13 results on '"Hagen, Rudolf"'
Search Results
2. Two-phase survey on the frequency of use and safety of MRI for hearing implant recipients
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van de Heyning, Paul, Mertens, Griet, Topsakal, Vedat, de Brito, Ruben, Wimmer, Wilhelm, Caversaccio, Marco D., Dazert, Stefan, Volkenstein, Stefan, Zernotti, Mario, Parnes, Lorne S., Staecker, Hinrich, Bruce, Iain A., Rajan, Gunesh, Atlas, Marcus, Friedland, Peter, Skarzynski, Piotr H., Sugarova, Serafima, Kuzovkov, Vladislav, Hagr, Abdulrahman, Mlynski, Robert, Schmutzhard, Joachim, Usami, Shin-Ichi, Lassaletta, Luis, Gavilán, Javier, Godey, Benoit, Raine, Christopher H., Hagen, Rudolf, Sprinzl, Georg M., Brown, Kevin, Baumgartner, Wolf-Dieter, and Karltorp, Eva
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- 2021
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3. The impact of cochlear implant microphone settings on the binaural hearing of experienced cochlear implant users with single-sided deafness
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Kurz, Anja, Zanzinger, Maren, Hagen, Rudolf, and Rak, Kristen
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- 2021
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4. Flat-based fitting: the evaluation and usefulness of a new strategy-based fitting approach for cochlear implants
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Kurz, Anja, Hagen, Rudolf, van de Heyning, Paul, and Mertens, Griet
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- 2019
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5. Using Anatomy-Based Fitting to Reduce Frequency-to-Place Mismatch in Experienced Bilateral Cochlear Implant Users: A Promising Concept.
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Kurz, Anja, Herrmann, David, Hagen, Rudolf, and Rak, Kristen
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COCHLEAR implants ,SPEECH perception ,SPEECH ,COCHLEA - Abstract
Fitting cochlear implant (CI) users can be challenging. Anatomy-based fitting (ABF) maps may have the potential to lead to better objective and subjective outcomes than conventional clinically based fitting (CBF) methods. ABF maps were created via information derived from exact electrode contact positions, which were determined via post-operative high-resolution flat panel volume computer tomography and clinical fitting software. The outcome measures were speech understanding in quiet and noise and self-perceived sound quality with the CBF map and with the ABF map. Participants were 10 experienced bilateral CI users. The ABF map provided better speech understanding in quiet and noisy environments compared to the CBF map. Additionally, two approaches of reducing the frequency-to-place mismatch revealed that participants are more likely to accept the ABF map if their electrode array is inserted deep enough to stimulate the apical region of their cochlea. This suggests an Angular Insertion Depth of the most apical contact of around 720°–620°. Participants had better speech understanding in quiet and noise with the ABF map. The maps' self-perceived sound quality was similar. ABF mapping may be an effective tool for compensating the frequency-to-place mismatch in experienced bilateral CI users. [ABSTRACT FROM AUTHOR]
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- 2023
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6. The impact of cochlear implant microphone settings on the binaural hearing of experienced cochlear implant users with single-sided deafness
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Kurz, Anja, Zanzinger, Maren, Hagen, Rudolf, and Rak, Kristen
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Single-sided deafness ,03 medical and health sciences ,0302 clinical medicine ,Otorhinolaryngology ,Questionnaire ,otorhinolaryngologic diseases ,ddc:610 ,General Medicine ,Cochlear implant ,030223 otorhinolaryngology ,Adaptive directional microphone setting ,030217 neurology & neurosurgery ,Miscellaneous - Abstract
Objective Cochlear implantation has become a well-accepted treatment option for people with single-sided deafness (SSD) and has become a clinical standard in many countries. A cochlear implant (CI) is the only device which restores binaural hearing. The effect of microphone directionality (MD) settings has been investigated in other CI indication groups, but its impact on speech perception in noise has not been established in CI users with SSD. The focus of this investigation was, therefore, to assess binaural hearing effects using different MD settings in CI users with SSD. Methods Twenty-nine experienced CI users with SSD were recruited to determine speech reception thresholds with varying target and noise sources to define binaural effects (head shadow, squelch, summation, and spatial release from masking), sound localization, and sound quality using the SSQ12 and HISQUI19 questionnaires. Outcome measures included the MD settings “natural”, “adaptive”, and “omnidirectional”. Results The 29 participants involved in the study were divided into two groups: 11 SONNET users and 18 OPUS 2/RONDO users. In both groups, a significant head shadow effect of 7.4–9.2 dB was achieved with the CI. The MD setting “adaptive” provided a significant head shadow effect of 9.2 dB, a squelch effect of 0.9 dB, and spatial release from masking of 7.6 dB in the SONNET group. No significant summation effect could be determined in either group with CI. Outcomes with the omnidirectional setting were not significantly different between groups. For both groups, localization improved significantly when the CI was activated and was best when the omnidirectional setting was used. The groups’ sound quality scores did not significantly differ. Conclusions Adaptive directional microphone settings improve speech perception and binaural hearing abilities in CI users with SSD. Binaural effect measures are valuable to quantify the benefit of CI use, especially in this indication group.
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- 2020
7. Microphone directionality and wind noise reduction enhance speech perception in users of the MED-EL SONNET audio processor.
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Hagen, Rudolf, Radeloff, Andreas, Stark, Thomas, Anderson, Ilona, Nopp, Peter, Aschbacher, Ernst, Möltner, Alexander, Khajehnouri, Yassaman, and Rak, Kristen
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SPEECH perception , *NOISE control , *SONNET , *NOISE , *COCHLEAR implants - Abstract
Objectives: Speech understanding in noise remains a challenge for many cochlear implant users. To improve this, the SONNET audio processor features three microphone directionality (MD) settings and three wind noise reduction (WNR) settings. The primary aim of this study was to assess if speech understanding in noise and hearing in real life was superior with the SONNET or with the OPUS 2, which does not feature MD or WNR.Methods: 31 of 33 participants completed the study. Speech understanding was assessed in two types of acoustic noise, in wind noise, and in quiet. A 4-speaker setup was used and speech was presented from 0° and noise from 90°, 180°, and 270°. Wind noise was simulated with a fan. Sound quality and hearing-related abilities were assessed via two subjective questionnaires.Results: Speech understanding in acoustic noise with the SONNET was significantly better or equal to than with the OPUS 2. Speech understanding in wind with the OPUS 2 was significantly better than with the SONNET in some settings. Sound quality and hearing-related abilities were both significantly better with the SONNET.Conclusions: The SONNET provides the same or significantly improved speech understanding than the OPUS 2 in quiet and in noise. While OPUS 2 was superior in wind than the SONNET in some settings, this was offset by SONNET's superiority in real-life listening situations. We therefore conclude that the front-end processing of the SONNET provides users with better hearing than does the OPUS 2. [ABSTRACT FROM AUTHOR]
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- 2020
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8. Remote programming of cochlear implants in users of all ages.
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Schepers, Kelly, Steinhoff, Hans-Jochen, Ebenhoch, Harald, Böck, Katja, Bauer, Karin, Rupprecht, Lisa, Möltner, Alexander, Morettini, Stefano, and Hagen, Rudolf
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AGE distribution ,AUDIOMETRY ,AUDITORY perception ,BIOTELEMETRY ,COCHLEAR implants ,PROSTHETICS ,SPEECH perception ,TELECOMMUNICATION ,TREATMENT effectiveness ,TREATMENT duration - Abstract
Copyright of Acta Oto-Laryngologica is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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- 2019
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9. A polydopamine peptide coating enables adipose‐derived stem cell growth on the silicone surface of cochlear implant electrode arrays.
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Schendzielorz, Philipp, Rak, Kristen, Radeloff, Katrin, Völker, Johannes, Gehrke, Thomas, Scherzad, Agmal, Kleinsasser, Norbert, Hagen, Rudolf, and Radeloff, Andreas
- Abstract
Abstract: The simultaneous application of neurotrophic factors with cochlear implantation is proposed to enhance the bioelectrical interface between electrodes and auditory neurons, and thus improve speech intelligibility in patients with cochlear implants (CIs). In cell‐based approaches, the goal is to colonize CIs with cells producing neurotrophic factors. This study aims to evaluate whether a polydopamine (PD) functionalization of the hydrophobic silicone surface of the electrode carrier enables colonization of adipose‐derived stem cells known to deliver neurotrophic factors. Surface characteristics of PD‐coated silicone samples and electrode carriers were determined, and the proliferation and viability of adipose‐derived stem cells (ASCs) on these surfaces were subsequently analyzed. A homogenous PD coating and cell growth with regular morphology was observed on coated silicone samples and electrode arrays. Hydrophilicity and cell viability was significantly enhanced by PD surface modification. Insertion forces of coated electrode arrays did not increase compared with untreated CIs. Hence, PD coating of the silicone surface of CIs might allow for sufficient colonization with ASCs as a continuous source of neurotrophic factors. © 2017 Wiley Periodicals, Inc. J Biomater Res Part A: 106B: 1431–1438, 2018. [ABSTRACT FROM AUTHOR]
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- 2018
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10. Clinical Trial Results with the MED-EL Fine Structure Processing Coding Strategy in Experienced Cochlear Implant Users.
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Müller, Joachim, Brill, Stefan, Hagen, Rudolf, Moeltner, Alexander, Brockmeier, Steffi-Johanna, Stark, Thomas, Helbig, Silke, Maurer, Jan, Zahnert, Thomas, Zierhofer, Clemens, Nopp, Peter, and Anderson, Ilona
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COCHLEAR implants ,SPEECH perception ,ABSOLUTE pitch ,INTONATION (Phonetics) ,ARTIFICIAL implants - Abstract
Objectives: To assess the subjective and objective performance of the new fine structure processing strategy (FSP) compared to the previous generation coding strategies CIS+ and HDCIS. Methods: Forty-six adults with a minimum of 6 months of cochlear implant experience were included. CIS+, HDCIS and FSP were compared in speech perception tests in noise, pitch scaling and questionnaires. The randomized tests were performed acutely (interval 1) and again after 3 months of FSP experience (interval 3). The subjective evaluation included questionnaire 1 at intervals 1 and 3, and questionnaire 2 at interval 2, 1 month after interval 1. Results: Comparison between FSP and CIS+ showed that FSP performed at least as well as CIS+ in all speech perception tests, and outperformed CIS+ in vowel and monosyllabic word discrimination. Comparison between FSP and HDCIS showed that both performed equally well in all speech perception tests. Pitch scaling showed that FSP performed at least as well as HDCIS. With FSP, sound quality was at least as good and often better than with HDCIS. Conclusions: Results indicate that FSP performs better than CIS+ in vowel and monosyllabic word understanding. Subjective evaluation demonstrates strong user preferences for FSP when listening to speech and music. Copyright © 2012 S. Karger AG, Basel [ABSTRACT FROM AUTHOR]
- Published
- 2012
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11. A coated electrode carrier for cochlear implantation reduces insertion forces.
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Radeloff, Andreas, Unkelbach, Marc H., Mack, Martin G., Settevendemie, Claudia, Helbig, Silke, Mueller, Joachim, Hagen, Rudolf, and Mlynski, Robert
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Objectives/Hypothesis: To assess the insertion forces and feasibility of insertion of a prototype electrode carrier coated with a flexible and biodegradable coating developed for lubrication and drug delivery. Study Design: Experimental study. Methods: Eight coated and eight uncoated electrode carriers were inserted into a scala tympani model by means of an insertion device, and forces produced during insertion were determined in near real time. The maximum insertion depths and insertion angle were determined. To test the handling and operability, five coated electrode carriers were implanted into human temporal bones. Additionally, the bones were processed undecalcified and the distribution of the coating material within the cochlea evaluated. Results: Insertion forces were markedly reduced in the group of coated electrode carriers for insertion depths above 15 mm. The insertions were less fitful and led to a higher maximum insertion angle. The insertion of the coated electrode carrier was feasible, and the coating material was evident up to the apical parts of the cochlea postimplantation. Conclusions: Coating of a cochlear implant electrode carrier may reduce insertion forces responsible for the surgical trauma. Loaded with active substances, the coating may help to deliver drugs to the apical parts of the cochlear where hair cells reside in patients with residual hearing. Laryngoscope, 2009 [ABSTRACT FROM AUTHOR]
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- 2009
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12. Development of an Algorithm for Correct Placement of the Basal Electrode Contact in the Context of Anatomy-Based Cochlear Implantation: A Proof of Concept.
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Spahn, Bjoern, Voelker, Johannes, Müller-Graff, Franz-Tassilo, Engert, Jonas, Bauer, Daniel, Kurz, Anja, Hagen, Rudolf, Neun, Tilmann, Zabler, Simon, and Rak, Kristen
- Abstract
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Correct individual tonotopic frequency stimulation of the cochlea plays an important role in the further development of anatomy-based cochlear implantation. In this context, frequency-specific fitting of the basal electrode contact with a normal insertion depth can be difficult since it is often placed in a frequency range higher than 10 kHz, and current audio processors only stimulate for frequencies up to 8.5 kHz due to microphone characteristics. This results in a mismatch of the high frequencies. Therefore, this study represents a proof of concept for a tonotopic correct insertion and aims to develop an algorithm for a placement of the basal electrode below 8.5 kHz in an experimental setting.Background: Pre- and postoperative flat-panel volume CT scans with secondary reconstructions were performed on 10 human temporal bone specimens. The desired frequency location for the most basal electrode contact was set at 8.25 kHz. The distance from the round window to the position where the basal electrode contact was intended to be located was calculated preoperatively using 3D-curved multiplanar reconstruction and a newly developed mathematical approach. A specially designed cochlear implant electrode array with customized markers imprinted on the silicone of the electrode array was inserted in all specimens based on the individually calculated insertion depths. All postoperative measurements were additionally validated using otological planning software.Methods: Positioning of the basal electrode contact was reached with only a small mean deviation of 37 ± 399 Hz and 0.06 ± 0.37 mm from the planned frequency of 8.25 kHz. The mean rotation angle up to the basal electrode contact was 51 ± 5°. In addition, the inserted electrode array adequately covered the apical regions of the cochleae.Results: Using this algorithm, it was possible to position the basal electrode array contact in an area of the cochlea that could be correctly stimulated by the existing speech processors in the context of tonotopic correct fitting. Tonotopic-matched stimulation of the cochlea is important in the context of anatomy-based cochlear implantation. The basal cochlear implant electrode contact is often placed in a frequency range higher than 10 kHz – when a normal insertion depth is reached – and can therefore be difficult to fit since current audio processors only stimulate for frequencies up to 8.5 kHz. This leads to a mismatch of high frequencies. This study represents a proof of concept for a tonotopic correct insertion and aims to develop an algorithm for a placement of the basal electrode below 8.5 kHz in an experimental setting. Therefore, pre- and postoperative CT scans were performed on 10 human temporal bone specimens. Tonotopic information about the aimed position of basal electrode contact was extracted from the imaging dataset by using 3D-curved multiplanar reconstruction and a newly developed mathematical approach. A specially designed cochlear implant electrode array was inserted in all specimens based on the individually calculated insertion depths. Positioning of the basal electrode contact was reached with only a small mean deviation of 37 ± 399 Hz and 0.06 ± 0.37 mm from the planned frequency of 8.25 kHz. In addition, the inserted electrode array adequately covered the apical regions of the cochleae. Using this algorithm, it was possible to position the basal electrode array contact in an area of the cochlea that can be correctly stimulated by the existing speech processors in the context of tonotopic correct fitting. [ABSTRACT FROM AUTHOR]Conclusion: - Published
- 2024
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13. Evaluation and therapy outcome in children with auditory neuropathy spectrum disorder (ANSD).
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Ehrmann-Müller, Désirée, Cebulla, Mario, Rak, Kristen, Scheich, Matthias, Back, Daniela, Hagen, Rudolf, and Shehata-Dieler, Wafaa
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AUDITORY neuropathy , *SPEECH perception , *SPEECH apraxia , *COCHLEAR implants , *CHILDREN'S language , *SIGNAL-to-noise ratio , *VELOPHARYNGEAL insufficiency - Abstract
The aims of the present study are to: describe diagnostic findings in patients with auditory neuropathy spectrum disorder (ANSD); and demonstrate the outcomes of different therapies like hearing aids (HAs) or cochlear implantation. 32 children were diagnosed and treated at our tertiary referral center and provided with HAs or cochlear implants (CIs). All of them underwent free-field or pure-tone audiometry. Additionally, otoacoustic emissions (OAEs), impedance measurements, auditory brainstem responses (ABRs), auditory steady-state responses (ASSR), electrocochleography, and cranial magnetic resonance imaging (cMRI) were all performed. Some patients also underwent genetic evaluation. Following suitable provision pediatric audiological tests, psychological developmental diagnostic and speech and language assessments were carried out at regular intervals in all the children. OAEs could initially be recorded in most of the children; 17 had no ABRs. The other eight children had a poor ABR morphology. Most of the children had typical, long-oscillating cochlear microphonics (CMs) in their ABRs, which was also observed in all of those who underwent electrocochleography. Eight children were provided with a HA and 17 received a CI. The functional gain was between 32 and 65 decibel (dB) with HAs and between 32 and 50 dB with CI. A speech discrimination level between 35 and 100% was achieved during open-set monosyllabic word tests in quiet with HA or CI. With the Hochmair-Schulz-Moser (HSM) sentence test at 65 dB SPL (sound pressure level), 75% of the children with a CI achieved a speech discrimination in noise score of at least 60% at a signal to noise ratio (SNR) of 5, and four scored 80% or higher. Most of the children (72%) were full-time users of their devices. All the children with a CI used it on a regular basis. Only a few case reports are available in the literature regarding the long-term outcomes of ANSD therapy. The present study reveals satisfactory outcomes with respect to hearing and speech discrimination in children with CIs or HAs. The nearly permanent use of the devices reflects a subjective benefit for the children. Provision with a suitable hearing device depends on audiological results, the speech and language development of an individual child, and any accompanying disorders. Repeated audiological evaluations, interdisciplinary diagnostics, and intensive hearing and speech therapy are essential for adequate rehabilitation of this group of children. [ABSTRACT FROM AUTHOR]
- Published
- 2019
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