Grundlagen, Methodik und modulares Geraetesystem fuer die objektive Hoerbahndiagnostik, insbesondere bei Kleinkindern Abschlussbericht

The electric stimulability of the auditory nerve is a basic requirement of function of a cochlear implant (CI). Nevertheless most CI teams dispense with any proof of this stimulability in young children before the implantation operation. Some failures are to be explained by this fact. A cooperation-free test based on electrically evoked auditory potentials is needed being applicable within the preliminary examinations. With this aim theoretical considerations were made and experimental investigations were carried out and resulted in the following findings: 1) In young children electrically evoked amplitude modulation following responses (E-AMFR) may be obtained with stimulation within the outer ear canal (all examinations were carried out in general anaesthesia). 2) In older children and adults promontory stimulation after local anaesthesia is indicated. 3) In more than 70% of all cases also brainstem auditory evoked potentials (E-BAEP) may be obtained by capacitor-discharge stimulation (stimulation site like 1) or 2)). Electrodes suitable for outer ear or promontory stimulation are shown. The technical equipment will be produced by PILOT Blankenfelde GmbH, D-15827 Blankenfelde. (orig.)Available from TIB Hannover: F98B1465 / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEBundesministerium fuer Bildung, Wissenschaft, Forschung und Technologie, Bonn (Germany)DEGerman