Publications by authors named "Jef Mulder"

Objective: To assess the effect of wait and scan (W&S) and stereotactic radiosurgery (SRS) on health-related quality of life (HRQoL) over time in patients with a stable vestibular schwannoma (VS) and growing VS.

Study Design: Longitudinal, multicenter, observational study.

Setting: Tertiary expert center for VS (Radboudumc Nijmegen) and Gamma-Knife center ETZ Hospital Tilburg.

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Introduction: A chronically discharging modified radical mastoid cavity may require surgical intervention. We aim to explore two techniques.

Objective: To compare outcomes of subtotal petrosectomy (STP) and canal wall reconstruction with bony obliteration technique (CWR-BOT).

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Article Synopsis
  • * Out of 215 tumors analyzed, 68% exhibited growth while 35% shrank, with growth-free survival rates declining over 10 years, indicating varied tumor behavior among patients.
  • * Factors like good hearing and the presence of peritumoral edema at diagnosis were linked to a higher chance of tumor growth, suggesting that careful monitoring may be a viable strategy for asymptomatic patients.
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To evaluate the clinical characteristics of petrous apex cholesterol granulomas (PACG) and assess outcomes after different treatment strategies. A consecutive case series of 34 patients with a PACG. Main outcomes were PACG growth, symptoms, and the outcomes of different treatment strategies: wait-and-scan (WS) and surgical drainage.

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Approximately 20% amongst patients are dissatisfied after total knee arthroplasty (TKA). Bicruciate retaining (BCR) TKA offers superior knee kinematics and proprioception, but many surgeons abandoned its use because of complications and technical difficulties. Recently, two new BCR implant designs were introduced : Vanguard XP (Zimmer Biomet) and Journey XR (Smith&Nephew).

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Background: Previous CT and cadaver studies have suggested that the external obturator footprint might be used as a landmark for stem depth in direct anterior THA. Instructions on where to template this structure with small variability in height have been developed but have not been tested in daily clinical practice.

Questions/purposes: In this study we sought to investigate the (1) usability, (2) accuracy, and (3) reliability of the external obturator footprint as a landmark for stem depth in direct anterior THA.

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Objective: Stereotactic radiosurgery (SRS) is one of the treatment modalities for vestibular schwannomas (VSs). However, tumor progression can still occur after treatment. Currently, it remains unknown how to predict long-term SRS treatment outcome.

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Objectives: Patients with a vestibular schwannoma (VS) experience a reduced quality of life (QoL). The main objective of this study was to determine the strongest predictors reducing physical and mental QoL from the disease-specific Penn Acoustic Neuroma Quality of Life (PANQOL) questionnaire in patients with VS.

Design: Observational study.

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Objectives: To develop a prediction model to predict vestibular schwannoma (VS) growth for patients in a wait and scan (W&S) strategy.

Design: Retrospective cohort study.

Setting: Tertiary hospital (Radboud university medical center, Nijmegen, the Netherlands).

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Objective: To evaluate short- and long-term hearing results of surgery for acquired atresia of the external auditory canal (EAC) in a large patient cohort and to define preoperative audiometric conditions useful for patient counseling.

Study Design: Retrospective cohort study.

Setting: Academic tertiary referral center.

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Objective: The aim of this study was to gain insight into the influence of the pretreatment growth rate on the volumetric tumor response and tumor control rates after Gamma Knife radiosurgery (GKRS) for incidental vestibular schwannoma (VS).

Methods: All patients treated with GKRS at the Gamma Knife Center, ETZ Hospital, who exhibited a confirmed radiological progression of their VS after an initial observation period were included. Pre- and posttreatment MRI scans were volumetrically evaluated, and the volume doubling times (VDTs) prior to treatment were calculated.

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Purpose: The objective of this study was to achieve uniform reporting of complications and failures in cochlear implantation, to analyze complications and failures and to identify risk factors for complications in a series of over 1300 cochlear implantations.

Methods: In a retrospective chart review and observational study, data from all cochlear implantations from 1987 to 2015 were entered in a custom-made database. Complications were classified using the contracted form of the Clavien-Dindo system and risk factors were identified by statistical analysis.

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OBJECTIVE Gamma Knife radiosurgery (GKRS) has become an accepted treatment for vestibular schwannoma, with a high rate of tumor control and good clinical outcome. In a small number of cases, additional treatment is needed. This retrospective study examines the clinical outcome, reproducibility of volumetric response patterns, and tumor control rate after administering a second GKRS to treat vestibular schwannomas.

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The European Academy of Otology and Neurotology (EAONO) has previously published a consensus document on the definitions and classification of cholesteatoma. It was based on the Delphi consensus methodology involving the broad EAONO membership. At the same time, the Japanese Otological Society (JOS) had been working independently on the "Classification and Staging of Cholesteatoma.

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Objective: To evaluate the long-term medical and technical results, implant survival, and complications of the semi-implantable vibrant soundbridge (VSB), otologics middle ear transducer (MET), and the otologics fully implantable ossicular stimulator (FIMOS).

Study Design: Retrospective cohort study.

Patients: Patients with chronic external otitis and either moderate to severe sensorineural or conductive/mixed hearing loss.

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OBJECT The authors of this study sought to assess tumor control and complication rates in a large cohort of patients who underwent Gamma Knife radiosurgery (GKRS) for vestibular schwannoma (VS) and to identify predictors of tumor control. METHODS The records of 420 patients treated with GKRS for VS with a median marginal dose of 11 Gy were retrospectively analyzed. Patients with neurofibromatosis Type 2 or who had undergone treatment for VS previously were excluded.

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Background: With expanding inclusion criteria for cochlear implantation, the number of prelingually deafened persons who are implanted as adults increases. Compared with postlingually deafened adults, this group shows limited improvement in speech recognition. In this study, the changes in health-related quality of life in late-implanted prelingually deafened adults are evaluated and related to speech recognition.

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Objectives: To compare amplification options for patients with mixed hearing loss. Devices tested include percutaneous and transcutaneous bone conductors (BCDs) and middle ear implants with their actuator directly coupled to the cochlea.

Setting: Tertiary academic medical center.

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A patient with neurofibromatosis type 2 (bilateral vestibular schwannomas) was treated with bevacizumab (anti-vascular endothelial growth factor [VEFG] monoclonal antibody). The left-sided tumor showed intense uptake on pretreatment In-bevacizumab scintigraphy, indicating VEGF production in the tumor, and no uptake 4 weeks later, demonstrating effective binding of nonradiolabeled bevacizumab to the VEGF produced in the tumor. The right-sided tumor showed no tracer uptake at any time point.

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Objective: To study long-term subjective benefit of patients with sensorineural hearing loss and chronic external otitis who use active middle ear implants.

Design: Single-subject repeated measures in a preintervention and postintervention design with multiple postintervention measurements (questionnaires).

Setting: Tertiary academic center.

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Purpose Of Review: Recently, new information on the natural course and on the results of radiation therapy of vestibular schwannomas has been published. The aim of this study is to summarize the most recent literature on the contemporary insights on the natural course and the results of the latest strategies of radiotherapy for vestibular schwannomas.

Recent Findings: After diagnosis only about one-third of all vestibular schwannomas will progress.

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Objective: To determine the long-term benefit of the Vibrant Soundbridge (VSB) middle ear implant in patients with severe mixed hearing loss and to compare it with other hearing devices.

Design: A retrospective analysis.

Setting: University-affiliated medical center.

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Objectives: The aim of this study was to formulate a predictive rule for vestibular schwannoma growth during the initial observation period after diagnosis.

Methods: Logistic regression models were fitted, with tumor growth in the first year as the dependent variable and patient characteristics as the independent variables. Backward selection was used to eliminate superfluous predictors.

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Objectives/hypothesis: Gamma knife radiosurgery (GKRS) has become an important treatment modality for vestibular schwannomas. The primary aim of this study was to investigate whether tumor growth at the moment of GKRS has any correlation with the outcome. The secondary aim was to identify clinical predictors of radioresistance in vestibular schwannoma patients treated with GKRS.

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Objectives/hypothesis: A prospective long-term follow-up study was conducted to evaluate the results of gamma knife radiosurgery (GKRS) for vestibular schwannoma (VS) patients. Both axial and volumetric measurements are used to determine tumor size during follow-up.

Study Design: Individual prospective cohort study.

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