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

Foreword by Series Editors Terry Zwolan and Jace Wolfe vii
Preface ix
Acknowledgments x
About the Author xi
PART I. LAYING THE FOUNDATION 1

1 The Basics of a Cochlear Implant 3

Introduction 3
Anatomy of Severe to Profound Hearing Loss 4
Basic Principles of Electrical Stimulation of the Auditory System 7
Basic Parts and Functions of a Cochlear Implant 8
Past and Present Devices 12
Candidacy 27

2 Signal Delivery 31

Channels Versus Electrodes 31
Signal Type 34
Stimulus Timing 36
Electrode Configuration 37
Electrode Design 40
Summary 41

PART II. NONPHYSIOLOGICAL OBJECTIVE MEASURES 43

3 Electrode Impedance 45

Introduction 45
The Basics of Electrode Impedance 45
How Impedance Is Measured Clinically 54
Clinical Uses for Impedance Measures 62
Summary 64

4 Electrical Field Potentials 67

Basic Description 67
Measurement 69
Clinical Uses for Electrical Field Potentials 69
Summary 72

5 Averaged Electrode Voltages 75

Basic Description 75
Measurement 75
Factors Affecting AEV Measures 78
Typical Patterns 78
Atypical Patterns 84
Clinical Uses for AEVs 86
Summary 90

PART III. PHYSIOLOGICAL OBJECTIVE MEASURES 91

6 Electrically Evoked Stapedial Reflexes 93

Introduction to Physiological Objective Measures 93
Basic Description 93
Measurement 94
Clinical Uses for ESRTs 95
Summary 98

7 Electrically Evoked Compound Action Potential 101

Basic Description 101
Measurement 102
Clinical Uses for ECAPs 118
Summary 121

8 Electrically Evoked Auditory Brainstem Response 123

Basic Description 123
Measurement 124
Clinical Uses for EABRs 130
Summary 131

9 Electrically Evoked Auditory Middle Latency Response 133

Basic Description 133
Measurement 135
Clinical Uses for EAMLRs 136
Summary 136

10 Electrically Evoked Auditory Cortical Potentials 139

Introduction 139
Electrically Evoked Auditory Late Response 140
Electrically Evoked Acoustic Change Complex 144
Mismatch Negativity 146
P300 Response 148
Summary 149

References 151
Index 161

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.

Related Titles