Tobias Rader

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• Univ.-Prof. Dr.-Ing. et. med. habil.
• Professor at Ludwig-Maximilians-Universität in Munich

Objective: The aim of the study was to measure and compare speech perception in users of electric-acoustic stimulation (EAS) supported by a hearing aid in the unimplanted ear and in bilateral cochlear implant (CI) users under different noise and sound field conditions. Gap listening was assessed by comparing performance in unmodulated and modulate...

In normal hearing, the pitch of an acoustic tone can theoretically be encoded by either the place of stimulation in the cochlea or the corresponding rate of vibration. Thus spectral attributes and temporal fine structure of an acoustic signal are naturally correlated. Cochlear implants (CIs), neural prosthetic devices that restore hearing in the pr...

Background: Hearing performance in cochlear implant (CI) users is variable. An objective measure which can allow a prediction of this performance is desirable. Spread of neural excitation (SoE) curves are an objective measure that can be obtained using the fitting software of cochlear implants and might be able to be used as a predictor. A novel m...

Purpose The purpose of this retrospective study is to compare the results of electrically evoked compound action potential (ECAP) measurements using automatic auditory response telemetry (AutoART) with those obtained by ART in adults. The study also aimed to evaluate the predictive value of intraoperative ART and AutoART ECAPs for speech intelligib...

Introduction Electrically evoked compound action potentials (ECAPs) are used for intra-/postoperative monitoring with intracochlear stimulation of cochlear implants. ECAPs are recorded in MED-EL (Innsbruck, Austria) implants using auditory response telemetry (ART), which has been further developed with automatic threshold determination as AutoART....

Objective: In recent years, there has been a trend toward more individualization in the fitting of cochlear implants (CI). Here, a new individualized approach to frequency band allocation was used. This approach is based on binaural perceptual pitch matching. Patient: The patient had congenital bilateral progressive sensorineural hearing loss due t...

BACKGROUND: Menière's Disease (MD) is a debilitating disorder with episodic and variable ear symptoms. Diagnosis can be challenging and evidence for a psychometric instrument to assess subjective impairment of hearing and the associated burden in daily life is currently lacking. OBJECTIVE: To evaluate a short form of the Speech, Spatial und Qualiti...

Purpose Individualized cochlear implantation (CI) is essential to facilitate optimal hearing results for patients. Influence of cochlear coverage (CC) has been studied, however without consideration of different CI-categories, like single sided deafness (SSD), bimodal, and bilateral separately. Methods Retrospective analysis of preoperative CT sca...

Objective Primary stapes surgery is considered a challenging intervention in ear surgery. Despite an risk of deafness in 0.5–1 percent, this procedure has still a good benefit-risk ratio due to the improvement in hearing and quality of life that is usually achieved. However, revision after prior stapes surgery is considered even more challenging. R...

The potential of virtual reality (VR) in supporting hearing research and audiological care has long been recognized. While allowing the creation of experimental settings that closely resemble real-life scenarios and potentially leading to more ecologically valid results, VR could also support the current need for automated or remote assessment of a...

Zusammenfassung Hintergrund Befundberichte neurootologischer Funktionsdiagnostik im Rahmen der interdisziplinären Schwindelabklärung werden meist als Freitextbefunde („free text reports“, FTR) formuliert. Diese unterliegen häufig einer großen Variabilität, sodass hier Informationsverluste möglich sind. Ziel der vorliegenden Studie war es, die Befu...

Purpose The Oldenburg Sentence Test (OLSA) is a German matrix test designed to determine speech recognition thresholds (SRT). It is widely used for hearing-aids and cochlear implant fitting, but an age-adjusted standard is still lacking. In addition, knowing that the ability to concentrate is an important factor in OLSA performance, we hypothesized...

Background The hearing success of patients with bimodal fitting, utilizing both a cochlear implant (CI) and a hearing aid (HA), varies considerably: While some patients benefit from bimodal CI and HA, others do not. Objectives This retrospective study aimed to investigate speech perception in bimodally fitted patients and compare it with the cochl...

Purpose The focus on treating patients with Menière’s Disease (MD) lies on the reduction of vertigo attacks and the preservation of sensory function. Endolympathic hydrops is considered as an epiphenomenon in MD, which can potentially be altered by endolymphatic sac surgery (ESS). Purpose of the study was to investigate the influences on vertigo co...

Background: Hearing success in bimodally hearing patients with a cochlear implant (CI) and a hearing aid (HA) exhibits different results: while some benefit from bimodal CI and HA, others do not. Objective: The aim of this study was to investigate hearing success in terms of speech perception in bimodally fitted patients in relation to the cochl...

Introduction Preservation of residual hearing remains a great challenge during cochlear implantation. Cochlear implant (CI) electrode array insertion induces changes in the microvasculature as well as nitric oxide (NO)-dependent vessel dysfunction which have been identified as possible mediators of residual hearing loss after cochlear implantation....

Introduction: Primary stapes surgery with stapedotomy or stapedectomy already belongs to the most challenging interventions in ear surgery. In spite of an acute risk of deafness in 0.5-1 percent of all primary interventions, as described in the literature, this procedure has still a good benefit-risk ratio due to the improvement in hearing and qual...

Einleitung: Bereits der Primäreingriff einer Stapesplastik gehört zu den herausforderndsten Eingriffen der Ohrchirurgie. Trotz des vorbeschriebenen akuten Ertaubungsrisiko von bis zu 0,5-1 Prozent bei Primäreingriffen hat diese Operation aufgrund der meist erreichten Verbesserung des Hörens und der Lebensqualität ein gutes Nutzen-Risiko-Verhältnis...

At approximately five years of age, children already demonstrate the ability to use spatial hearing, an essential skill to achieve spatial release from masking, and, consequently, improved speech intelligibility in acoustically challenging situations. However, hearing loss and auditory processing disorders are prevalent in the young population. The...

Background: Hearing is a basic ability that is needed for participation in daily life. Hearing loss often greatly reduces a person's quality of life. Nevertheless, epidemiological data on the prevalence of hearing disorders in Germany are sparse. This study investigated the prevalence of hearing disorders and the actual provision with hearing aids...

Introduction: The aim of the present study was to analyze the influence of different music genres, three modulated noises and a pink noise on the heart rate (HR) and to compare between young healthy adults (YA), elderly healthy adults was (EA) and patients with Parkinson’s disease (PD). Furthermore, a sound condition comparison for each group was c...

Purpose The aim of the study was to develop the German Hearing in Noise Test (HINT) with female speaker by fulfilling the recommendations by International Collegium of Rehabilitative Audiology (ICRA) for using a female speaker to create new multilingual speech tests and to determine norms and to compare these norms with German male speech tests—the...

Purpose The aim of this study was to investigate the speech prosody of postlingually deaf cochlear implant (CI) users compared with control speakers without hearing or speech impairment. Method Speech recordings of 74 CI users (37 males and 37 females) and 72 age-balanced control speakers (36 males and 36 females) are considered. All participants...

Correct execution of hearing tests is essential for audiologic diagnostics and selection of treatment by the ENT physician. Especially in the case of pure-tone and speech audiometry, incorrectly performed audiometric masking can lead to false measurement results. Often, hearing that is too good is feigned by overhearing in the contralateral ear. He...

Purpose Treatment of Menière’s Disease (MD) comprises an array of both non-destructive and destructive treatment options. In patients who are therapy–refractory to non-destructive medical treatment, endolymphatic mastoid shunt surgery (EMSS) is both recommended and debated controversially. The aim of this study was to investigate safety in terms of...

Background For patients with single sided deafness (SSD) or severe asymmetric sensorineural hearing loss (ASHL), cochlear implantation remains the only solution to restore bilateral hearing capacity. Prognostically, the duration of hearing loss in terms of audiological outcome is not yet clear. Therefore, the aim of this study was to retrospectivel...

Objectives In pediatric audiology, objective techniques for hearing threshold estimation in infants and children with profound or severe hearing loss play a key role. Auditory brainstem responses (ABR) and auditory steady-state responses (ASSR) are available for frequency-dependent hearing threshold estimations and both techniques show strong corre...

Objectives: The aims of this study were to develop a German Hearing In Noise Test (HINT) using the same methodology as with previous HINT tests; to develop sentence lists for measuring speech reception thresholds (SRTs); and to determine test-retest reliability and norms for measures obtained under headphones. Design: The following steps were foll...

HNO Nachrichten; ISSN: 2198-6533

The article Hearing preservation in children with electric-acoustic stimulation after cochlear implantation-Outcome after electrode insertion with minimal insertion trauma, written by T. Rader, A. Bohnert, C. Matthias, D. Koutsimpelas, M‑A. Kainz, S. Strieth was originally published electronically.

Objective: To develop a new, German, age-appropriate speech audiometry test for children, by using 26 nouns that are most likely part of the lexicon of 2-year-olds. The test is a picture-pointing task with a four-option non-forced choice method. Materials and methods: In total, 179 children aged 2;11 to 6;9 y were included for standardizing and va...

Purpose Free text reports (FTR) of head and neck ultrasound studies are currently deployed in most departments. Because of a lack of composition and language, these reports vary greatly in terms of quality and reliability. This may impair the learning process during residency. The purpose of the study was to analyze the longitudinal effects of usin...

Nature. This e-offprint is for personal use only and shall not be self-archived in electronic repositories. If you wish to self-archive your article, please use the accepted manuscript version for posting on your own website. You may further deposit the accepted manuscript version in any repository, provided it is only made publicly available 12 mo...

Objective A new German speech audiometry test was developed using 26 nouns that are most likely part of the lexicon of 2‑year-old children. The test was a picture-pointing task using a four-alternative non-forced choice method. Materials and methods In total, 179 children aged 2 years 11 months to 6 years 9 months were included to standardize and...

Objective Fitting cochlear implants, especially the precise determination of electrical hearing thresholds, is a time-consuming and complex task for patients as well as audiologists. Aim of the study was to develop a method that enables cochlear implant (CI) patients to determine their electrical hearing thresholds precisely and independently. Appl...

Purpose Wideband-tympanometry (WBT) could give more informative data about the tympanic condition than the conventional tympanometry. In the actual literature, the clinical profit of wideband-tympanometry in pediatric audiological settings is not well evaluated. The aim of this study was to analyze the additional clinical benefit. Methods 150 chil...

Aktive Hörprothesen mit elektrischer Stimulation (Cochlea-Implantate, CI) oder vibroakustischer Stimulation (aktive Knochenleitungsimplantate, BCI) des Hörnervs sind die Therapie der Wahl, wenn bei einer hochgradigen Hörstörung durch herkömmliche akustische schallverstärkende Hörgeräte kein ausreichendes Sprachverstehen mehr erzielt werden kann. N...

There is currently no standardized method for reporting audiological, surgical and subjective outcome measures in clinical trials with active middle ear implants (AMEIs). It is often difficult to compare studies due to data incompatibility and to perform meta-analyses across different centres is almost impossible. A committee of ENT and audiologica...

Background Cochlear implantation in patients with functional residual low-frequency hearing is performed according to an established hearing-preserving surgical technique in order to cause minimal trauma of inner ear structures. Due to the increasing number of cochlear implants in children, the preservation of residual hearing is becoming increasin...

Background: Cochlear implantation in patients with functional residual low-frequency hearing is performed according to an established hearing-preserving surgical technique in order to cause minimal trauma of inner ear structures. Due to the increasing number of cochlear implants in children, the preservation of residual hearing is becoming increas...

Objective: To determine the therapeutic success and safety of an active transcutaneous bone conduction implant (tBCI) in adult patients with conductive or mixed hearing loss. Study design: Retrospective case review. Setting: Five university hospitals in Frankfurt, Hannover, Dresden, Würzburg, and Vienna. Patients: Data were analyzed from 61...

Objective: A psychoacoustic procedure designed for the precise assessment of perceptional threshold (T-level) in cochlear implant (CI) users is presented. The impact of this procedure on speech perception was investigated. Design: Individual T-level measurements were obtained with the proposed procedure and three different speech processor fitti...

Background: Persistent dizziness symptoms after cochlear implantation have an impact on quality of life. In this study, the effects of bilateral cochlear implants (CI) on quality of life as well as on subjective dizziness complaints are analyzed using questionnaires, some of which have never been applied before in these patient collectives. Objec...

Objective: To measure speech reception thresholds (SRTs) in co-located (S0N0) and diffuse noise conditions (multi-source noise field, MSNF) and to assess the impact of beamforming algorithms in MSNF in cochlear implant (CI) users. Study Design: Non-randomized, open, prospective study. Setting: Tertiary referral cochlear implantation center. Patient...

Objective: To assess auditory localization accuracy and speech reception threshold (SRT) in complex noise conditions in adult patients with acquired single-sided deafness, after intervention with a cochlear implant (CI) in the deaf ear. Study design: Nonrandomized, open, prospective patient series. Setting: Tertiary referral university hospita...

The aim of this study was to examine the functional hearing results regarding speech perception and auditory sound localization in a high-resolution directional hearing setup following implantation with a new bone conduction device (MED-EL Bonebridge, Innsbruck, Austria). In addition, we assessed the patient acceptance of the Bonebridge system usin...

It has been shown that patients with electric acoustic stimulation (EAS) perform better in noisy environments than patients with a cochlear implant (CI). One reason for this could be the preserved access to acoustic low-frequency cues including the fundamental frequency (F0). Therefore, our primary aim was to investigate whether users of EAS experi...

Background: While hearing aids for a contralateral routing of signals (CROS-HA) and bone conduction devices have been the traditional treatment for single-sided deafness (SSD) and asymmetric hearing loss (AHL), in recent years, cochlear implants (CIs) have increasingly become a viable treatment choice, particularly in countries where regulatory ap...

Background. After implantation of cochlear implants with hearing preservation for combined electronic acoustic stimulation (EAS), the residual acoustic hearing ability relays fundamental speech frequency information in the low frequency range. With the help of acoustic simulation of EAS hearing perception the impact of frequency and level fine stru...

Objective: The present study reviewed a cochlear implant (CI) patient population after surgery, which received a free-fitting electrode carrier designed for hearing preservation. The aim was to determine the rate of electrode migration of the CI electrodes and present clinical and surgical implications. Study design: Retrospective patient review...

Objective: This study reviewed outcomes of hearing preservation (HP) surgery in a cochlear implant patient population, with clinical follow-up results up to 11 years after implantation. Study design: Retrospective case review. Setting: Tertiary referral university hospital. Patients: Ninety six patients (103 ears) with partial deafness who u...

In normal hearing, the pitch of an acoustic tone could theoretically be encoded by either the place of stimulation on the cochlea or the corresponding rate of vibration. Thereby, the spectral attributes and temporal fine structure of an acoustic signal are naturally correlated. Cochlear implants (CIs), neural prosthetic devices that restore hearing...

The aim of this study is to simulate speech perception with combined electric-acoustic stimulation (EAS), verify the advantage of combined stimulation in normal-hearing (NH) subjects, and then compare it with cochlear implant (CI) and EAS user results from the authors' previous study. Furthermore, an automatic speech recognition (ASR) system was bu...

Previous studies investigating speech perception in noise have typically been conducted with static masker positions. The aim of this study was to investigate the effect of spatial separation of source and masker (spatial release from masking, SRM) in a moving masker setup and to evaluate the impact of adaptive beamforming in comparison with fixed...

Scientists from Goethe University Frankfurt am Main have developed the so-called STRAP (Steering of Tonotopic Rate Adaptive Pitch) procedure for optimizing the stimulation strategy for cochlea implants. By position-dependent adjustment of the stimulation rate to each individual electrode, a much more precise pitch perception is achieved.

Einleitung: Das Bonebridge-System (Med-El, Innsbruck), welches 2012 seine Markteinführung erlebte, ist ein aktives, teilimplantierbares Knochenleitungshörgerät, das durch eine transkutane Signalübertragung auf das Innenohr (Bone Conduction Implant, BCI) ein Hören auf dem erkrankten oder auf dem intakten kontralateralen Ohr ermöglicht. Ziel war es,...

Hintergrund. Hörerhaltende Cochleaimplantation mit kombinierter elektrisch-akustischer Stimulation (EAS) ist bei nutzbarem tieffrequenten Restgehör die Therapie der Wahl. Das akustische Restgehör wirkt sich dabei positiv auf das Sprachverstehen in schwierigen Störgeräuschsituationen aus. Ziel der Arbeit. Ziel dieser Studie war Messung des Sprachver...

Objective: The present study aimed to determine the extent of hearing preservation retrospectively after atraumatic cochlear implant (CI) surgery using a specialized surgical technique and specially designed flexible electrode to minimize cochlear trauma. Study Design: Retrospective study. Setting: Academic tertiary care center. Patients: A consecu...

Preservation of residual hearing after cochlear implantation allows patients the synergetic use of electric and acoustic stimulation (EAS). The application of specific surgical and therapeutic techniques enables the reduction of inner ear trauma, which leads otherwise to complete hearing loss. Due to simultaneous electric and acoustic stimulation,...

Knochenleitungshörgeräte regen das Innenohr über Körperschall an, der auf unterschiedliche Arten auf den Schädelknochen übertragen werden kann. Die beste Ankopplung erhält man, wenn das Hörsystem fest mit dem Knochen verbunden wird. In der Praxis bedeutete dies bislang, dass die Patienten dauerhaft eine die Haut penetrierende und somit ständig sich...

Electric-acoustic stimulation (EAS) means the stimulation of the hearing nerve with an inner ear hearing prostheses by electrical pulses to compensate high frequency deafness and in parallel using the low frequency residual hearing by a hearing aid at the same ear. In this doctoral dissertation, the “Multi-Source Noise Field” is developed and reali...

To determine the effect of the Meniett low-pressure generator on the subjective symptoms and audiovestibular disease markers of patients with unilateral Menière's disease unresponsive to betahistine treatment. Randomised, placebo-controlled, double-blinded, clinical trial at a tertiary referral centre. After ventilation tube placement, patients wer...

Combined electric-acoustic stimulation (EAS) is a therapeutic option for patients with severe to profound mid- and high-frequency hearing loss while low-frequency hearing is mostly unaffected. The present study investigates bimodal pitch matching in EAS users as a function of the angular placement of electrodes. Results are compared with data obtai...

Case A 26-year-old white male patient had undergone resection of a diverticulum of the hypopharynx and myotomy of the cricopharyngeal muscle elsewhere. A transcervical approach had been chosen owing to the presence of an arteria lusoria and the associated risk of vessel injury. The patient had subsequently had recurrent fistulas through the skin in...

Combined electric-acoustic stimulation (EAS) of the auditory system usually results in better speech understanding than electric stimulation only, assuming low-frequency hearing can be preserved. Treatment options and outcomes for 4 subjects experiencing compromised hearing after EAS surgery are discussed. Each subject underwent revision surgery to...

To analyse the correlation between visual fixation suppression test results and the occurrence of post-operative vertigo in patients receiving a cochlear implant, and to compare this with other possible risk factors. In a prospective study setting, caloric vestibular responses, visual fixation suppression and subjective vertigo symptoms were assess...

To examine the influence of cochlear implantation (CI) on the sacculus function and to analyze a possible correlation with resulting vertigo symptoms. In a prospective study including 25 patients undergoing CI, preoperative and postoperative assessment of vestibular evoked myogenic potentials (VEMP), caloric horizontal semicircular canal (hSCC) res...

An important prerequisite for success with a cochlear implant is the integrity of the acoustic nerve (N. cochlearis). Whether the psychophysical parameters gained before cochlear implantation can predict the speech perception scores obtained after rehabilitation is a frequent topic of discussion. In the present study, auditory nerve function was as...

Acoustic neurinoma affects the acousticofacial nerve and therefore in many cases is a contraindication for cochlear implantation and an indication for brainstem implant. Nevertheless benefit in these patients has been shown after tumour removal and cochlear implantation. The first case of bilateral cochlear implantation in a patient with single-sid...

Objectives The aim of this study was to elucidate the frequency and characteristics of preoperative vertigo symptoms in patients who undergo cochlear implantation (CI), in order to differentiate them from CI-related symptoms. Methods In a prospective observational study, 47 adult CI candidates were asked about vertigo problems on a questionnaire....

The objective of this study was to assess the influence of a cochlear implant (CI) on horizontal semicircular canal (hSCC) function, to test the correlation with symptomatic vertigo and to identify possible risk factors for a postoperative vestibular impairment. In a prospective observational study design, forty-seven adult patients who had undergo...

Is the annoyance of snoring a reliable tool for the measurement of snoring or does it depend more on the sensitivity of the listener? During an automatized hearing experiment, 550 representative snoring sequences, recorded during polysomnography, were randomly presented to ten examiners for the evaluation of their annoyance (0-100). The mean annoya...

To assess the incidence of vestibular disturbance in patients after cochlear implantation, and to evaluate the quality of vertigo symptoms. Prospective, observational study. Cochlear implant centre at a tertiary referral university hospital, Munich, Germany. Forty-seven adult patients undergoing unilateral cochlear implantation between 2003 and 200...

Frequency discrimination and pitch matching of implantees using combined electric and acoustic stimulation in either the same ear (EAS) or the opposite ear (bimodal condition) was assessed by means of adaptive procedures. EAS patients received either the MED-EL standard electrode or the recently introduced FLEX design with reduced diameter. Acousti...

CASE: A 26-year-old white male patient had undergone resection of a diverticulum of the hypopharynx and myotomy of the cricopharyngeal muscle elsewhere. A transcervical approach had been chosen owing to the presence of an arteria lusoria and the associated risk of vessel injury. The patient had subsequently had recurrent fistulas through the skin i...

In this study, the evaluation of audio-visual interaction regarding to the sounds and colours of trains was investigated. Different pictures of trains were modified in their colors and presented on a liquid crystal screen in a sound proof room with the appropriate sound of the train. The subjects judged the loudness of the sound-picture stimuli wit...