Dizziness and Vertigo Flashcards
vestibular system
peripheral: inner ear (labyrinth)
central: brainstem and cerebellum
oscillopsia
sense of imbalance
hair cell function
canals: angular acceleration
otolith: linear acceleration or head tilt
otolith
contains crystals that move or shift in response to movement
maintains eye position in respect to gravity
nystagmus
when one ear is stimulated the eyes move away from that direction: the brain is trying to compensate and move eyes back to normal
What is nystagmus caused by?
imbalance of firing signal
often due to virus or cold water in the ear
What can nystagmus cause?
sense of dizziness or vertigo
peripheral nystagmus
horizontal
unidirectional
simple
central nystagmus
vertical
complex
multidirectional
Fukada test
march in place with one eye closed
patient will begin to turn
Where are strokes often located that present with dizziness?
brainstem or cerebellum
About have of the time, strokes that present with dizziness have an initial MRI that is:
negative
Stroke: BE FAST
balance
eye
face
arm
speech
time to call 911
How to treat benign paroxysmal positional vertigo?
Dix-Hallpike maneuver
will lead to wobbling nystagmus if BPPV
What is subjective visual vertigo?
misaligned perception of verticality
Bucket test: align glow in the dark strip vertically and measure the degree of departure from true vertical
