Nystagmus

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Author:
angelletta
ID:
115805
Filename:
Nystagmus
Updated:
2011-11-10 15:02:18
Tags:
Neuroopthalmology Ch9
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Description:
Neuroopthalmology Ch 9 Nystagmus
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  1. What is oscillopsia?
    sensation of movement
  2. Nystagmus is named for the _____phase. The pathologic phase is the _____phase
    • Fast
    • Slow
  3. What are 2 key characteristic of Congential Nystagmus?
    • reversal of the OKN
    • velocity of the slow-phase increases exponetially
  4. Describe Congential Nystagmus
    • associated with normal or abnl vision
    • no oscillopsia
    • + null point
    • better with convergences/worse with distance
    • resolves in sleep
  5. Latent nystagmus-which eye is the fast phase toward
    Fast phase toward the uncovered eye
  6. Monocular nystagmus of childhood is associated with what brain lesion?
    optic/chiasmal glioma
  7. Spasmus nutans. ID the following
    Triad
    lesion location
    • head tilt
    • head nodding
    • nystagmus
    • no lesion- it is benign and resolves within first decade.Rule out Monocular nystagmus of Childhood
  8. What is gaze evoked nystagmus? Fast phase?
    Location of dz? Horizontal
    Vertical
    • Inability to maintain fixed ecentric gaze
    • direction of gaze
    • neural integrator
    • -Horizontal- nucleus prepsoitus hypoglossi
    • -Vertical- Interstital nucleus of Cajal
  9. Vestibular nystagmus associated with
    • hearing loss
    • tinnitus
    • vertical torsion
    • dampens with fixation
  10. Causes of vestibular nystagmus
    • Viral Vestibular neruontitis
    • Meniers
    • BPPV
    • Aminoglycosides
  11. Down Beat Nystagmus worse in which gaze
    down and to the side
  12. Cause of Downbeating nystagmus?
    Lesion
    Drugs
    • Cervical Medullary jnx
    • Arnold Chiari
    • Lithium codeine
  13. Upbeating nystagmus lesion location?
    medulla
  14. See-Saw associated with what type of tumor?
    cragnipharygioma
  15. Periodic Alternating Nystagmus lesion location?
    cerebellar nodulus
  16. Ocular bobbing lesion location?
    pontine
  17. Flutter/opsoclonus lesion location?
    • Neuroblastoma -child
    • adult-MS
    • Drugs
    • brainstem encephalitis
  18. Oculopalatal myoclonus lesion location?
    inferior olivary nucleus
  19. Oculomasticatory Myorhythmia associated with
    Whipple dz, vertical saccadic palsy, nystagmus with masticatory muscles
  20. Cerebral lesion looks which way
    Brainstem lesions looks which way
    • toward the lesion
    • away from the side of the lesion

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