VIN results
The MVSP of nystagmus evoked in each stimulation were significantly
decreased in the control group when compared to those in the VS
patients, except for ipsilateral SCM stimulation at 100 Hz, which was
not statistically significant. Higher MVSP values were registered with
either ipsilateral or contralateral mastoid stimulation than with other
stimulation modes (p<0.05).
We did not observe any significant differences between the ipsilateral
and contralateral stimulation parameters in either the mastoid or SCM
between the case and control groups.
The areas under the curve and the sensitivity and specificity for each
cut points, are shown in Table 2.
There were no significant differences in sensitivity among the different
sites or stimulation sides (p > 0.05). The sensitivity and
specificity were highest (81, 8% and 73, 9%, respectively) when
calculated based on the presence of a VIN with any mastoid stimulation
(Figure 2).
Vertical VIN was detected in just 5 of 33 (15.5%) patients tested. No
subjects from the control group developed vertical VIN. Vertical VIN
sensitivity and specificity were not calculated due to small numbers of
patients.