performing-repeated-intraoperative-impedance-telemetry-measurements

Performing Repeated Intraoperative Impedance Telemetry Measurements during Cochlear Implantation

Impedance measurements are routinely performed during cochlear implantation (CI) after finalized electrode insertion. They may allow conclusions on the ...

Ruhr-University Bochum, St. Elisabeth-Hospital Bochum

The study was performed to identify the incidence and histology of rare tumors with growth restricted to the internal auditory canal (IAC) that are different from vestibular schwannoma (VS). Furthermore, the question was addressed whether a preoperative diagnosis would be possible in these cases. A series of 351 patients that were operated on for IAC tumors through a transtemporal or translabyrinthine approach was investigated retrospectively. Cases with a tumor entity other than VS were analyzed for symptoms, radiological diagnosis, intraoperative findings and postoperative histolopatology to determine if a differential diagnosis to the common VS can be established prior to surgery. In 15 out of 351 cases (4.3%), uncommon processes of the IAC were determined by histology (6 lipomas, 3 hemangiomas, 2 neurofibromas, 2 menigiomas, 1 facial neuroma and 1 case of bilateral malignant lymphoma). The symptoms and the clinical manifestations were typical for patients with VS so that a preoperative differential diagnosis was not possible in the majority of cases. An analysis of the operation reports revealed that in 10 out of the 15 cases the surgeon suspected an unusual tumor of the IAC during surgery. The results of the present investigation suggest that rare lesions of the IAC can be expected in less than 5% of the cases and that preoperative diagnosis of rare IAC tumors is difficult. Intraoperative findings such as adhesion to cranial nerves and consistency of the tumor often indicate unusual processes, but histological analysis of the removed tissue is essential for the definite diagnosis.

Rare tumors of the internal auditory canal.

After the horrifying genocide in Rwanda in 1994, medical care of the small country almost broke down completely. During the following years, different medical fields had to be redeveloped. However, until 2009, there was no training program for otorhinolaryngology offered in Rwanda. Together with the University of Rwanda, we established a Master of Medicine Program that started in 2010. With the support of German otorhinolaryngologists, 10 ENT specialists have completed their training to date and 15 colleagues are currently still undergoing education in the program.

[Helping people to help themselves : 10 years of successful graduate medical training in otorhinolaryngology in Rwanda (Africa)].

The optimal pain therapy for children undergoing tonsillotomy remains unknown. Our aim was to evaluate a standard pain therapy including the alternating application of ibuprofen and paracetamol.

Pain in children undergoing tonsillotomy with alternating ibuprofen and paracetamol - a prospective observational study.

[NUT-Midline-Carcinoma in patients of advanced age - a rare differential diagnosis].

A "gold standard" for quantitatively diagnosing inner ear malformations (IEMs) and a consensus on normative measurements are lacking. Reference ranges and cutoff values of inner ear dimensions may add in distinguishing IEM types. This study evaluates the volumes of the cochlea and vestibular system in different types of IEM.

Cochlear and Vestibular Volumes in Inner Ear Malformations.

A narrow bony internal auditory canal (IAC) may be associated with a hypoplastic cochlear nerve and poorer hearing performances after cochlear implantation. However, definitions for a narrow IAC vary widely and commonly, qualitative grading or two-dimensional measures are used to characterize a narrow IAC. We aimed to refine the definition of a narrow IAC by determining IAC volume in both control patients and patients with inner ear malformations (IEMs).

Internal auditory canal volume in normal and malformed inner ears.

Menière's Syndrome Associated With Fibrous Dysplasia of the Temporal Bone.

In cochlear implantation with flexible lateral wall electrode arrays, a cochlear coverage (CC) range between 70% and 80% is considered ideal for optimal speech perception. To achieve this CC, the cochlear implant (CI) electrode array has to be chosen according to the individual cochlear duct length (CDL). Here, we mathematically analyzed the suitability of different flexible lateral wall electrode array lengths covering between 70% and 80% of the CDL.

Stefan Dazert

Department of Otorhinolaryngology-Head and Neck Surgery

Ruhr-University Bochum, St. Elisabeth-Hospital Bochum

Performing Repeated Intraoperative Impedance Telemetry Measurements during Cochlear Implantation

Stefan Dazert

.css-o250i3{font-size:18px;font-family:Open Sans,sans-serif;line-height:21.6px;}Department of Otorhinolaryngology-Head and Neck Surgery

Ruhr-University Bochum, St. Elisabeth-Hospital Bochum

Performing Repeated Intraoperative Impedance Telemetry Measurements during Cochlear Implantation

Department of Otorhinolaryngology-Head and Neck Surgery