vemp update - Participant Experience Poll A. I perform...

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1 Vestibular Evoked Myogenic Potentials: 2008 update Todd B. Sauter, MA, CCC-A Director – Department of Audiology UMass Memorial Medical Center Participant Experience Poll A. I perform VEMPs regularly B. I perform VEMPs infrequently C. I am hoping to begin VEMP testing in my clinic D. What’s a VEMP? VEMPs in 2005 Just gaining momentum as a clinical test Technique still extremely varied among labs and clinics Very little sensitivity/specificity data for various pathologies Very few devices designed for test VEMPs in 2008 Routine component of vestibular test battery Technique still somewhat varied among labs and clinics Growing clinical database of sensitivity/specificity data for various pathologies Several devices designed with VEMP protocols The sonomotor reflexes Vestibular Evoked Myogenic Potentials (VEMP) Acoustic Stapedial Reflex Post-Auricular Muscle Response (PAM) Masseter Reflex (Jaw response) History of VEMP Geisler, Frishkopf, and Rosenblith (1958) recorded short-latency responses to click stimuli from the inion (believed at the time to be cortical responses). Bickford, Jacobson, and Cody (1964) concluded the responses were vestibular in origin and also affected by tension of the neck muscles.
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2 History of VEMP Cody and Bickford (1969) and Townsend and Cody (1971) narrowed generation site to the saccule. Colebatch, Halmagyi, and Skuse (1994) described first consistent, clinically applicable VEMP procedure with electrodes on SCM muscles rather than inion Suggested VEMP Reflex Arc Saccule Inferior Vestibular Nerve Inferior Vestibular Nucleus Lateral (Deiter’s) Nucleus Lateral Vestibulospinal Tra ct SCM Musculature Vestibulocochlear Nerve Inferior Vestibular (Saccule; PSC) Slide courtes y of R. Steph en Ackl ey, Ph D Sternocleidomastoid Muscle Origin: Sternum/Clavicle Insertion: Mastoid Electrode Placement For P1 : Ground (Forehead) Non-inverting (+) electrode on mid to upper third of SCM belly.
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This note was uploaded on 04/11/2010 for the course AUD 831 taught by Professor Drlisakoch during the Spring '10 term at A.T. Still University.

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vemp update - Participant Experience Poll A. I perform...

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