What do you expect to see in ECochG testing using rarefaction and condensation clicks in normal individuals?
Answer
Most normal hearing persons have very small cochlear microphonic (CM) waves on separate stimulation with rarefaction and condensation clicks. With a typical earlobe or mastoid electrode, even the ECochG AP component (wave I of the ABR) is only about 0.2 or 0.3 microvolts, so the CM is almost impossible to see unless there's no noise in the recording. Using a TM electrode, however, it's possible to see clear CM in a normal hearing subject and it's very easy to see the CM with the trans-tympanic approach (although it's hard to find normal hearing subjects who will participate in a study).
The CM in many ANSD patients is abnormally enlarged (maybe due to dysfunction of the efferent system) and often easy to detect even with an ABR recording technique.
James W. Hall III, PhD is an internationally recognized audiologist with 40-years of clinical, teaching, research, and administrative experience. He received his Ph.D. in audiology from Baylor College of Medicine under the direction of James Jerger. During his career, Dr. Hall has held clinical and academic audiology positions at major medical centers. Dr. Hall now holds appointments as Professor at Salus University and the University of Hawaii, and as Extraordinary Professor at the University of Pretoria South Africa. Dr. Hall is the author of over 160 peer-reviewed journal articles, monographs, or book chapters, and nine textbooks including the 2014 Introduction to Audiology Today and the 2015 eHandbook of Auditory Evoked Responses.
Related Courses
1https://www.audiologyonline.com/audiology-ceus/course/update-on-auditory-evoked-responses-27299Update on Auditory Evoked Responses: Evidence-Based ABR Protocol for Infant Hearing AssessmentA clinically feasible and effective protocol for infant hearing assessment with ABR is described. Research findings support all recommended stimulus and acquisition parameters. This course is open captioned.Please note: You may earn ABA Tier 1 credits for this course if you complete it as part of the auditory, textual, visual129USDSubscriptionUnlimited COURSE Access for $129/yearOnlineOnlyAudiologyOnlinewww.audiologyonline.comUpdate on Auditory Evoked Responses: Evidence-Based ABR Protocol for Infant Hearing AssessmentA clinically feasible and effective protocol for infant hearing assessment with ABR is described. Research findings support all recommended stimulus and acquisition parameters. This course is open captioned.Please note: You may earn ABA Tier 1 credits for this course if you complete it as part of the 27299OnlinePT60M
A clinically feasible and effective protocol for infant hearing assessment with ABR is described. Research findings support all recommended stimulus and acquisition parameters. This course is open captioned.
Please note: You may earn ABA Tier 1 credits for this course if you complete it as part of the course 27890.
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In this course chirp stimuli are described and their rationale for clinical application is discussed. Data are presented in support of the use of chirp versions of click and tone burst stimuli in ABR and ASSR assessment of infants and young children. This course is open captioned.
Please note: You may earn ABA Tier 1 credits for this course if you complete it as part of the course 27885, "Auditory Evoked Responses for Infant Hearing Assessment Series". Course 27885 contains recordings of all three events from our 2016 series on Auditory Evoked Responses for Infant Hearing Assessment. ABA Tier 1 CEUs can be earned only when all modules are completed as part of course 27885.
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Errors and operator-caused technical problems in ABR recording are identified and solutions are offered in this course. Common mistakes or oversights in analysis of ABR waveforms and findings will also be reviewed in order to support and inform an accurate and efficient diagnosis. This course is part of the Common Errors in Diagnostic Audiology series on AudiologyOnline - search the AudiologyOnline Course Library to browse and view the other courses in this series.
4https://www.audiologyonline.com/audiology-ceus/course/common-errors-in-diagnostic-audiology-30162Common Errors in Diagnostic Audiology: Tips for Improving Efficiency, Accuracy and OutcomesThis practical 3-part course series reviews standard diagnostic audiology procedures and the common errors that can lead to clinical inefficiency and inaccurate results. Easy to implement guidance is provided for cleaning up clinical protocols to ensure that audiological testing yields the highest quality information in a cost-efficient manner for an accurate diagnosis and improved patient outcomes.auditory, textual, visual129USDSubscriptionUnlimited COURSE Access for $129/yearOnlineOnlyAudiologyOnlinewww.audiologyonline.comCommon Errors in Diagnostic Audiology: Tips for Improving Efficiency, Accuracy and OutcomesThis practical 3-part course series reviews standard diagnostic audiology procedures and the common errors that can lead to clinical inefficiency and inaccurate results. Easy to implement guidance is provided for cleaning up clinical protocols to ensure that audiological testing yields the highest quality information in a cost-efficient manner for an accurate diagnosis and improved patient outcomes.30162OnlinePT180M
This practical 3-part course series reviews standard diagnostic audiology procedures and the common errors that can lead to clinical inefficiency and inaccurate results. Easy to implement guidance is provided for cleaning up clinical protocols to ensure that audiological testing yields the highest quality information in a cost-efficient manner for an accurate diagnosis and improved patient outcomes.
5https://www.audiologyonline.com/audiology-ceus/course/auditory-evoked-responses-for-infant-27890Auditory Evoked Responses for Infant Hearing AssessmentThis modular course reviews hearing assessment for infants and young children using ABR. An evidence-based protocol as well as chirp and brief-tone bone-conducted stimuli are discussed.auditory, textual, visual129USDSubscriptionUnlimited COURSE Access for $129/yearOnlineOnlyAudiologyOnlinewww.audiologyonline.comAuditory Evoked Responses for Infant Hearing AssessmentThis modular course reviews hearing assessment for infants and young children using ABR. An evidence-based protocol as well as chirp and brief-tone bone-conducted stimuli are discussed.27890OnlinePT180M
This modular course reviews hearing assessment for infants and young children using ABR. An evidence-based protocol as well as chirp and brief-tone bone-conducted stimuli are discussed.
