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Table 1 Distribution of patients according to VNG test findings

From: Vestibular findings in patients with white matter disease

VNG findings

No abnormality

Abnormal

No of patients

%

No of patients

%

Spontaneous nystagmus

26

86.7

4

13.3

Gaze test

30

100

0

0

Optokinetic

30

100

0

0

Pursuit

30

100

0

0

Saccade

30

100

0

0

aPositioning

25

83.3

5

16.7

bPositional

17

56.7

13

43.3

cUnilateral caloric weakness

26

86.7

4

13.3

  1. N.B.: No isolated central vestibular deficit was detected in the study group. Some patients had multiple VNG abnormalities
  2. aThere was an abnormality in positioning test in 5 patients; 3 of them had in addition to the positioning nystagmus either spontaneous or positional nystagmus (of mixed peripheral and central criteria of vestibular lesion) as follows: vertical nystagmus, one of them diminished while others abolished or diminished with fixation, with a minimal subjective sense of dizziness
  3. bThe other patients with positional nystagmus were either peripheral with the following criteria: horizontal nystagmus, directional fixed, abolished with fixation and with a subjective sense of dizziness, or mixed peripheral and central criteria of vestibular lesion as follows: vertical nystagmus, abolished or diminished with fixation with a minimal subjective sense of dizziness
  4. c13.3% of the study group had unilateral caloric weakness; 2 of them were uncompensated as accompanied with spontaneous or positional nystagmus and the other 2 were compensated with unilateral caloric weakness as the only VNG finding