Effects of cochlear implantation on VEMPs
VEMP changes before and after surgery were recorded, but only the CI ear
was analyzed. The postoperative VEMP test was performed 25–39 days
after surgery, and 64 CI ears were retested under the condition of
CI-off. 50% of the implanted ear cVEMP waveform and 39.1% of the oVEMP
waveforms disappeared after CI, the difference in the lost rate was not
statistically significant between the implanted ear cVEMP and oVEMP.
Moreover, we compare the p13 and n23 latency ,peak amplitude and
corrected amplitude, there was no statistically significant difference
in above the parameters before and after surgery.
In the group of 25 patients with
preoperatively present VEMPs, 40% and 31.75% lost their cVEMP and
oVEMP, respectively, after implantation. The variation between cVEMP and
oVEMP results before and after surgery of the IEM and control groups are
shown in Fig. 2. The independent
sample T-test showed that the abnormal cVEMP rate after surgery was
increased in the control group (p< 0.001). The abnormal
oVEMP rate after surgery of all patients together and the control group
significantly increased, but decreased in the IEM group (Fig. 2).