Station Disorder

Question 1

what maintains balance

Answer 1

CNS - parietal insular vestibular cortex and cerebellum

inner ear - semicircular canals

eyes

proprioceptors

Question 2

explain station testing

Answer 2

narrow based stance 
stand with heels and toes together 
dr observes sway in eyes 
patient closes there eyes 
doctor observes direction of sway 
repeat test

Question 3

interpretation of test

Answer 3

sway eyes open that doesnt get worse with eyes closed - cerebellar problem

no sway when eyes open, sway same direction each attempt - fall toward side of faulty lateral SC DUCT

no sway eyes open, sway inconsistenly on each attempt - proprioceptive lesion DCML

Question 4

dizziness is a __

Answer 4

symptom

Question 5

what are causes of dizziness

Answer 5

CVD - arrhythmias, mitral valve prolapse, hypotension

Multiple sensory deficit - older patient with type 2 diabetes and cataracts

psychological problem - ill defined lightheadedness

mal de debarquement syndrome - land sickness

Question 6

vertigo is a ___

Answer 6

sign

Question 7

what are the terms used to describe vertigo

Answer 7

geotropic - room spins

egotropic vertigo - person spins

Question 8

common causes of vertigo

Answer 8

vestibular neuronitis - viral infection of vestibular n, vertigo without hearing loss

labyrnithitis - viral infection of cochlear and vestibular nerve, vertigo with hearing loss

menieres syndrome - long term SN loss, tinnitus, episodic vertigo, unilateral, 60 years old, males

head trauma - physcial disruption of receptors in ducts or otolithic organs

Question 9

labyrithitis is a problem inside the ___ when the labyrinth gets swollen and inflamed

Answer 9

inner ear

Question 10

labyrinthitis may cause what?

Answer 10

sudden vertigo - makes you feel like youre spinning - ego

hearing loss

tinnitus - constant ringing

Question 11

what are the two forms of benign positional postural vertigo

Answer 11

canalithiasis - otoliths free in canal causes vertigo - positional vertigo that fatigues

cupulolithiasis - otoliths are attached to cupula and deforms cupula - positional vertigo that does not fatigue

Question 12

explain cervicogenic vertigo

Answer 12

assymetric proprioception from neck leads to assymtry activity in vestibular nuclei, giving them impression that room or person is spinning