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Objective To explore the clinical characteriitics of vestibular-evoked myogenic potentials (VEMPs) in patients with benign paroxysmal POSiOMI vertigo (BPPV) . Methods We enrolled 67 BPPV patients as the observation group and 19 (38 ears) age- and gender-matched normal subjects as the normal control group. Both patients and normal subjects underwent conventional ocular-VEMP (oVEMP) and cervical-VEMP (cVEMP) tests in bllateral ears. The results were compared between the affected ears, the contralateral ears of the patients and the normal control ears. Results oVEMP was elidted in 29 affected ears (43.3%), 28 contralateral ears (41.8%) and 27 normal ears (71. 1%) . No significant difference was found in response rate between the affected ears and the contralateral ears (P>0.05). However, significant difference could be found between the affected group (both affected ears and contralateral ears) and the normal group (P<0.01). cVEMP could be elicited in 42 affected ears (62.7%), 41 contralateral ears (61.2%) and 32 normal ears (84.2%). There were no significant difference in response rate between the affected ears and the contralateral ears (P>0.05) ; however, significant difference could be found between the affected group (both affected ears and contralateral ears) and the normal group (P<0.05). The response rate of oVEMP was remarkably lower than that of cVEMP (P<0. 05). However, no significant difference was found in oVEMP or cVEMP parameters (threshold, N1 latency, P1 latency, or amplitude) among the groups (P > 0. 05). Conclusion The response rates of oVEMP and cVEMP in the affected and the contralateral ears in the affected groups are sigrnficantly lower than those in normal controls; low response rates are more likely to appear in oVEMP tests. The waveforms of oVEMP and cVEMP tend to remain normal in patients with BPPV. [ABSTRACT FROM AUTHOR]

Objective: To observe the ocular vestibular evoked myogenic potential (oVEMP) and the cervical vestibular evoked myogenic potential (cVEMP) in patients with vestibular diseases., Method: From March, 2011 to March, 2012, 13 patients (14 ears) with peripheral vestibular diseases were recruited. Each patient underwent conventional oVEMP and cVEMP examinations elicited by intensive air conducted sound (short tone burst, 500 Hz) in bilateral ears., Result: Thirteen cases (14 ears) were included in this study. They were 3 cases (3 ears) with Ramsay Hunt syndrome, 3 cases (4 ears) with acoustic neuroma, 1 case (1 ear) with VII and VIII cranial nerve trauma after head injury, 2 cases (2 ears) with vestibular neuritis, 3 cases (3 ears) with Meniere's disease, and Icase (1 ear) with unilateral hypoplasia of the internal auditory canal. Altogether, oVEMP could be elicited in only 2 ears (14. 3%) and cVEMP were found abnormal in 11 ears (78. 6%)., Conclusion: The otolithic vestibular end organs and their input pathways could be examined by cVEMP and oVEMP examinations in patients with peripheral vestibular disorders.

Objective: To identify the characteristics of the air-conducted ocular vestibular-evoked myogenic potential (oVEMP) in the young normal Chinese subjects., Methods: Twenty five normal subjects were recruited for conventional examinations of oVEMP. The subjects were 19 - 45 years of age [(24.3 ± 5.6) years], 12 males and 13 females. 500 Hz air-conducted tone burst was employed for examination. The threshold of oVEMP in each ear was examined; patterns of these waves were observed and the normal ranges of the oVEMP waves responded to 100 dBnHL were calculated., Results: All subjects were elicited with normal oVEMP N1-P1 waves in both ears. The response rate in these subjects was 100%. The threshold of oVEMP examination was (86.6 ± 3.6) dBnHL (x(-) ± s), latency N1 (10.1 ± 0.4) ms, latency P1 (14.7 ± 1.2) ms, interval N1-P1 (4.5 ± 1.0) ms, amplitude (7.9 ± 4.4) µV., Conclusions: Air-conducted oVEMP is a kind of vestibular-ocular reflex respond to intensive sound generated by otolithic vestibular end organs. It is stable in the young normal subjects with minor variabilities.