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Bode Plots Construction01:24

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The Bode plot is an essential tool in control system analysis, mapping the frequency response of a system through a magnitude plot and a phase plot, both against a logarithmic frequency axis. To construct a Bode plot, consider the transfer function H(ω):

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Performing Repeated Intraoperative Impedance Telemetry Measurements during Cochlear Implantation
06:54

Performing Repeated Intraoperative Impedance Telemetry Measurements during Cochlear Implantation

Published on: August 4, 2023

How well do cochlear implant intraoperative impedance measures predict postoperative electrode function?

Jenny L Goehring1, Michelle L Hughes, Jacquelyn L Baudhuin

  • 1Boys Town National Research Hospital, 425 North 30th Street, Omaha, NE 68131, USA.

Otology & Neurotology : Official Publication of the American Otological Society, American Neurotology Society [And] European Academy of Otology and Neurotology
|January 9, 2013
PubMed
Summary

Most intraoperative cochlear implant electrode abnormalities, especially open circuits (OCs), resolve by initial activation. Short circuits (SCs) may be underestimated, and surgical factors can influence impedance results.

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Area of Science:

  • Otolaryngology
  • Biomedical Engineering
  • Neurosurgery

Background:

  • Cochlear implant electrode impedance monitoring is crucial for device function.
  • Intraoperative and postoperative impedance abnormalities can impact hearing outcomes.
  • Understanding impedance changes is vital for surgical success and patient management.

Purpose of the Study:

  • To assess the incidence of abnormal cochlear implant electrode impedance intraoperatively and at initial activation.
  • To determine the resolution rate of these abnormalities by initial activation.
  • To identify normal intraoperative impedances that become abnormal postoperatively.

Main Methods:

  • Retrospective review of intraoperative and postoperative cochlear implant electrode impedance data.
  • Analysis of 194 devices implanted in 165 pediatric and adult patients at a tertiary referral center.
  • Examination of impedance data for 3,430 individual electrodes.

Main Results:

  • 12.4% of devices showed at least one abnormality (open circuit [OC] or short circuit [SC]) intraoperatively, decreasing to 8.2% postoperatively.
  • 82% of intraoperative abnormalities resolved by the postoperative interval; 18% persisted.
  • A small percentage (0.17%) of electrodes with normal intraoperative impedance became abnormal postoperatively.

Conclusions:

  • Intraoperative OCs frequently resolve by initial activation, suggesting a low need for backup devices in such cases.
  • The incidence of SCs might be underestimated due to detection limitations.
  • Surgical techniques and complications can contribute to abnormal intraoperative impedance findings.