Overview

Clinically-oriented, Objective Measures in Cochlear Implants begins with a clear description of the underlying basic science and signal characteristics of objective measures made with cochlear implants. Divided into three parts, this book covers basic science, non-physiological objective measures, and physiological measures.

There are very few books about evoked potentials and objective measures in cochlear implants, making this a great resource for audiology graduate students or seasoned audiologists with little cochlear implant experience.

Audience

Primary Subject: Audiology / Cochlear Implants
Audience Level: Professional/Textbook - Desk Copy

PART 1: LAYING THE FOUNDATION
Chapter 1: The Basics of a Cochlear Implant
Introduction
Anatomy of Severe-Profound Hearing Loss
The Normal Auditory System
The Impaired Auditory System
Basic Principles of Electrical Stimulation of the Auditory System
Basic Parts and Functions of a Cochlear Implant
External Speech Processor
Internal Device
Past and Present Devices
Advanced Bionics
Clarion 1.0
Clarion 1.2
Clarion CII
HiRes 90K
Cochlear
Nucleus 22
Nucleus CI24M
Nucleus CI24R
Nucleus CI24RE
Nucleus CI512
MED-EL
COMBI 40+
PULSAR CI100
SONATA CI100
MED-EL CONCERT
Candidacy

Chapter 2: Signal Delivery
Channels versus Electrodes
Virtual Channels
Signal Type
Analog Signals
Pulsatile Signals
Stimulus Timing
Sequential Stimulation
Simultaneous Stimulation
Partially Simultaneous Stimulation
Electrode Configuration
Electrode Design
Summary

PART 2: NON-PHYSIOLOGICAL OBJECTIVE MEASURES
Chapter 3: Electrode Impedance
Introduction to Non-Physiological Objective Measures
The Basics of Electrode Impedance
The components of Impedance
Resistance
Reactance
Geometric versus Real Surface Area
Impedance Changes Over Time
Abnormal Impedance
Open Circuits
Short Circuits
Partial Short Circuits
Voltage Compliance
How Impedance is Measured Clinically
Advanced Bionics
Cochlear
MED-EL
Clinical Uses for Impedance Measures
Identifying Prevalence of Electrode Failures
Device Programming
Ensure Voltage Compliance
Monitor Electrode Function Over Time
Intraoperative to Postoperative Changes
Changes Across Postoperative Intervals
Summary

Chapter 4: Electrical Field Potentials
Basic Description
Measurement
Clinical Uses for Electrical Field Potentials
Summary

Chapter 5: Averaged Electrode Voltages
Basic Description
Measurement
Stimulus
Recording
Factors Affecting AEV Measures
Typical Patterns
Common Ground
Bipolar+1
Variable Bipolar Mode
Monopolar
Atypical Patterns
Clinical Uses for AEVs
Summary

PART 3: PHYSIOLOGICAL OBJECTIVE MEASURES
Chapter 6: Electrically Evoked Stapedial Reflex
Introduction to Physiological Objective Measures
Basic Description
Measurement
Clinical Uses for ESRTs
Summary

Chapter 7: Electrically Evoked Compound Action Potential
Basic Description
Measurement
Stimulus
Recording
Artifact Reduction Methods
Alternating Polarity
Forward-Masking Subtraction Method
Artifact Template Subtraction Method
Types of Measurements
Threshold and Growth of Response with Level
Refractory Recovery
Spread of Excitation
Measurement Challenges
What Constitutes a Measurable Response?
Clinical uses for ECAPs
Summary

Chapter 8: Electrically Evoked Auditory Brainstem Response
Basic Description
Measurement
Stimulus
Recording
Types of Measurements
Threshold and Growth of Response with Level
Refractory Recovery
Binaural Interaction Component
Latency
Measurement Challenges
What Constitutes a Measurable Response?
Clinical Uses for EABRs
Summary

Chapter 9: Electrically Evoked Auditory Middle Latency Response
Basic Description
Measurement
Stimulus
Recording
Types of Measurements
Threshold and Growth of Response with Level
Latency
Measurement Challenges
Clinical uses for EAMLRs
Summary

Chapter 10: Electrically Evoked Auditory Cortical Potentials
Introduction
Electrically Evoked Auditory Late Response
Basic Description
Measurement
Stimuli
Recording
Clinical Uses
Electrically Evoked Acoustic Change Complex
Basic Description
Measurement
Clinical Uses
Mismatch Negativity
Basic Description
Measurement
Clinical Uses
P300 Response
Basic Description
Measurement
Clinical Uses
Summary

About The Author

Michelle Hughes, PhD, CCC-A

Dr. Michelle Hughes is the Coordinator of the Cochlear Implant Program and Director of the Cochlear Implant Research Laboratory at Boys Town National Research Hospital in Omaha, Nebraska. She is also an adjunct assistant professor in the Department of Special Education and Communication Disorders at the University of Nebraska-Lincoln. Her NIH-funded research program is aimed at investigating the relationships between physiological and perceptual measures in cochlear implant recipients. She has published numerous peer-reviewed journal articles on evoked potentials in cochlear implants, and has presented her work nationally and internationally.

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