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- W1982482661 abstract "We recorded intraoperative and postoperative electrically evoked compound action potentials (ECAPs) in rhesus monkeys implanted with a vestibular neurostimulator. The objectives were to correlate the generation of slow-phase nystagmus or eye twitches induced by electrical stimulation of the implanted semicircular canal with the presence or absence of the vestibular ECAP responses and to assess the effectiveness of ECAP monitoring during surgery to guide surgical insertion of electrode arrays into the canals.Four rhesus monkeys (a total of 7 canals) were implanted with a vestibular neurostimulator modified from the Nucleus Freedom cochlear implant. ECAP recordings were obtained during surgery or at various intervals after surgery using the Neural Response Telemetry feature of the clinical Custom Sound EP software. Eye movements during electrical stimulation of individual canals were recorded with a scleral search coil system in the same animals.Measurable vestibular ECAPs were observed intraoperatively or postoperatively in 3 implanted animals. Robust and sustained ECAPs were obtained in 3 monkeys at the test intervals of 0, 7, or greater than 100 days after implantation surgery. In all 3 animals, stimulation with electrical pulse trains produced measurable eye movements in a direction consistent with the vestibulo-ocular reflex from the implanted semicircular canal. In contrast, electrically evoked eye movements could not be measured in 3 of the 7 implanted canals, none of which produced distinct vestibular ECAPs. In 2 animals, ECAP waveforms were systematically monitored during surgery, and the procedure proved crucial to the success of vestibular implantation.Vestibular ECAPs exhibit similar morphology and growth characteristics to cochlear ECAPs from human cochlear implant patients. The ECAP measure is well correlated with the functional activation of eye movements by electrical stimulation after implantation surgery. The intraoperative ECAP recording technique is an efficient tool to guide the placement of electrode array into the semicircular canals." @default.
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- W1982482661 date "2011-01-01" @default.
- W1982482661 modified "2023-09-28" @default.
- W1982482661 title "Characterization of the Electrically Evoked Compound Action Potential of the Vestibular Nerve" @default.
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- W1982482661 doi "https://doi.org/10.1097/mao.0b013e3181f6ca45" @default.
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