exam 2 - vets lan testing Flashcards
what does the superior vest nerve serve
anterior SSC
horizontal SSC
urturicle
what does the inf vest nerve serve
posterior SSC
saccule
what is the purpose of oculomotor testing
measure eye movements
making sure the eyes are working
what part of nys tell us about VOR
the slow phase
what is the purpose of positional testing
test the effect of different head positions within the gravitaional field
no the head moving but the stationary head positions
directional fixed nystagmus
peri
directional chnaging nys
central until proven other wise
what is calorics purpose
to test the sensitivity of the horizontal canal to thermally induced ndolymph movement
what is a normal caloric response
nys and vertigo
warm - caloric response
nys in the same direction at the ear you are testing, right ear, right beating nys
in caloric testing what does a absent response indicate
complete loss of of vest function
bilateral vestibular loss - caloric other finding
slow component velocity <10 m/sec for all 4 standard irragations
what is caloric testing good for
UVL - laterlizes a peri hypofunction
what can you used caloric testing on
horizontal canal and superior vestibular nerve only
what is the purpsose of rotational testing
test the senitivity of the horizontal canals to physiological movements
can you test just one ear with the rotational testing
no you are stimulating both laybrinths stimulantously
is rot testing performed in the light or the dark
dark
with hypo of the peri vest system what happens to gain
reduced gain
if gain is abnormally large what does this indicate
cere disorder
what is directional preponderance
asymmertric response between magnitude of the right and left eye
on going VOR imbalance
what is action that suppress the VOR and decreases gain
rot while viewing a moving object
does not work - central abnormality
what action enhances VOR and increases gaine
rot while viewing a earth fixed strip
does not work - central abnormality
benefits of rot testing
physical stim
not sym provoking
in rotational test a very low gain is an indication of what
bilateral dys
what is the purpose of VHIT
test sensitivity of canal high speed movements
what canals does the VHIT test
vertical and horizontal
and test on canal at a time
what is vest evoked myogenic potentials (VEMP)
sound excites the vestibular organs
what is the VEMP testing
otolith organs and different divsion of the vestibualr nerve
two types of VEMPS
ocular
cervical
cervical VEMPS
sacccule - inferior vest nerve
isp SCM
loud clicks evoke brief saccule excitement and decrease of isp SCM EMG
ocular VEMPS
urticle - superior vest nerve
contra inferior oblique
