INO summarised Flashcards
(5 cards)
1
Q
INO
A
MLF lesion
Medial rectus pasly (6th nerve)
Abducting eye has dissociated gaze evoked nystagmus
small lesion = unaffected
no MLF dammage means adduction defect
convergence intact
2
Q
Unilateral
A
6th nucleus affected
saccades and piursuit afftected
adducting nystagmus in unaffected eye
Lower MLF lesion
skew deviation
adduction and convergence affected
3
Q
Bilateral
A
Larger lesion
effects both MLF
adduction loss
ataxial and upbeat nystagmus
px assymptomatic
vertical gaze defect
neurological defects
4
Q
INO Aetiology
A
MS
Stroke
Bilateral artery occlusion
tumours (rare)
5
Q
INO signs
A
EOP / EOT
Increases on attemoted adduction
Imapried slow saccades
assymetrical Bilateral INO
lateral gaze = ataxial nystagmus
