Journal of Otolaryngology and Ophthalmology of Shandong University ›› 2020, Vol. 34 ›› Issue (5): 51-55.doi: 10.6040/j.issn.1673-3770.1.2020.083

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Abnormality rate of vestibular evoked myogenic potentials in patients with primary and recurrent benign paroxysmal positional vertigo: a clinical observation

  

  • Received:2020-08-20 Published:2020-11-17

Abstract: Objective This study aimed to compare the abnormality rate of vestibular evoked myogenic potentials(VEMPs)in patients with primary and recurrent benign paroxysmal positional vertigo(BPPV)and test the hypothesis that otolith dysfunction causes the recurrence of BPPV. Methods Cervical VEMP(cVEMP)and ocular VEMP(oVEMP)tests using air-conducted 500 Hz tone-burst stimuli were performed on 57 patients with unilateral primary BPPV(n=36)and recurrent BPPV(n=21)between June 2019 and May 2020. Abnormalities in cVEMP and oVEMP were compared between the primary and recurrent BPPV groups. Results (1) The differences in sex, the involved side, and canal between the primary and recurrent BPPV groups were not significant; however, the difference was statistically significant in terms of age; (2) Of the 57 BPPV patients, cVEMP or oVEMP was not elicited in 21 cases(36.84%)and 35 cases(61.40%), respectively. The abnormality rate of oVEMP was much higher(P<0.05); (3)Abnormal cVEMP was observed in 16 of 36(44.45%)and 5 of 21(23.81%)cases in the primary and recurrent BPPV groups, respectively. Abnormal oVMEP was observed in 19 of 36(52.79%)and 16 in 21(76.19%)patients in the primary and recurrent BPPV groups, respectively. Differences in the abnormality rates of cVMEP and oVMEP were not found between the primary and recurrent BPPV groups(P>0.05); (4) When the recurrent BPPV group was further divided into 2-times groups and ≥3-times group according to the recurrent frequency, there were also no statistical differences in the VEMP abnormality rate in these three groups(P>0.05). Conclusion The results showed no significant difference in the abnormality rate of cVEMP and oVEMP between the primary BPPV and recurrent BPPV groups, indicating that the possible recurrent mechanism of primary BPPV still needs to be further studied.

Key words: Benign paroxysmal positional vertigo, Cervical vestibular evoked myogenic potential, Ocular VEMP, Primary, Recurrent

CLC Number: 

  • R764.3
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[8] To record the bone-conducted vestibular-evoked myogenic potential(BC-VEMP)in order to provide a reference for the clinical evaluation of vestibular function in normal-hearing children. MethodsThirty-one normal-hearing children(62 ears)aged 4-12 years were selected to undergo BC-VEMP determination. These children were divided into two groups according to age. Those aged 4-5 years(11 children, 22 ears)belonged to one group while those aged 6-12 years(20 children, 40 ears)belonged to the other. A 60 dB nHL was used as the initial stimulus intensity by which the N1 latency, P1 latency, n1-p1 interval, n1-p1 amplitude, amplitude asymmetry ratio, and threshold of cervical VEMP(CVMP)and ocular VEMP(ocular VEMP)were recorded. The SPSS software was used for statistical analysis. ResultsThere was no significant difference in P1, N1 latency, P1-N1 wave interval, P1-N1 amplitude, threshold, and amplitude asymmetry ratio of BC-oVEMP between the 4-5-year-old and the 6-12-year-old groups(P>0.05). There was no significant difference in N1, P1 latency, n1-p1 wave interval, n1-p1 amplitude, threshold, and amplitude asymmetry ratio of BC-VEMP between the two groups(P>0.05). ConclusionBC-VEMP is a feasible auxiliary examination of vestibular function. The establishment of normal values of BC-VEMP in different age groups can provide a reference for clinical evaluation of vestibular function in children.. The establishment of a normal value of bone-conducted vestibular-evoked myogenic potential in normal-hearing children [J]. Journal of Otolaryngology and Ophthalmology of Shandong University, 2020, 34(5): 72-77.
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