and tau analytes are detectable in human perilymph at levels approximately 10-fold lower than those found in cerebrospinal fluid (CSF). These species increase with age and correlate with cognitive impairment indicators, suggesting their potential utility as biomarkers for cognitive impairment in patients undergoing cochlear implantation. Future research should investigate the origin of these analytes in the perilymph and their potential links to inner ear pathologies and hearing loss, as well as their relationships to CSF and plasma levels in individuals., (© 2024 American Academy of Otolaryngology–Head and Neck Surgery Foundation.)- Published
- 2024
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36. International Consensus Statements on Intraoperative Testing for Cochlear Implantation Surgery.
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Alzhrani F, Aljazeeri I, Abdelsamad Y, Alsanosi A, Kim AH, Ramos-Macias A, Ramos-de-Miguel A, Kurz A, Lorens A, Gantz B, Buchman CA, Távora-Vieira D, Sprinzl G, Mertens G, Saunders JE, Kosaner J, Telmesani LM, Lassaletta L, Bance M, Yousef M, Holcomb MA, Adunka O, Thomasen PC, Skarzynski PH, Rajeswaran R, Briggs RJ, Oh SH, Plontke S, O'Leary SJ, Agrawal S, Yamasoba T, Lenarz T, Wesarg T, Kutz W, Connolly P, Anderson I, and Hagr A
- Abstract
Objectives: A wide variety of intraoperative tests are available in cochlear implantation. However, no consensus exists on which tests constitute the minimum necessary battery. We assembled an international panel of clinical experts to develop, refine, and vote upon a set of core consensus statements., Design: A literature review was used to identify intraoperative tests currently used in the field and draft a set of provisional statements. For statement evaluation and refinement, we used a modified Delphi consensus panel structure. Multiple interactive rounds of voting, evaluation, and feedback were conducted to achieve convergence., Results: Twenty-nine provisional statements were included in the original draft. In the first voting round, consensus was reached on 15 statements. Of the 14 statements that did not reach consensus, 12 were revised based on feedback provided by the expert practitioners, and 2 were eliminated. In the second voting round, 10 of the 12 revised statements reached a consensus. The two statements which did not achieve consensus were further revised and subjected to a third voting round. However, both statements failed to achieve consensus in the third round. In addition, during the final revision, one more statement was decided to be deleted due to overlap with another modified statement., Conclusions: A final core set of 24 consensus statements was generated, covering wide areas of intraoperative testing during CI surgery. These statements may provide utility as evidence-based guidelines to improve quality and achieve uniformity of surgical practice., Competing Interests: The authors have no conflicts of interest to disclose., (Copyright © 2024 The Authors. Ear & Hearing is published on behalf of the American Auditory Society, by Wolters Kluwer Health, Inc.)
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- 2024
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37. Electrocochleography-Based Tonotopic Map: II. Frequency-to-Place Mismatch Impacts Speech-Perception Outcomes in Cochlear Implant Recipients.
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Walia A, Shew MA, Varghese J, Lefler SM, Bhat A, Ortmann AJ, Herzog JA, and Buchman CA
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Objectives: Modern cochlear implants (CIs) use varying-length electrode arrays inserted at varying insertion angles within variably sized cochleae. Thus, there exists an opportunity to enhance CI performance, particularly in postlinguistic adults, by optimizing the frequency-to-place allocation for electrical stimulation, thereby minimizing the need for central adaptation and plasticity. There has been interest in applying Greenwood or Stakhovskaya et al. function (describing the tonotopic map) to postoperative imaging of electrodes to improve frequency allocation and place coding. Acoustically-evoked electrocochleography (ECochG) allows for electrophysiologic best-frequency (BF) determination of CI electrodes and the potential for creating a personalized frequency allocation function. The objective of this study was to investigate the correlation between early speech-perception performance and frequency-to-place mismatch., Design: This retrospective study included 50 patients who received a slim perimodiolar electrode array. Following electrode insertion, five acoustic pure-tone stimuli ranging from 0.25 to 2 kHz were presented, and electrophysiological measurements were collected across all 22 electrode contacts. Cochlear microphonic tuning curves were subsequently generated for each stimulus frequency to ascertain the BF electrode or the location corresponding to the maximum response amplitude. Subsequently, we calculated the difference between the stimulus frequency and the patient's CI map's actual frequency allocation at each BF electrode, reflecting the frequency-to-place mismatch. BF electrocochleography-total response (BF-ECochG-TR), a measure of cochlear health, was also evaluated for each subject to control for the known impact of this measure on performance., Results: Our findings showed a moderate correlation (r = 0.51; 95% confidence interval: 0.23 to 0.76) between the cumulative frequency-to-place mismatch, as determined using the ECochG-derived BF map (utilizing 500, 1000, and 2000 Hz), and 3-month performance on consonant-nucleus-consonant words (N = 38). Larger positive mismatches, shifted basal from the BF map, led to enhanced speech perception. Incorporating BF-ECochG-TR, total mismatch, and their interaction in a multivariate model explained 62% of the variance in consonant-nucleus-consonant word scores at 3 months. BF-ECochG-TR as a standalone predictor tended to overestimate performance for subjects with larger negative total mismatches and underestimated the performance for those with larger positive total mismatches. Neither cochlear diameter, number of cochlear turns, nor apical insertion angle accounted for the variability in total mismatch., Conclusions: Comparison of ECochG-BF derived tonotopic electrode maps to the frequency allocation tables reveals substantial mismatch, explaining 26.0% of the variability in CI performance in quiet. Closer examination of the mismatch shows that basally shifted maps at high frequencies demonstrate superior performance at 3 months compared with those with apically shifted maps (toward Greenwood and Stakhovskaya et al.). The implications of these results suggest that electrophysiological-based frequency reallocation might lead to enhanced speech-perception performance, especially when compared with conventional manufacturer maps or anatomic-based mapping strategies. Future research, exploring the prospective use of ECochG-based mapping techniques for frequency allocation is underway., (Copyright © 2024 Wolters Kluwer Health, Inc. All rights reserved.)
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- 2024
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38. Use of Diagnostic Audiology and Cochlear Implantation in the US.
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Zhan KY, Mazul A, Kallogjeri DL, and Buchman CA
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- Humans, Hearing Tests, Cochlear Implantation, Audiology, Cochlear Implants, Hearing Loss, Sensorineural surgery, Speech Perception
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- 2024
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39. Individual Patient Comorbidities and Effect on Cochlear Implant Performance.
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Dang S, Kallogjeri D, Dizdar K, Lee D, Bao JW, Varghese J, Walia A, Zhan K, Youssef S, Durakovic N, Wick CC, Herzog JA, Buchman CA, Piccirillo JF, and Shew MA
- Subjects
- Adult, Humans, Retrospective Studies, Comorbidity, Treatment Outcome, Cochlear Implantation, Cochlear Implants, Speech Perception
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Objective: To examine the association between preoperative comorbidities and cochlear implant speech outcomes., Study Design: Retrospective cohort., Setting: Tertiary referral center., Patients: A total of 976 patients who underwent cochlear implantation (CI) between January 2015 and May 2022. Adult patients with follow-up, preoperative audiologic data, and a standardized anesthesia preoperative note were included., Exposure: Adult Comorbidity Evaluation 27 (ACE-27) based on standardized anesthesia preoperative notes., Main Outcome Measures: Postoperative change in consonant-nucleus-consonant (CNC) score, AzBio Sentence score in quiet, and AzBio + 10 dB signal-to-noise ratio (SNR). Sentence score of the implanted ear at 3, 6, and 12 months., Results: A total of 560 patients met inclusion criteria; 112 patients (20%) had no comorbidity, 204 patients (36.4%) had mild comorbidities, 161 patients (28.8%) had moderate comorbidities, and 83 patients (14.8%) had severe comorbidities. Mixed model analysis revealed all comorbidity groups achieved a clinically meaningful improvement in all speech outcome measures over time. This improvement was significantly different between comorbidity groups over time for AzBio Quiet ( p = 0.045) and AzBio + 10 dB SNR ( p = 0.0096). Patients with severe comorbidities had worse outcomes. From preop to 12 months, the estimated marginal mean difference values (95% confidence interval) between the no comorbidity group and the severe comorbidity group were 52.3 (45.7-58.9) and 32.5 (24.6-40.5), respectively, for AzBio Quiet; 39.5 (33.8-45.2) and 21.2 (13.6-28.7), respectively, for AzBio + 10 dB SNR; and 43.9 (38.7-49.0) and 31.1 (24.8-37.4), respectively, for CNC., Conclusions: Comorbidities as assessed by ACE-27 are associated with CI performance. Patients with more severe comorbidities have clinically meaningful improvement but have worse outcome compared to patients with no comorbidities., Competing Interests: Conflicts of interests: DK and JFP own stock options for PotentiaMetrics, but the work of the company is not related to the present article. CCW is a consultant for Stryker Corporation and Cochlear Ltd.; JAH is a consultant for Cochlear Ltd., CAB is a consultant for Advanced Bionics, Cochlear Ltd., Envoy, and IotaMotion and has equity interest in Advanced Cochlear Diagnostics, LLC.; MAS is a consultant for Cochlear Ltd., (Copyright © 2024, Otology & Neurotology, Inc.)
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- 2024
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40. Identifying Slim Modiolar Electrode Tip Fold-Over With Intracochlear Electrocochleography.
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Varghese JJ, Walia A, Lefler SM, Ortmann AJ, Shew MA, Durakovic N, Wick CC, Herzog JA, and Buchman CA
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- Adult, Child, Humans, Audiometry, Evoked Response methods, Prospective Studies, Cochlea diagnostic imaging, Cochlea surgery, Cochlear Implants, Cochlear Implantation methods
- Abstract
Objective: To evaluate the predictive value of intracochlear electrocochleography (ECochG) for identifying tip fold-over during cochlear implantation (CI) using the slim modiolar electrode (SME) array., Study Design: Prospective cohort study., Setting: Tertiary referral center., Methods: From July 2022 to June 2023, 142 patients, including adults and children, underwent intracochlear ECochG monitoring during and after SME placement. Tone-bursts were presented from 250 Hz to 2 kHz at 108 to 114 dB HL. A fast Fourier transform (FFT) allowed for frequency-specific evaluation of ECochG response. ECochG patterns during insertion and postinsertion were evaluated using sensitivity and specificity analysis to predict tip fold-over. Intraoperative plain radiographs served as a reference standard., Results: Fifteen tip fold-over cases occurred (10.6%) with significant ECochG response (>2 µV). Sixty-one cases without tip fold-over occurred (43.0%) with significant ECochG response. All tip fold-overs had both a nontonotopic postinsertion sweep and nonrobust active insertion pattern. No patients with robust insertion or tonotopic sweep patterns had tip fold-over. Sensitivity of detecting tip fold-over when having both nonrobust insertion and nontonotopic sweep patterns was 100% (95% confidence inteval [CI] 78.2%-100%), specificity was 68.9% (95% CI 55.7%-80.1%), and the overall accuracy was 72.0% (95% CI 60.5%-81.7%)., Conclusion: Intracochlear ECochG monitoring during cochlear implantation with the SME can be a valuable tool for identifying properly positioned electrode arrays. In cases where ECochG patterns are nonrobust on insertion and nontonotopic for electrode sweeps, there may be a concern for tip fold-over, and intraoperative imaging is necessary to confirm proper insertion., (© 2023 American Academy of Otolaryngology–Head and Neck Surgery Foundation.)
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- 2024
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41. Single-cell multi-omic analysis of the vestibular schwannoma ecosystem uncovers a nerve injury-like state.
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Barrett TF, Patel B, Khan SM, Mullins RDZ, Yim AKY, Pugazenthi S, Mahlokozera T, Zipfel GJ, Herzog JA, Chicoine MR, Wick CC, Durakovic N, Osbun JW, Shew M, Sweeney AD, Patel AJ, Buchman CA, Petti AA, Puram SV, and Kim AH
- Subjects
- Humans, Ecosystem, Multiomics, Schwann Cells metabolism, Signal Transduction physiology, Single-Cell Analysis, Tumor Microenvironment, Neuroma, Acoustic genetics, Neuroma, Acoustic metabolism, Neuroma, Acoustic pathology
- Abstract
Vestibular schwannomas (VS) are benign tumors that lead to significant neurologic and otologic morbidity. How VS heterogeneity and the tumor microenvironment (TME) contribute to VS pathogenesis remains poorly understood. In this study, we perform scRNA-seq on 15 VS, with paired scATAC-seq (n = 6) and exome sequencing (n = 12). We identify diverse Schwann cell (SC), stromal, and immune populations in the VS TME and find that repair-like and MHC-II antigen-presenting SCs are associated with myeloid cell infiltrate, implicating a nerve injury-like process. Deconvolution analysis of RNA-expression data from 175 tumors reveals Injury-like tumors are associated with larger tumor size, and scATAC-seq identifies transcription factors associated with nerve repair SCs from Injury-like tumors. Ligand-receptor analysis and in vitro experiments suggest that Injury-like VS-SCs recruit myeloid cells via CSF1 signaling. Our study indicates that Injury-like SCs may cause tumor growth via myeloid cell recruitment and identifies molecular pathways that may be therapeutically targeted., (© 2023. The Author(s).)
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- 2024
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42. Longitudinal Analysis of Early Hearing Detection and Intervention Program Performance.
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Mahal R, Bluher A, Kallogjeri D, Seeser J, Piccirillo J, and Buchman CA
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- Infant, Child, Infant, Newborn, Humans, Retrospective Studies, Neonatal Screening, Hearing Tests, Hearing, Hearing Loss diagnosis, Deafness diagnosis
- Abstract
Objectives: Early hearing detection and intervention (EHDI) is a newborn hearing screening system created to detect infants with hearing loss (HL) and intervene to reduce language and communication impairment. Early hearing detection (EHD) consists of three sequential stages: identification, screening, and diagnostic testing. This study longitudinally reviews each stage of EHD in each state and proposes a framework to improve utilization of EHD data., Design: A retrospective public database review was conducted, accessing publicly available data from the Centers for Disease Control and Prevention. Summary descriptive statistics were utilized to generate a descriptive study of EHDI programs in each U.S. state from 2007 to 2016., Results: Data over 10 years from 50 states as well as Washington, DC were included in this analysis, creating up to 510 data points per analysis. Hundred percent (85 to 105) (median [min to max]) of newborns were identified by and entered EHDI programs. Ninety-eight percent (51 to 100) of identified infants completed screening. Of the infants who screened positive for HL, the proportion that received diagnostic testing was 55% (1 to 100). The overall proportion of infants who failed to complete EHD was 3% (1 to 51). Of the infants who fail to complete EHD 70% (0 to 100) are from missed screenings, 24% (0 to 95) are from missed diagnostic testing, and 0% (0 to 93) are from missed identification. Although there are more infants missed at screening, it was estimated, with limitations, that there is an order of magnitude more infants with HL among those who did not complete diagnostic testing compared with those who did not complete screening., Conclusions: Analysis demonstrates high completion rates at both identification and screening stages, whereas the diagnostic testing stage demonstrates low and highly variable completion rates. The low completion rates at diagnostic testing create a bottleneck in the EHD process and the large variability impedes the comparison of HL outcomes across states. Analysis also demonstrates that among all stages of EHD, whereas the largest number of infants are missed at screening, the largest number of children with HL are likely missed at diagnostic testing. Therefore, a focus by individual EHDI programs on addressing causes of low diagnostic testing completion rates would yield the greatest increase in the identification of children with HL. Potential causes of low diagnostic testing completion rates are further discussed. Finally, a new vocabulary framework is proposed to facilitate further study of EHD outcomes., (Copyright © 2023 Wolters Kluwer Health, Inc. All rights reserved.)
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- 2024
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43. Improved Cochlear Implant Performance Estimation Using Tonotopic-Based Electrocochleography.
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Walia A, Shew MA, Varghese J, Ioerger P, Lefler SM, Ortmann AJ, Herzog JA, and Buchman CA
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- Adult, Humans, Male, Aged, Female, Audiometry, Evoked Response methods, Cross-Sectional Studies, Treatment Outcome, Cochlear Implantation methods, Cochlear Implants, Hearing Loss, Speech Perception physiology
- Abstract
Importance: Cochlear implantation produces remarkable results in postlingual deafness, although auditory outcomes vary. Electrocochleography (ECochG) has emerged as a valuable tool for assessing the cochlear-neural substrate and evaluating patient prognosis., Objective: To assess whether ECochG-total response (ECochG-TR) recorded at the best-frequency electrode (BF-ECochG-TR) correlates more strongly with speech perception performance than ECochG-TR measured at the round window (RW-ECochG-TR)., Design, Setting, and Participants: This single-center cross-sectional study recruited 142 patients from July 1, 2021, to April 30, 2022, with 1-year follow-up. Exclusions included perilymph suctioning, crimped sound delivery tubes, non-native English speakers, inner ear malformations, nonpatent external auditory canals, or cochlear implantation revision surgery., Exposures: Cochlear implantation., Main Outcomes and Measures: Speech perception testing, including the consonant-nucleus-consonant (CNC) words test, AzBio sentences in quiet, and AzBio sentences in noise plus 10-dB signal to noise ratio (with low scores indicating poor performance and high scores indicating excellent performance on all tests), at 6 months postoperatively; and RW-ECochG-TR and BF-ECochG-TR (measured for 250, 500, 1000, and 2000 Hz)., Results: A total of 109 of the 142 eligible postlingual adults (mean [SD] age, 68.7 [15.8] years; 67 [61.5%] male) were included in the study. Both BF-ECochG-TR and RW-ECochG-TR were correlated with 6-month CNC scores (BF-ECochG-TR: r = 0.74; 95% CI, 0.62-0.82; RW-ECochG-TR: r = 0.67; 95% CI, 0.54-0.76). A multivariate model incorporating age, duration of hearing loss, and angular insertion depth did not outperform BF-ECochG-TR or RW-ECochG-TR alone. The BF-ECochG-TR correlation with CNC scores was significantly stronger than the RW-ECochG-TR correlation (r difference = -0.18; 95% CI, -0.31 to -0.01; z = -2.02). More moderate correlations existed between 6-month AzBio scores in noise, Montreal Cognitive Assessment (MoCA) scores (r = 0.46; 95% CI, 0.29-0.60), and BF-ECochG-TR (r = 0.42; 95% CI, 0.22-0.58). MoCA and the interaction between BF-ECochG-TR and MoCA accounted for a substantial proportion of variability in AzBio scores in noise at 6 months (R2 = 0.50; 95% CI, 0.36-0.61)., Conclusions and Relevance: In this case series, BF-ECochG-TR was identified as having a stronger correlation with cochlear implantation performance than RW-ECochG-TR, although both measures highlight the critical role of the cochlear-neural substrate on outcomes. Demographic, audiologic, and surgical factors demonstrated weak correlations with cochlear implantation performance, and performance in noise was found to require a robust cochlear-neural substrate (BF-ECochG-TR) as well as sufficient cognitive capacity (MoCA). Future cochlear implantation studies should consider these variables when assessing performance and related interventions.
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- 2023
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44. Factors Affecting Performance in Adults With Cochlear Implants: A Role for Cognition and Residual Cochlear Function.
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Walia A, Shew MA, Lefler SM, Ortmann AJ, Durakovic N, Wick CC, Herzog JA, and Buchman CA
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- Adult, Humans, Prospective Studies, Cochlea surgery, Cognition, Cochlear Implants, Cochlear Implantation, Speech Perception physiology
- Abstract
Objective: To evaluate the impact of preoperative and perioperative factors on postlinguistic adult cochlear implant (CI) performance and design a multivariate prediction model., Study Design: Prospective cohort study., Setting: Tertiary referral center., Patients and Interventions: Two hundred thirty-nine postlinguistic adult CI recipients., Main Outcome Measures: Speech-perception testing (consonant-nucleus-consonant [CNC], AzBio in noise +10-dB signal-to-noise ratio) at 3, 6, and 12 months postoperatively; electrocochleography-total response (ECochG-TR) at the round window before electrode insertion., Results: ECochG-TR strongly correlated with CNC word score at 6 months ( r = 0.71, p < 0.0001). A multivariable linear regression model including age, duration of hearing loss, angular insertion depth, and ECochG-TR did not perform significantly better than ECochG-TR alone in explaining the variability in CNC. AzBio in noise at 6 months had moderate linear correlations with Montreal Cognitive Assessment (MoCA; r = 0.38, p < 0.0001) and ECochG-TR ( r = 0.42, p < 0.0001). ECochG-TR and MoCA and their interaction explained 45.1% of the variability in AzBio in noise scores., Conclusions: This study uses the most comprehensive data set to date to validate ECochG-TR as a measure of cochlear health as it relates to suitability for CI stimulation, and it further underlies the importance of the cochlear neural substrate as the main driver in speech perception performance. Performance in noise is more complex and requires both good residual cochlear function (ECochG-TR) and cognition (MoCA). Other demographic, audiologic, and surgical variables are poorly correlated with CI performance suggesting that these are poor surrogates for the integrity of the auditory substrate., Competing Interests: The authors disclose no conflicts of interest., (Copyright © 2023, Otology & Neurotology, Inc.)
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- 2023
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45. Cognitive Assessment in Elderly Cochlear Implant Recipients: Long-Term Analysis.
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Herzog JA, Buchman CA, Kallogjeri D, Chen S, Wick C, Durakovic N, and Shew MA
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- Humans, Aged, Retrospective Studies, Cognition, Treatment Outcome, Cochlear Implants psychology, Cochlear Implantation methods, Cognitive Dysfunction, Speech Perception
- Abstract
Objectives: To examine long-term speech and cognition outcomes in older adult cochlear implant (CI) recipients. First, by evaluating if CI performance was maintained over an extended follow-up period regardless of preoperative cognitive status. Secondly, by evaluating if there was a difference in the rate of cognitive decline between preoperative mild and normal cognition following CI over an extended period of time., Study Design and Setting: Retrospective cohort study., Methods: CI recipients ≥65 years of age implanted between 2009 and 2014 with 4+ years follow up. Pre- and postoperative audiometric and speech outcome assessments were collected. Cognitive status was measured using the mini mental status examination (MMSE) at numerous time points., Results: Fifty-three patients met inclusion. Patients were divided into two groups based on preoperative MMSE with scores considered normal (28-30) and those with mildly impaired cognition (MIC, scores 25-27). Audiometric and speech performance improved significantly at one-year post implantation and this was maintained without significant change at 4+ years, regardless of cognitive status. Mixed modeling analysis controlling for age demonstrated no significant difference in the rate of cognitive decline at 4+ years post implantation between the normal cognition cohort (1.74; 95%CI 0.89-2.6) and MIC (2.9; 95%1.91-3.88)., Conclusion: Speech performance was significantly improved and sustained after CI in both normal cognition and MIC patients. The rate of cognitive decline in older adult CI patients appears to be similar regardless of preoperative cognitive status. Although results demonstrate rates of cognitive decline following CI did not differ between cognition groups over 4+ years, future studies will need to further investigate this over extended time periods with a more comprehensive cognitive testing battery., Level of Evidence: 4 Laryngoscope, 133:2379-2387, 2023., (© 2022 The American Laryngological, Rhinological and Otological Society, Inc.)
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- 2023
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46. One-Year Hearing Preservation and Speech Outcomes Comparing Slim Modiolar and Lateral Wall Arrays.
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Zhan KY, Walia A, Durakovic N, Wick CC, Buchman CA, Shew MA, and Herzog JA
- Subjects
- Adult, Aged, Aged, 80 and over, Humans, Audiometry, Pure-Tone, Cochlea surgery, Hearing physiology, Retrospective Studies, Speech, Treatment Outcome, Middle Aged, Cochlear Implantation, Cochlear Implants, Speech Perception physiology
- Abstract
Objective: Compare postoperative speech outcomes in hearing preservation (HP) cochlear implantation (CI) patients with a low-frequency pure-tone average (LFPTA) ≤ 60 dB using 2 electrode array designs., Study Design: Retrospective cohort study., Setting: Large academic cochlear implant referral center., Methods: We reviewed adult HP CI cases using either the slim modiolar electrode (SME) (CI 532/CI 632) or th slim lateral wall electrode (SLWE) (CI 624). One-year speech outcomes and HP status were the primary outcomes., Results: A total of 132 implanted ears were analyzed (mean age 73.1 years, standard deviation [SD] 12.6), with 72% (N = 95) with CI 532/632 and 28% (N = 37) with CI 624. The mean preoperative LFPTA was 44.8 dB, SD 11.8. One-year functional HP was 27.2% (mean LFPTA shift 46.1 dB, SD 22.1) and was as follows: SME 23.9% and SLWE 36.4%, p = .168. The mean age at implantation was significantly younger only in SLWE patients with preserved hearing (66.9 vs 80.3 years, p = .008). At 6 months, speech measures were significantly better in all outcomes in HP patients with an SLWE than nonpreserved SLWE patients; this effect abated at 1 year as performance among nonpreserved SLWE patients became equivalent to the remaining cohort. Speech outcomes in SME patients were similar regardless of HP status. Age at implantation and datalogging was correlated with speech outcomes., Conclusion: In this cohort of HP patients, a 1-year functional HP rate of 23.9% (SME) and 36.4% (SLWE) was observed (p = 0.168). This was initially 57.1% (SME) and 70.3% (SLWE) at activation, p = .172. Datalogging and age at implantation were correlated with postoperative speech outcomes., (© 2023 American Academy of Otolaryngology-Head and Neck Surgery Foundation.)
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- 2023
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47. Assessment of cochlear synaptopathy by electrocochleography to low frequencies in a preclinical model and human subjects.
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Haggerty RA, Hutson KA, Riggs WJ, Brown KD, Pillsbury HC, Adunka OF, Buchman CA, and Fitzpatrick DC
- Abstract
Cochlear synaptopathy is the loss of synapses between the inner hair cells and the auditory nerve despite survival of sensory hair cells. The findings of extensive cochlear synaptopathy in animals after moderate noise exposures challenged the long-held view that hair cells are the cochlear elements most sensitive to insults that lead to hearing loss. However, cochlear synaptopathy has been difficult to identify in humans. We applied novel algorithms to determine hair cell and neural contributions to electrocochleographic (ECochG) recordings from the round window of animal and human subjects. Gerbils with normal hearing provided training and test sets for a deep learning algorithm to detect the presence of neural responses to low frequency sounds, and an analytic model was used to quantify the proportion of neural and hair cell contributions to the ECochG response. The capacity to detect cochlear synaptopathy was validated in normal hearing and noise-exposed animals by using neurotoxins to reduce or eliminate the neural contributions. When the analytical methods were applied to human surgical subjects with access to the round window, the neural contribution resembled the partial cochlear synaptopathy present after neurotoxin application in animals. This result demonstrates the presence of viable hair cells not connected to auditory nerve fibers in human subjects with substantial hearing loss and indicates that efforts to regenerate nerve fibers may find a ready cochlear substrate for innervation and resumption of function., Competing Interests: DF, OA, CB, HP, and KB have consulting arrangements and research projects with MED-EL, Cochlear Corp, and/or Advanced Bionics. CB also consults for Envoy Medical and IotaMotion. OA and CB have an equity interest in Advanced Cochlear Diagnostics. The remaining authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest., (Copyright © 2023 Haggerty, Hutson, Riggs, Brown, Pillsbury, Adunka, Buchman and Fitzpatrick.)
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- 2023
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48. Responsible Imputation of Missing Speech Perception Testing Data & Analysis of 4,739 Observations and Predictors of Performance.
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Pavelchek C, Lee DS, Walia A, Michelson AP, Ortmann A, Gentile B, Herzog JA, Buchman CA, and Shew MA
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- Data Analysis, Retrospective Studies, Treatment Outcome, Humans, Adult, Cochlear Implantation, Cochlear Implants, Speech Perception
- Abstract
Objective: To address outcome heterogeneity in cochlear implant (CI) research, we built imputation models using multiple imputation by chained equations (MICEs) and K-nearest neighbors (KNNs) to convert between four common open-set testing scenarios: Consonant-Nucleus-Consonant word (CNCw), Arizona Biomedical (AzBio) in quiet, AzBio +5, and AzBio +10. We then analyzed raw and imputed data sets to evaluate factors affecting CI outcome variability., Study Design: Retrospective cohort study of a national CI database (HERMES) and a nonoverlapping single-institution CI database., Setting: Multi-institutional (32 CI centers)., Patients: Adult CI recipients (n = 4,046 patients)., Main Outcome Measures: Mean absolute error (MAE) between imputed and observed speech perception scores., Results: Imputation models of preoperative speech perception measures demonstrate a MAE of less than 10% for feature triplets of CNCw/AzBio in quiet/AzBio +10 (MICE: MAE, 9.52%; 95% confidence interval [CI], 9.40-9.64; KNN: MAE, 8.93%; 95% CI, 8.83-9.03) and AzBio in quiet/AzBio +5/AzBio +10 (MICE: MAE, 8.85%; 95% CI, 8.68-9.02; KNN: MAE, 8.95%; 95% CI, 8.74-9.16) with one feature missing. Postoperative imputation can be safely performed with up to four of six features missing in a set of CNCw and AzBio in quiet at 3, 6, and 12 months postcochlear implantation using MICE (MAE, 9.69%; 95% CI, 9.63-9.76). For multivariable analysis of CI performance prediction, imputation increased sample size by 72%, from 2,756 to 4,739, with marginal change in adjusted R2 (0.13 raw, 0.14 imputed)., Conclusions: Missing data across certain sets of common speech perception tests may be safely imputed, enabling multivariate analysis of one of the largest CI outcomes data sets to date., Competing Interests: Conflicts of Interest: C.P. and D.S.L. do not have conflicts of interest. J.A.H. is a consultant for Cochlear Ltd. C.A.B. is a consultant for Advanced Bionics, Cochlear Ltd., Envoy, and IotaMotion, and has equity interest in Advanced Cochlear Diagnostics, LLC. M.A.S. is a consultant for Cochlear Ltd., (Copyright © 2023, Otology & Neurotology, Inc.)
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- 2023
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49. Place Coding in the Human Cochlea.
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Walia A, Ortmann AJ, Lefler S, Holden TA, Puram SV, Herzog JA, and Buchman CA
- Abstract
The cochlea's capacity to decode sound frequencies is enhanced by a unique structural arrangement along its longitudinal axis, a feature termed 'tonotopy' or place coding. Auditory hair cells at the cochlea's base are activated by high-frequency sounds, while those at the apex respond to lower frequencies. Presently, our understanding of tonotopy primarily hinges on electrophysiological, mechanical, and anatomical studies conducted in animals or human cadavers. However, direct in vivo measurements of tonotopy in humans have been elusive due to the invasive nature of these procedures. This absence of live human data has posed an obstacle in establishing an accurate tonotopic map for patients, potentially limiting advancements in cochlear implant and hearing enhancement technologies. In this study, we conducted acoustically-evoked intracochlear recordings in 50 human subjects using a longitudinal multi-electrode array. These electrophysiological measures, combined with postoperative imaging to accurately locate the electrode contacts allow us to create the first in vivo tonotopic map of the human cochlea. Furthermore, we examined the influences of sound intensity, electrode array presence, and the creation of an artificial third window on the tonotopic map. Our findings reveal a significant disparity between the tonotopic map at daily speech conversational levels and the conventional (i.e., Greenwood) map derived at close-to-threshold levels. Our findings have implications for advancing cochlear implant and hearing augmentation technologies, but also offer novel insights into future investigations into auditory disorders, speech processing, language development, age-related hearing loss, and could potentially inform more effective educational and communication strategies for those with hearing impairments., Significance Statement: The ability to discriminate sound frequencies, or pitch, is vital for communication and facilitated by a unique arrangement of cells along the cochlear spiral (tonotopic place). While earlier studies have provided insight into frequency selectivity based on animal and human cadaver studies, our understanding of the in vivo human cochlea remains limited. Our research offers, for the first time, in vivo electrophysiological evidence from humans, detailing the tonotopic organization of the human cochlea. We demonstrate that the functional arrangement in humans significantly deviates from the conventional Greenwood function, with the operating point of the in vivo tonotopic map showing a basal (or frequency downward) shift. This pivotal finding could have far-reaching implications for the study and treatment of auditory disorders.
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- 2023
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50. Predictors of Short-Term Changes in Quality of Life after Cochlear Implantation.
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Walia A, Bao J, Dwyer N, Rathgeb S, Chen S, Shew MA, Durakovic N, Herzog JA, Buchman CA, and Wick CC
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- Adult, Humans, Quality of Life, Hearing, Treatment Outcome, Cochlear Implantation methods, Cochlear Implants, Hearing Loss, Sensorineural surgery, Speech Perception physiology
- Abstract
Objective: This study aimed 1) to measure the effect of cochlear implantation on health-related quality of life (HR-QOL) using the Cochlear Implant Quality of Life (CIQOL) questionnaire and 2) to determine audiologic, demographic, and non-CI/hearing-related QOL factors influencing the CIQOL., Study Design: Prospective observational study., Setting: Tertiary referral center., Patients and Interventions: Thirty-seven adult patients with sensorineural hearing loss undergoing cochlear implantation., Main Outcome Measures: CIQOL-global score preimplantation and 6 months postimplantation. Physical function score as measured by the short-form survey, audiologic, and demographic variables., Results: CIQOL showed significant improvement from preimplantation to 6 months postactivation with a mean difference of 14.9 points (95% confidence interval, 11.3 to 18.5, p < 0.0001). Improvement in CIQOL (ΔCIQOL) correlated linearly with age ( r = -0.49, p = 0.001) and improvement in speech perception testing ( r = 0.63, p < 0.0001). Multivariate modeling using age and change in consonant-vowel nucleus-consonant (CNC) score explained 46% of the variability measured by the ΔCIQOL-global score., Conclusions: Nearly all CI recipients achieve significant gains for all domains as measured by the CIQOL. However, younger patients and those with a greater improvement in speech perception performance (CNC) are more likely to achieve a greater CIQOL benefit. Results here suggest the importance of considering preoperative CIQOL and speech perception measures when evaluating predictors of HR-QOL., Competing Interests: Conflicts of Interest and Source of Funding: AW is supported by NIH/NIDCD institutional training grant no. T32DC000022; JB is supported by NIH/NIDCD institutional training grant no. T32DC000022; ND, SR, SC, MAS, and ND disclose no conflicts of interest; JAH is a consultant for Cochlear Ltd.; CAB is a consultant for Advanced Bionics, Cochlear Ltd., Envoy, and IotaMotion, and has equity interest in Advanced Cochlear Diagnostics, LLC; CCW is a consultant for Stryker and Cochlear Ltd., (Copyright © 2023, Otology & Neurotology, Inc.)
- Published
- 2023
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