Vestibular disorders
Download
1 / 72

VESTIBULAR - PowerPoint PPT Presentation


  • 1597 Views
  • Updated On :

VESTIBULAR DISORDERS. MAINTAINING BALANCE. Requires the maintenance of COG within the BOS Requires adequate m strength, control, selection of appropriate strategies and the ability to organize sensory input. Age related changes that affect balance. Dec. reaction time

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'VESTIBULAR' - Solomon


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
Vestibular disorders l.jpg

VESTIBULARDISORDERS


Maintaining balance l.jpg
MAINTAINING BALANCE

  • Requires the maintenance of COG within the BOS

  • Requires adequate m strength, control, selection of appropriate strategies and the ability to organize sensory input


Age related changes that affect balance l.jpg
Age related changes that affect balance

  • Dec. reaction time

  • dec. proprioception of the feet

  • dec. vibratory sense of the toes

  • inc. sway while standing

  • significant dec. in vestibular sensory input


Anatomy and physiology of the peripheral vestibular system l.jpg
Anatomy and physiology of the peripheral vestibular system

  • Located in the temporal bone and is made up of three semicircular canals posteriorly, the vestibule in the middle, and the cochlea anteriorly.

  • Membranes are filled with endolymph


Peripheral vestibular system l.jpg
Peripheral vestibular system

  • Consists of semicircular canals, utricle and saccule, otoliths, and vestibular nerve.

  • Sensory epithelium lining the utricle and saccule contains hair cells that are embedded in the otolithic membrane, which is gel-like and contains calcium carbonate crystals.

  • This sensory lining responds to quick tilting mvt. of the head and rapid linear acceleration and deceleration.


Otolith structures l.jpg
Otolith structures

  • Otolithic membranes cause bending of the hairs in one direction or another. Except when the otolithic membrane is in a horizontal plane.

  • Detect position of the head with respect to gravity and sense translational movements in which the head is steady but the body as a whole moves.


Saccule l.jpg
Saccule

  • Senses vertical movement as when going up in an elevator


Utricle l.jpg
Utricle

  • Detects horizontal movements such as when one is in a car moving forward


Semicircular canals l.jpg
Semicircular canals

  • Ant. Post. and lateral semicircular canals are at right angles to each other

  • Detect angular head movement in all planes

  • Function to generate compensatory eye movement and also to generate postural movements


Slide10 l.jpg
VOR

  • Stimulated in response to head movement

  • Serves to allow one to maintain focus on a target while the head is moving

  • Causes eye movements that are = in magnitude but opposite in direction of head movements


Pathology of the vestibular system l.jpg
Pathology of the vestibular system

  • Categorized as perpheral or central disease.

  • In acute injury, the firing rate of the vestibular nucleus on the side of the lesion is decreased

  • Unilateral lesions of the peripheral vestibular system cause disruptions of the vestibulospinal reflexes and the VOR which can be static or dynamic


Pathology con t l.jpg
Pathology con’t

  • Static disturbances of the VOR causes spontaneous nystagmus because of imbalance of the vestibular nuclei

  • Impaired vestibulospinal reflexes causes wide based ataxic gait pattern and dec. dynamic postural control

  • Disruption of the semicircular canals results in vertigo- the world is spinning(or person)


More pathology l.jpg
More pathology

  • Otolith dysfunction causes the pt. to feel as though they are tilting, moving vertically, or ant/posteriorly.

  • Bilateral vestibular deficits causes severe dynamic disturbance in the VOR and vestibulospinal reflexes. Oscillopsia and significant postural instability


Vestibular disorders14 l.jpg
Vestibular disorders

  • Labyrinthitis and Vestibular Neuritis

    • comes from inflam. Of inner ear and/or auditory or vestibular nerve because of infection

    • Sudden onset vertigo, nausea, unilateral hearing loss and tinnitus. Vestibular neuritis no hearing loss

    • Sx last 12-36 hours resolve over time. May c/o lightheadedness inc. by rapid head mvt.


Benign paroxysmal positional vertigo l.jpg
Benign Paroxysmal Positional Vertigo

  • (BPPV) caused by head trauma, inner ear infestion, degeneration of inner ear structures

  • Asymmetrical vestibular response to head mvt. Caused by an inappropriate response in one of the semicircular canals that stimulates fluid flow in the affected canal. Also caused by otolith debris in horizontal canal.

  • Sx. Position vertigo,dizziness,disorientation


Meniere s disease l.jpg
Meniere’s Disease

  • Etilogy-unknown. Possible pressure imbalance in endolymph

  • Spontaneous episodes of extreme vertigo, nausea,ear fullness, tinnitus, and unilateral hearing loss

  • Sx last several hours and may result in disequlibrium

  • Recurring episodes


Ototoxicity l.jpg
Ototoxicity

  • Exposure to ingestion of a chemical agent or med that is known to damage the auditory or vestibular system. Salicylates, anticonvulsants and some diuretics may reverse. Streptmyocin, neomycin and gentamicin may be permanent

  • Sx. Vertigo and disequilibrium


Perilymph fistula l.jpg
Perilymph Fistula

  • Caused by an abnormal opening between the air space in the middle ear and the fluid filled space in the inner ear that results in leakage of fluid into the middle ear and stimulation of the inner ear organs.

  • Recent head/ ear injury, infection change in air pressure

  • Sx. Brief dizziness/vertigo, disequlib., nausea brought on by pressure changes


Central dizziness l.jpg
Central dizziness

  • Dysfunction at the vestibular nuclei and connections with cerebellum and BS

  • Sx. Constant feeling of unsteadiness

  • Poor candidates for vestibular rehab


Idiopathic vestibular degeneration l.jpg
Idiopathic Vestibular Degeneration

  • Unknown cause. Seen in the aged. Degeneration of the ear structures

  • Sx. Multisensory dizziness with impaired vision, proprioception, and vestibular functions, unsteadiness and frequent falls


Acoustic neuroma l.jpg
Acoustic Neuroma

  • Tumor in the internal auditory canal or cerebellopontine angle

  • Sx. Gradual unilateral, hearing loss, unilateral tinnitus, mild dizziness, ear pressure, ear fullness. Large tumors affect the facial nerve


Vestibular migraines l.jpg
Vestibular Migraines

  • Occur with headaches

  • Sx short spells of vertigo from 2-20 minutes


Vascular disorders l.jpg
Vascular disorders

  • Vertebrobasilar artery insufficiency, which leads to hypofusion and ischemia of areas within the vestibular system, including the labyrinth and brain stem.

  • Common cause of vertigo in those over 50

  • Sx. Abrupt vertigo, lasting several minutes with nausea and vomiting

  • Sx. Visual hallucinations, drop attacks or weakness, visual field cuts, diplopia and headaches help to confirm DX.


Otologic tests l.jpg
Otologic Tests

  • Audiometric evaluation

  • Tests of VOR system-caloric test, visual autorotation test, and electronystagmography

    • information about the symmetry of a vestibular lesion affecting the horizontal semicircular canals

    • useful in determining the appropriate interventions to promote gaze stab. and habituation to dizziness


Vor testing l.jpg
VOR Testing

  • Eyes should move at the same speed as the head, with no abnormal latency or delay

  • The amt. Of eye movement (gain) should be equal to the amount of head mvt.

  • VOR is tested for:

    • speed (phase)

    • strength (gain)

    • symmetry


Caloric test l.jpg
Caloric test

  • Only test that checks the function of one vestibular apparatus at a time


Visual autorotation l.jpg
Visual autorotation

  • Measures the function of the horizontal semicircular canals and the gain and phase patterns for vertical or horizontal VOR

  • Assymmetry indicates a peripheral lesion, the eyes deviate toward the impaired side


Electronystagmography l.jpg
Electronystagmography

  • Series of tests that assess spontaneous and positional nystagmus

  • Allow for sensitive and accurate recording of eye movements with the eyes open or closed, in darkness or in a lighted room


Examination l.jpg
Examination

  • Distinguish between s&s of peripheral and central vestibular lesions in order to implement appropriate interventions

  • Multisystem involvement may complicate this as in DM, CV disease or arthritis


Patient history l.jpg
Patient History

  • Caregiver may be present for your interview

  • Of import: Hx of current condition and prior tx received, functional level including any recent declines, medications (ototoxic drugs), other tests and measures, past history of present condition, PMH, PSH etc.


History of current condition l.jpg
History of current condition

  • Questions regarding course- onset, duration, and frequency

  • Precipitating, exacerbating, and relieving factors; and associated symptoms


Symptoms associated with peripheral disease l.jpg
Symptoms associated with peripheral disease

  • Peripheral vestibular disease

  • Distinct episodes and/or sudden onset of sx

  • Dizziness lasting <1 minute (BPPV)

  • Dizziness lasting hours with a gradual dec. ( labyrinthitis, neuritis, Meniere’s dis)

  • Motion provoked disequilibrium

  • Sx that inc. or occur with change in head position or eyes closed

  • tinnutis, hearing loss, ear pain, or fullness, esp. if unilateral


Central vestibular disease l.jpg
Central vestibular disease

  • Gradual onset

  • Dizziness lasting >24 hours without decline

  • Lightheadedness and disequlibrium without motion

  • Symptoms unaffected by position change

  • Slurred speech, syncope,near syncope, numbness, tingling of face or extremities, diplopia


Diseases mimicing vestibular disease l.jpg
Diseases mimicing vestibular disease

  • Postural hypotension

  • Sx. Only in standing

  • Peripheral neuropathy

  • Bony changes in the spine or vertebral artery disease


Past medical history l.jpg
Past medical history

  • Focus on hx of head trauma or rapid pressure change, positional vertigo, ototoxic drug or chemical exposure, food allergies, peripheral neuropathies, noise exposure, autoimmune disorders, psychiatric disorders, surgeries, viral and bacterial infections,significant eye disease, demyelinating disease, epilepsy, PD, brain tumors, CVA, TIA,migraine may indicate a central cause


Functional status and activity level l.jpg
Functional Status and Activity level

  • Ask about ADLs, IADLs,

  • Older persons with vestibular disease or balance disorders may dec. their activity levels to minimize sx. Therefore have dec. strength and ROM


Slide37 l.jpg
Meds

  • Recent or current use of antidepressants, sedatives, tranquilizers, and vestibular suppressants(meclizine) can cause cerebellar brain stem sx. Some duiretics may cause transient vestibular hypofunction


Tests and measures l.jpg

Aerobic capacity

cognition

use of assistive devices

community integration

cranial nerve integrity

barriers

integument

jt. integrity

Mobility

motor function

sensory integration

posture

ROM self care/home management

sensory integrity

static/dynamic postural control

Tests and measures


Visuomotor tests l.jpg
Visuomotor tests

  • Static exam:

    • Peripheral disease nystagmus is horizontal or rotary and diminishes with visual fixation

    • Central disease nystagmus is vertical and may inc. with visual fixation. May also be more intense in one eye

    • In spontoneous nystagmus, note the direction, ask pt. to fix on a target and see whether the nystagmus changes


Visuomotor tests con t l.jpg
Visuomotor tests con’t

  • Dynamic exam:

    • Head shaking is used to predict unilateral vestibular disorders

    • Close eyes , flex to 30, shake as in saying NO for 15 sec with eyes closed. Partially uncompensated vest loss affecting horizontal canals results in nystagmus, beating away from the lesion site


Rotational tests vor l.jpg
Rotational tests (VOR)

  • Ask pt. to focus on your finger. While looking at your finger, rotate the head as in NO, first at slow speeds then faster. As speed increases look to see whether visual fixation is maintained or pt. loses visual contact and must make saccades to regain visual contact with the target.

  • Eval the accuracy and speed of tracking


Oculomotor tests l.jpg
Oculomotor tests

  • Used to eval the integrity of cerebellum in producing efficient eye mvts by assessing pts. control of eye mvt.

    • Saccades are vol or reflexive rapid eye mvts. To bring the target in line with the center of vision

    • Smooth pursuits are used to maintain stable gaze on objects that are moving within the visual field

    • Accurate smooth pursuits match the velocity of the target.

    • Gross abnormalities indicate the need to see a Neurologist


Hallpike maneuver l.jpg
Hallpike Maneuver

  • Used to elicit nystagmus and vertigo commonly associated with BPPV

  • Pt is seated, eyes open, head is turned 45 pt is brought rapidly into ext in supine. In BPPV the pt. will have vertigo and rotary nystagmus after 2-15 sec. Symptoms last 15-45 sec. Pt is then brought back up to sitting. Direction and duration are related to which of the semicircular canals are affected


Romberg test l.jpg
Romberg test

  • Assess the integrity of vertical semicircular canals, involved with the vestibulospinal pathways for balance control.


Other tests l.jpg
Other tests

  • Orthostatic tests

  • Limits of stability

  • Computerized dynamic posturographic studies

  • CTSIB

  • POMA

  • Berg


Interventions for vestibular disorders l.jpg
Interventions for Vestibular Disorders

  • Meds

    • meclizine or dimenhydrinate. Acute symptoms

    • may retard natural vestibular compensation process and limit full recovery of balance function

    • side effects slowing of mental processing and reaction time


Vestibular rehabilitation l.jpg
Vestibular Rehabilitation

  • Uses interventions to eliminate of decrease symptoms associated with peripheral vestibular pathology.

  • Consists of exercises to promote:

    • adaptation

    • substitution

    • in order to decreases symptoms and maximize balance


Types of exercises l.jpg
Types of exercises

  • Repeated head mvts. To promote habituation to dizziness

  • Positioning maneuvers to prevent onset of vertigo

  • Exercises to improve eye-head coordination,fixation of gaze and balance retraining


Rationale l.jpg
Rationale

  • Designed to incorporate visual and proprioceptive cues because the vestibular system interacts with both of these systems

  • Simulate conditions that produce symptoms in the environment by using small and full visual field stimuli

  • Focuses on compensatory strategies for managing safely in the environment, fall prevention LE ROM and strengthening as well as aerobic conditioning


Frequency and duration l.jpg
Frequency and duration

  • Usually 4-8 weeks with PT OT as required for impairments additionally 1-2 per week

  • Specific home program that is very progressive. These pts may need to do the HEP indefinitely.

  • Pt participation and compliance is a must


Goals of vestibular rehabilitation program l.jpg
Goals of Vestibular Rehabilitation program

  • Inhibit effects of vertigo

  • Improve visual-vestibular interactions

  • Improve static postural stability

  • Improve dynamic postural stability

  • Increase LE M strength and flexibility

  • Inc. neck ROM

  • Inc physical activity levels

  • Dec. anxiety and stress

  • Dec. fall risk


Indications l.jpg
Indications

  • Those with symptoms > 6 months

  • Acute or abrupt loss of vestibular function

  • unilateral vestibular loss

  • vestibular symptoms provoked by movement

  • stable bil vestibular loss(peripheral or central)


Habituation exercises l.jpg
Habituation exercises

  • Specific movements/positions that provoke symptoms.

  • Recovery is said to be due do plasticity of the vestibular system

  • Gaze stabilization exercises work to retune the VOR to eliminate retinal slippage and reduce motion induced disequlibrium


Adaptation exercises l.jpg
Adaptation exercises

  • Stimulus specific, and the stimulus must be maintained for a significant time

  • Pt may have to work through discomfort to achieve results

  • Exercises must be performed exactly as specified


Substitution exercises l.jpg
Substitution exercises

  • Utilize remaining healthy sensory components of balance (vision or proprioception) to take over for the impaired sensory component

  • Indicated with complete loss of vestibular function bil.



Adaptation l.jpg
Adaptation

  • Stable unilateral and bilateral lesions or bilateral hypofunction

    • labyrinthitis, neuritis, inactive Meniere’s disease, and postsurgical ablation

    • Ototoxicity, DM, Aging


Substitution l.jpg
Substitution

  • Nonvestibular balance disorders such as diabetic peripheral neuropathy or other neuromuscular conditions


Poor candidates for vestibular rehab l.jpg
Poor candidates for vestibular rehab

  • Unstable unilateral lesions such as active Meniere’s disease, perilymph fistula, and middle ear disease

  • Level of activity and strength of response to motion in the affected ear are not consistent. For the CNS to adjust, incoming information must be stable and predictable


Vestibular exercise protocols l.jpg
Vestibular exercise protocols

  • Start with the least difficult position and progress to more challenging

  • Exercises for gaze instability:

    • In unilateral disorders, goals are to facilitate VOR adaptation and facilitate vestibular-visual interaction

    • In bil vest loss, goals are to facilitate the cervico-ocular reflex through head movements, movements of the body relative to head, compensatory mechanisms, visualization through imagery of targets


Unilateral loss l.jpg
Unilateral loss

  • 1. Maintain focus on a business card taped to wall. Move head side to side and then up and down for two minutes each. Start slowly and inc speed gradually

  • 2. Fixate on an imaginary target in the dark and move head as above while maintaining visual contact on the imaginary target

  • Business card in outstretched hand. Move head and card in opposite directions. Focus on card, increase field


Bil vest loss l.jpg
Bil vest loss

  • Sitting on stool, look at target. Holding the head still, move trunk back and forth for 5 min with eyes open

  • Place 2 cards on the wall so that when looking at one the other can be seen in peripheral vision. Focus on one while either making head mvts or eye mvts to focus on the second card. Eyes should lead head various speeds 5 minutes horizontally and vertically


Slide63 l.jpg


Exercises for positional vertigo l.jpg
Exercises for positional vertigo pt will then imagine the target and keeps focused on the target while turning the head slightly. Pt opens eyes to check for accuracy. 5 minutes horizontally and vertically

  • Find the provoking position and have pt assume that movement until symptoms abate. Latency, duration, and intensity should be documented after each position change. Position changes are done rapidly.

  • Brandt-Doroff

  • Norre-Beckers


Exercises for movement induced vertigo l.jpg
Exercises for movement induced Vertigo pt will then imagine the target and keeps focused on the target while turning the head slightly. Pt opens eyes to check for accuracy. 5 minutes horizontally and vertically

  • Pt repeats movements causing dizziness, varies the velocity from slow to fast, sitting or standing, and with eyes open or closed.

  • Norre-Beckers provoking position


Exercises for postural instability l.jpg
Exercises for Postural Instability pt will then imagine the target and keeps focused on the target while turning the head slightly. Pt opens eyes to check for accuracy. 5 minutes horizontally and vertically

  • Complete loss of vestibular function or hypofunction and have an inability to stand and balance or motor strategy selection problems. At first these patients rely on vision. Amount and speed of perturbation and the size of the BOS are varied.

  • Goal: coordinate appropriate movement strategies within different environmental contexts


Exercises for sensory organization dysfunction l.jpg
Exercises for Sensory Organization Dysfunction pt will then imagine the target and keeps focused on the target while turning the head slightly. Pt opens eyes to check for accuracy. 5 minutes horizontally and vertically

  • SOT problems conditions 2,3 emphasize proprioceptive input WS dec BOS

  • SOT cond. 3,6 Visual preference disorders. Emphasize the use of vestibular and somatosensory input

  • Vestibular dysfunction Diff with 5,6: Emphasize inc. reliance on vestibular inputs by dec vision and somatosensory cues


Exercises for decreased limits of stability l.jpg
Exercises for Decreased Limits of Stability pt will then imagine the target and keeps focused on the target while turning the head slightly. Pt opens eyes to check for accuracy. 5 minutes horizontally and vertically

  • Can be biomechanical or perceptual

  • WS and progress


Exercises for gait instability l.jpg
Exercises for Gait Instability pt will then imagine the target and keeps focused on the target while turning the head slightly. Pt opens eyes to check for accuracy. 5 minutes horizontally and vertically

  • Emphasize dynamic postural stability activities with altered sensory input. Tandem walking, walking on toes/heels, diagonal lines, braiding add head mvts


Fall prevention l.jpg
Fall Prevention pt will then imagine the target and keeps focused on the target while turning the head slightly. Pt opens eyes to check for accuracy. 5 minutes horizontally and vertically

  • Exercises to relieve impairments

  • improve flexibility

  • aerobic conditioning

  • reactive balance training

  • anticipatory balance training

  • dynamic gait activities

  • simulate home environment


Environmental assessment l.jpg
Environmental Assessment pt will then imagine the target and keeps focused on the target while turning the head slightly. Pt opens eyes to check for accuracy. 5 minutes horizontally and vertically

  • Reduce any extrinsic cause

  • Educate your pt. regarding contrast, depth perception, visual acuity, and glare

  • Educate your pt. regarding deficits that can not be altered by balance and mobility training


Conclusion l.jpg
Conclusion pt will then imagine the target and keeps focused on the target while turning the head slightly. Pt opens eyes to check for accuracy. 5 minutes horizontally and vertically


ad