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Response characteristics of vestibular evoked myogenic potentials recorded over splenius capitis in young adults and adolescents
Institution:1. Archie''s Cochlear Implant Laboratory, Hospital for Sick Children, Toronto, ON, Canada;2. Department of Communication Disorders, Hospital for Sick Children, Toronto, ON, Canada;3. Department of Otolaryngology Head and Neck Surgery, Hospital for Sick Children, Toronto, ON, Canada;4. Department of Otolaryngology Head and Neck Surgery, University of Toronto, Toronto, ON, Canada;5. Institute of Medical Science, University of Toronto, Toronto, ON, Canada;6. Department of Physiology and Pharmacology, University of Western Ontario, London, ON, Canada;7. Department of Psychology, University of Western Ontario, London, ON, Canada;8. Robarts Research Institute, University of Western Ontario, London, ON, Canada;9. Discipline of Biomedical Science, Sydney Medical School, University of Sydney, Sydney, NSW, Australia
Abstract:Background and objectivesExamine vestibular evoked myogenic potential (VEMP) responses recorded from surface electrodes over Splenius Capitis (SPC) in a seated position. Specific aims: (1) validate response characteristics of VEMP recordings from surface electrodes over Sternocleidomastoid (SCM) and over SCP and (2) assess age effects on responses in adolescents and young adults.Materials and methodsSimultaneous surface VEMP was recorded bilaterally from electrodes placed over the dorsal neck musculature at a location known from previous work to record from SPC in 15 healthy participants during trials with head rotation toward and away from the stimulated ear. VEMP was also recorded from electrodes over SCM, ipsilateral to the stimulus ear, in the same participants in a supine, head lift/turn position.ResultsResponse amplitudes significantly increased with contraction strength and decreased with age. Participants were able to maintain sufficient contraction strength (amplitude) with head rotation to reliably measure over SPC. Normalized response amplitudes measured from electrodes over contralateral SPC were largest with head rotation contralateral to the stimulus ear. Normalized amplitudes and peak latencies were comparable to the same measures from SCM obtained in supine, head lift/turn position.ConclusionsOtolith generated myogenic responses can be recorded seated from electrodes over the dorsal neck with head rotation contralateral to the stimulus ear. In this position, contralateral recordings are consistent with responses known from previous work to arise from SPC; ipsilateral recordings may include crosstalk from activated muscles nearby, including ipsilateral SCM. Overall, techniques targeting contralateral SPC during contralateral head turn may provide additional methods of recording VEMPs.
Keywords:Vestibular evoked myogenic potential  Vestibular testing  Splenius capitis  Sternocleidomastoid muscle  Otoliths  Saccule  Potenciales evocados miogénicos vestibulares  Prueba vestibular  Músculo esplenio  Músculo esternocleidomastoideo  Otolitos  Sáculo
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