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Physiology of Balance
Humans use three systems:
Visual
Proprioceptive
Vestibular
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Visual:
Orientation and balance are maintainedvia several visual properties:
Saccades
Smooth pursuit
Optokinetic reflex
The optokinetic response can also impart a
sense of acceleration in an individual
Depth perception
Visual cortex centers specially designed to
respond to vertical and horizontal stimuli
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Proprioceptive:
Proprioception contributes to balance in
the following ways:
Myototic reflex (deep tendon reflex)
Functional stretch response
Cervical proprioception
Includes a cervical-ocular reflex arc that canlead to physiologic or pathologic nystagmus
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Vestibular:
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Semicircular Canals
Respond to angular acceleration in the
plane of the canal.
Are functionally paired:
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Otolith organs:
Contain calcium carbonate crystals of
higher density than endolymph
This allows response to gravity (head tilt)
Respond to linear acceleration
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Vestibular Reflexes:
Vestibulospinal
Helps maintain center of gravity
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Vestibular Reflexes
Vestibulo-ocular
Helps maintain stability of visual field
Leads to physiologic nystagmus
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Vestibular Reflexes
Vestibulo-cervical:
Helps to maintain stability of the head
during movement of the torso.
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Balance Function Testing
History is the most important tool in
evaluation
Must obtain a concrete description ofsymptoms
Define vertigo for the patient
Ask about onset, duration of symptoms,aggravators, associated symptoms
(hearing loss), tinnitus, affect on daily life.
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Bedside Evaluation:
General physical examination
Vascular exam for possible posterior
circulation problem Cranial nerve exam
Cerebellar function (disdiadokinesis)
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Bedside Evaluation
Proprioceptive / Vestibulospinal
Romberg
Past-pointing
Fukuda
Deep tendon reflexes
Proprioception
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Bedside Evaluation
Vision
Visual acuity
Saccades
Smooth pursuit
Optokinetic reflex
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Bedside Evaluation
Static Vestibular Balance Nystagmus:
Check direction
Check for torsional component Check for gaze suppression
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Bedside Evaluation
Dynamic Vestibular Function Testing:
Head turn
Tests the gain of the vestibulo-ocular reflex
Head shaking
Utilizes a central pathway that remembers
angular velocity
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Bedside Evaluation
Provocative Measures:
Hyperventilation
Dix-Hallpike
Valsalva
Calorics
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Electronystagmogram
Utilizes charge difference between retina and
cornea to detect eye movement
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Infrared Camera Systems
Infrared camera directly measures eye
movement
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Electronystagmography
Saccades
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Electronystagmography
Gaze
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Electronystagmogram
Optokinetic Nystagmus
Positional Nystagmus
Paroxysmal Positional Testing
Tympanogram
Tulio Phenomenon
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Electronystagmogram
Caloric Testing
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Caloric Testing
Electronystagmogram
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Electronystagmogram
Caloric Testing
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Electronystagmogram
RotatoryChair
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Dynamic Posturography
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Dynamic Posturography
Conditions Tested:
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Case Study
26 y/o woman presents to the
emergency room several hours after the
sudden onset of severe dizziness withnausea and vomiting.
You call her up to your clinic.
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Case Study
Historyreveals no associated
symptoms.
No report of hearing loss
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Case Study
Physical Exam:
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Case Study
ENG:
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Case Study
ENG:
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Case Study
ENG