Peter Issing

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Minimally invasive surgical procedures have revolutionized surgery of the paranasal sinuses. The endonasal procedure has become standard practice due to a better understanding of pathological physiology. However, malformations, previous operations and bleeding can interfere greatly with intraoperative orientation. Together with microscopy and endoscopy,(More)
BACKGROUND AND OBJECTIVE The exact localization of pathological anatomy is the basis of a successful operation. Malformations, tumors, or previous operations can make intraoperative orientation considerably more difficult. Navigation systems can be useful tools in such cases. METHODS The OTS is an optoelectrical navigation system which was used on 34(More)
OBJECTIVE Implantable hearing aids present a new treatment modality for patients suffering from sensorineural hearing loss. The functional gain obtained with the partially implantable Symphonix soundbridge system was evaluated in a clinical study. The audiological results achieved with n = 34 patients over a period of up to three years are presented in this(More)
OBJECTIVE To investigate the effect of chronic electrical stimulation in acoustically deprivated animals during maturation. MATERIALS AND METHODS Latencies of EABR measurements from acoustically deprivated and acoustically deprivated, but electrically stimulated animals were compared with ABR from normal hearing cats. In addition, morphological analyses(More)
OBJECTIVE The concept and design of new cochlear implant electrodes is a challenging process. To evaluate new electrode designs, we present a study that uses a microgrinding procedure to evaluate damage to the microstructures of the cochlea resulting from the insertion procedure. In this study, we compared different insertion techniques with the Contour(More)
Normally, active chronic suppurative otitis media is regarded as a contraindication for cochlear implantation. In case of a radical cavity after surgical treatment for cholesteatoma, the electrode covered by the epithelial lining of the mastoid will likely become exposed or extruded. Under these circumstances we suggest the subtotal petrosectomy,(More)
BACKGROUND Otogenic complications are rare but typical following acute or chronic ear infections like mastoiditis and cholesteatoma. A life-threatening sequela is the otogenic brain abscess located in the temporal lobe or cerebellum. PATIENTS At the ENT Department of the Medical University of Hannover/Germany we treated 8 patients suffering from otogenic(More)
Hintergrund und Fragestellung. Die exakte Lokalisation der Pathoanatomie ist die Grundlage eines erfolgreichen chirurgischen Eingriffs. Malformationen, Tumoren oder vorangegangene Operationen können die intraoperative Orientierung erheblich erschweren. Ein Hilfsmittel stellen Navigationssysteme dar. Methodik. Das OTS ist ein optoelektrisches(More)
Hemangioma of the facial nerve is a rare cause for sensorineural hearing loss. Such was found in a 50-year-old patient with a history of slowly progressive, unilateral deafness. Pure-tone audiogram showed only residual hearing in the left ear. A stapedial reflex could not be elicited, nor could brainstem evoked potentials be recorded. Cranial CT showed a(More)