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Evaluation of Electrode-modiolus Distance and Cochlear Fibrosis Using Depth Sounding and Spectroscopy Tools
Sponsor: University Hospital, Montpellier
Summary
Cochlear fibrosis development can compromise the success and the outcomes of the cochlear implantation (CI) thus affecting the quality of life of the implanted patient. Correlating the results of the Transimpedance Matrix (TIM) measurements to the implant electrode location determined by the Cone Beam Computer Tomography (CBCT), this study aims to identify a range of TIM profiles within the implanted population, certain profiles suggesting the growth of the fibrosis tissue in cochlea
Official title: Evaluation of Electrode-modiolus Distance and Cochlear Fibrosis Using Depth Sounding and Spectroscopy Tools: Comparison With Postoperative Cone Beam CT
Key Details
Gender
All
Age Range
18 Years - 120 Years
Study Type
OBSERVATIONAL
Enrollment
180
Start Date
2023-01-12
Completion Date
2025-01-12
Last Updated
2024-05-29
Healthy Volunteers
No
Conditions
Interventions
Transimedance Matrix measurements
TIM measurements are based on cochlear implant back-telemetry function. Each electrode contact is stimulated in monopolar mode. Transimpedance is represented by the ratio between the voltage measured at each recording electrode and the current injected at the stimulation contact. The result of the measurements is a matrix of 21x21 transimpedances. Stimulation current cannot be perceived by a patient thus making TIM measurements a non-invasive and painless procedure. The test duration is only 2-3 minutes
Depth sounding and spectroscopy
Depth sounding and spectroscopy are based on the matrixes obtained after TIM imaging. Deep sounding measures the capacitances throughout the electrode array whereas spectroscopy determines the phase of every transimpedance value. These tests take 10 to 15 minutes together. The stimulation intensity used by depth sounding technique can be perceived by a patient. If it is considered as unpleasant, the test will be stopped.
Cone Beam Computer Tomography
CBCT is a routine postoperative assessment after CI, non-invasive and painless for patients.
Locations (1)
University Hospital Montpellier
Montpellier, France