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Performing Repeated Intraoperative Impedance Telemetry Measurements during Cochlear Implantation

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A method for removing cochlear implant artifact.

Lendra M Friesen¹, Terence W Picton

¹Sunnybrook Health Sciences Centre, Toronto, Ontario, Canada. lendra.friesen@sunnybrook.ca

Hearing Research

|November 3, 2009

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A novel subtraction technique effectively removes electrical artifact from cortical auditory evoked potentials (CAEPs) in cochlear implant (CI) users. This method isolates the physiological response, improving audiological assessments for CI recipients.

Area of Science:

Neuroscience
Audiology
Biomedical Engineering

Background:

Cortical auditory evoked potentials (CAEPs) are crucial for assessing auditory function.
Electrical artifact from cochlear implants (CIs) significantly hinders CAEP measurement.
Existing methods struggle to isolate neural responses from CI-generated artifact.

Purpose of the Study:

To develop and validate a subtraction technique for removing electrical artifact from CI-generated CAEPs.
To assess the efficacy of varying interstimulus intervals (ISIs) in artifact reduction.
To confirm the feasibility of artifact-free N1-P2 response measurement in CI users.

Main Methods:

Recorded N1-P2 responses using speech syllables, tones, and pulse trains.
Employed varying interstimulus intervals (ISIs) including random and fixed durations (0.5-4s).

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Utilized a subtraction method comparing CAEPs from short and long ISIs in cochlear implant listeners.

Main Results:

N1-P2 response amplitudes generally increased with longer ISIs.
Difference waveforms were largest in homogeneous and random-stimulus blocks compared to random-ISI blocks.
The subtraction technique effectively eliminated electrical artifact in cochlear implant users.

Conclusions:

The proposed subtraction technique is a feasible and effective method for removing electrical artifact from CAEPs in CI users.
This technique enables clearer measurement of the N1-P2 response, enhancing audiological evaluation.
Further research can refine ISI parameters for optimal artifact removal and physiological response isolation.