Peripheral vestibular disorder (PVD) is serious and common. Clinically, giving an accurate diagnosis of PVD can be challenging. Vestibular evoked myogenic potential (VEMP) is an objective test to evaluate the integrity of vestibular organs, particularly saccule and/or inferior vestibular nerve. This study was performed to determine the sensitivity and specificity of VEMP using different stimuli. Fourty normal and 65 PVD subjects who fulfilled the inclusion criteria were recruited. While sitting comfortably, VEMP waveforms were recorded with active electrode on sternocleidomastoid muscle and negative electrode on upper forehead. Tone bursts (500, 750 and 1000 Hz) were delivered via headphones at 90 dBnHL and 5/s presentation rate. VEMP parameters for each stimulus (amplitude and latency of P1 and N1 peak) were analyzed accordingly. Receiver operating characteristic (ROC) was performed to determine the sensitivity and specificity of VEMP at different test frequencies. N1 amplitude of 750 Hz stimulus produced the most ideal sensitivity (65% on right and 63% on left) and specificity (83% on right and 78% on left). The importance of using a few tone bursts in VEMP test in order to minimize the false negative in cases might be encountered in clinics as the certain tone burst had inadequate sensitivity in detecting PVD cases. The 750 Hz stimulus produced the most ideal VEMP with adequate values of sensitivity and specificity, at least in this study.
The purpose of this study was to translate and adapt the Vestibular Rehabilitation Benefit Questionnaire (VRBQ) into Malay (My-VRBQ). This is to add on to the limited number of
vestibular questionnaire available in Malay version. After the permission from the original
author was obtained, the process of adaptation began with forward-translation by the author with
audiological background and a linguistic expert. Then, the process of backward translation into
English were completed by three bilinguals who were proficient in both Malay and English. The final version of the draft was evaluated for its content validity, which was conducted by five professionals with audiological or speech pathology backgrounds. Additionally, its face validity was determine amongst 32 respondents with diverse backgrounds. Ten participants diagnosed with vestibular problems were recruited in the My-VRBQ for internal consistency validation process. They were enlisted from two hospitals in the East Coast of Malaysia. Based on the comments and
suggestions made by the validators; some changes in terms of the appropriateness of the instructions, items and the sentence structure were made. In the consistency analysis, the My-VRBQ revealed good internal consistency based on Cronbach alpha values (0.77 to 0.96). A translated and validated My-VRBQ has the potential to be used clinically to document vestibular rehabilitation benefits. Nevertheless, future studies are encouraged to further support the present study findings.