Measuring neck structures in relation to vestibular evoked myogenic potentials.
OBJECTIVE
This study examined whether neck length or thickness influences vestibular evoked myogenic potential (VEMP) responses.


METHODS
Twenty healthy children and 20 healthy adults underwent VEMP testing. Two reference points were selected for measuring neck length. Maximum thickness of the subcutaneous tissue and the sternocleidomastoid muscle was measured by ultrasonographic examination.


RESULTS
The mean latencies of peaks p13 and n23 in 20 healthy children were significantly earlier than those in healthy adults. Neck length significantly related to p13 latency in children, but not in adults. In contrast, corrected amplitudes did not differ significantly between children and adults. Ultrasonography guided measurement of the subcutaneous thickness in adults associated negatively with raw amplitude, but not with corrected amplitude.


CONCLUSIONS
Vestibular evoked myogenic potential latencies correlated positively to neck length in all subjects (children and adults), while raw amplitudes of VEMPs in adults correlated negatively with subcutaneous thickness. No correlation between neck thickness and corrected amplitude was observed.


CONCLUSIONS
Structural differences affecting latencies and raw amplitudes of VEMP responses should be considered when interpreting VEMP parameters.
Chang
Chun-Hsiang
CH
Department of Otolaryngology, National Taiwan University Hospital, Taipei, Taiwan.
Yang
Tsung-Lin
TL
Wang
Chi-Te
CT
Young
Yi-Ho
YH
D000200:Action Potentials / Q000502:physiology; D000293:Adolescent; D000328:Adult; D002648:Child; D002675:Child, Preschool; D003627:Data Interpretation, Statistical; D004576:Electromyography; D005071:Evoked Potentials / Q000502:physiology; D005260:Female; D006801:Humans; D008297:Male; D009046:Motor Neurons / Q000502:physiology; D009333:Neck / Q000033:anatomy & histology* / Q000000981:diagnostic imaging / Q000502:physiology*; D009334:Neck Muscles / Q000000981:diagnostic imaging / Q000502:physiology*; D014463:Ultrasonography; D014722:Vestibule, Labyrinth / Q000502:physiology*