Nystagmus

Question 1

5 types of acquired nystagmus

Answer 1

1. spontaneous
2. peripheral
3. central
4. positional
5. gaze-evoked

Question 2

Spontaneous nystagmus

Answer 2

caused by imbalance of vest. signals to the oculomotor neurons–causes constant drift in one direction that is countered by a quick mvmt in the opp dir.
- typ after acute vestib lesion
- lasts approx 24hrs

Question 3

Peripheral nystagmus

Answer 3

occurs w/ peripheral lesion and is inhibited when pt fixates vision on an object

Question 4

Central nystagmus

Answer 4

occurs w/ central lesion of BS/Cerebellum and is NOT inhibited by visual fixation on obj

Question 5

Positional nystagmus

Answer 5

induced by change in head pos
- SCC stimulate nystagmus that typ lasts few secs

Question 6

Gaze-evoked nystagmus

Answer 6

occurs when eyes shift from primary pos to alternative pos
- nystagmus is caused by pts inability to maintain stable gaze pos
- typ indicative of CNS patho and assocd w/ TBI or MS ***