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Background: Cervical (cVEMP) and ocular (oVEMP) vestibular-evoked myogenic potentials are short-latency manifestations of vestibulo-ocular and vestibulocollic reflexes that originate from the utricle and saccule. The aim of this study was to determine whether simultaneously recording cVEMP and oVEMP more reliably detects the reflex responses than when making separate recordings. Methods: Both simultaneous recordings and conventional separate recordings of the cVEMP and oVEMP responses to air-conducted tone bursts were obtained in 39 healthy subjects. p13 and n10 latencies, and p13-n23 and n10-p16 amplitudes of cVEMP and oVEMP waveforms were measured, respectively. The asymmetry ratios (ARs) of the amplitudes were calculated. Results: In cVEMP testing, the p13 latencies and p13-n23 amplitudes did not differ significantly between simultaneous and conventional separate recordings. In oVEMP testing, the n10 latencies measured in simultaneous recordings showed a small but statistically significant prolongation compared to the results in separate recordings. Moreover, the n10-p16 amplitudes were significantly larger in the simultaneous recordings. The AR of simultaneous recordings of cVEMP and oVEMP did not differ between the two recording methods. Conclusions: Simultaneously recording cVEMP and oVEMP provides a reliable test and could be a clinically useful and simplified diagnostic tool for evaluating dizzy patients.
