Definition of parameters
We defined a reproducible middle-latency biphasic wave as the effective
wave type. The waveforms with missing amplitude and unreproduced waves
were rejected. P1 and N1 were the first positive and negative peaks,
respectively. The P1 and N1 latencies (the interval between 0 ms and the
corresponding maximal peak) were calculated by the interval between P1
and N1, and the rectified amplitude (the vertical distance between the
P1 and N1 peaks) was recorded. The results were reviewed before and 1–3
months after CI. No significant change in VEMP was defined as no change;
disappeared VEMP was defined as clear
waveform before CI but waveform
disappeared after the implantation.