No abstract

The changes in PTA and WRS among patients with Meniere's disease managed with medical therapy or EMSS were not statistically significant. Although performing EMSS to treat the vertigo of Meniere's disease does not appear to be associated with an increased risk of deteriorating auditory function after treatment, surgery also does not confer an increased likelihood of stabilizing or improving hearing.

Micron is a fully handheld active micromanipulator that helps to improve position accuracy and precision in microsurgery by cancelling hand tremor. This work describes adaptation, tuning, and testing of the Micron system for stapedotomy, a microsurgical procedure performed in the middle ear to restore hearing that requires accurate manipulation in narrow spaces. Two end-effectors, a handle, and a brace (or rest) were designed and prototyped. The control system was adapted for the new hardware. The system was tested ex vivo in stapedotomy procedure comparing manually-performed and Micron-assisted surgical tasks. Tremor amplitude was found to be reduced significantly. Further testing is needed in order to obtain statistically significant results regarding other parameters dealing with regularity of the fenestra shape.

Objectives: The need to intraoperatively confirm correct placement of the active electrode of a cochlear implant may occur in various clinical settings. These include a malformed cochlea, difficulty with insertion, or suboptimal or abnormal electrical responses (impedance or evoked action potentials) obtained during intraoperative testing. Frustration with inconsistent images using portable x-ray machines prompted this study to determine the technique needed to reliably image the electrode within the cochlea. Our objective was to establish a radiology protocol that would be reproducible and reliable across institutions. Methods: Prospective cadaveric imaging study. Access to the round window via the facial recess was established using cadaver heads. Electrodes provided by three cochlear implant manufacturers were inserted into the cochlea. The position of the head, angle of the x-ray tube, and beam settings were varied. A compendium of electrode images was obtained and analyzed by neurotologists and a head and neck radiologist to reach a consensus on an optimal imaging protocol. Results: The optimal position for intraoperative x-ray confirmation of cochlear implant electrode placement is obtained by turning the head 45 degrees toward the contralateral ear. The portable digital x-ray machine and central ray was angled 15 degrees (aiming cephalic) from vertical with exposure settings of 32 mAs at 70 kVp and the digital radiography image receptor was positioned under the mattress of the operating table. Conclusion: A protocol for patient and beam source positioning and exposure using a portable digital x-ray unit can provide reliable imaging for intraoperative confirmation of cochlear implant electrode positioning.