Vestibular rehabilitation

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Diagram of the vestibular system, the structures whose dysfunction can benefit from vestibular rehabilitation VestibularSystem la.png
Diagram of the vestibular system, the structures whose dysfunction can benefit from vestibular rehabilitation

Vestibular rehabilitation (VR), also known as vestibular rehabilitation therapy (VRT), is a specialized form of physical therapy used to treat vestibular disorders or symptoms, characterized by dizziness, vertigo, and trouble with balance, posture, and vision. These primary symptoms can result in secondary symptoms such as nausea, fatigue, and lack of concentration. All symptoms of vestibular dysfunction can significantly decrease quality of life, introducing mental-emotional issues such as anxiety and depression, and greatly impair an individual, causing them to become more sedentary. Decreased mobility results in weaker muscles, less flexible joints, and worsened stamina, as well as decreased social and occupational activity. Vestibular rehabilitation therapy can be used in conjunction with cognitive behavioral therapy in order to reduce anxiety and depression resulting from an individual's change in lifestyle. [1] [2] However, there is often confusion about whether vestibular rehabilitation falls under physical therapy (PT) or occupational therapy (OT). [3]

Contents

Vestibular disorders

Vestibular disorders, encompassing conditions that affect the inner ear and vestibular system, can disrupt one’s balance and quality of life. Vestibular rehabilitation, a specialized therapy, plays a crucial role in addressing these issues. [4]

The term "vestibular" refers to the inner ear system with its fluid-filled canals that allow for balance and spatial orientation. Some common vestibular disorders include vestibular neuritis, Ménière's disease, and nerve compression. Vestibular dysfunction can exist unilaterally, affecting only one side of the body, or bilaterally, affecting both sides. [2]

The most commonly known vestibular disorder is called Benign Paroxysmal Positional Vertigo (BPPV). The BPPV is characterized by a temporary dizzy feeling associated with blurred vision in relation to certain head positions. BPPV may affect anterior, posterior or horizontal vestibular canals. The posterior canal was reported in the literature as the most commonly affected canal, occurring in 80% of patients diagnosed with BPPV. Several positional tests such as Hall-bike dix test, supine roll test, and head shaking nystagmus test may indicate which canal is affected by BPPV. [5]

Vestibular damage is often irreparable and symptoms are persistent. Although the body naturally compensates for vestibular dysfunction (as it does for the dysfunction or deficiency of any sense), vestibular rehabilitation furthers the compensation process to decrease both primary and secondary symptoms. In cases of chronic vestibular dysfunction, medication in the form of vestibular suppressants does not allow the nervous system to undergo compensation. Thus, long-term medication is not a viable option for individuals with chronic vestibular dysfunction. Because of this, vestibular rehabilitation therapy is a better alternative for long-term vestibular dysfunction. However, some medications, such as anticholinergics, antihistamines, and benzodiazepines, are useful in acute cases (of 5 days or less) for reducing nausea and other secondary symptoms. [6]

Diagnostic tests

Because the methods of vestibular rehabilitation therapy differ for different disorders, the form of vestibular dysfunction, ability level, and history of symptoms, each patient must be carefully assessed in order to diagnose vestibular dysfunction and to choose the correct exercises for treatment. In some cases, vestibular rehabilitation may not be the appropriate treatment at all. Vestibular disorders can be diagnosed using several different kinds of assessments, some of which include examination of an individual's ability to maintain posture, balance, and head position. Some diagnostic tests are more easily performed in a clinical setting than others but relay less specific information to the tester, and vice versa. A proper history of symptoms should include what those symptoms are, how often they occur, and under what circumstances, including whether the symptoms are triggered or spontaneous. [2] Other conditions that can be treated with vestibular rehabilitation therapy are symptoms of concussions [7] and dizziness in patients with multiple sclerosis. [8] Magnetic resonance imaging techniques can be used as diagnostic tools to determine the presence of issues that can be treated with vestibular rehabilitation, regardless of whether they are vestibular in nature.

Caloric reflex test

The caloric reflex test is designed to test the function of the vestibular system and can determine the cause of vestibular symptoms. The reflex test consists of pouring water into the external auditory canal of a patient and observing nystagmus, or involuntary eye movement. With normal vestibular function, the temperature of the water has an effect on the direction of eye movement. In individuals with peripheral unilateral vestibular hypofunction, nystagmus is absent. [2]

Rotational chair testing

This test is used to test bilateral vestibular hypofunction and the degree of central nervous system (CNS) compensating those results. Movement of fluid within the inner ear, known as endolymph, is responsible for the relationship between eye movement and head velocity. The test consists of seating a patient in a rotating chair, rotating the chair to specific velocity, and observing eye movement. In individuals with normal vestibular function, the velocity of eye movement should be equal and opposite that of head movement. Lower rotational velocities are used to assess extent of CNS compensation. [2]

Visual perception testing

Visual perception testing can assess a patient's ability to determine vertically- and horizontally-oriented objects, but with a limited degree of specificity. When asked to align a bar to horizontal or vertical, an individual with normal vestibular function can align the bar within 2.5 degrees of horizontal or vertical. An inability to do so indicates vestibular dysfunction. In some cases, the direction of tilt away from the desired orientation is on the same side as the dysfunction, while in some cases the opposite is true. [2]

Posturography

Using various technologies to assess a person's ability to maintain posture and balance, different patterns of posturography can be determined. Once a pattern is determined, the modalities and inputs that the person relies on to maintain balance can be inferred. Knowing which systems and structures influence a person's stance can suggest different areas of dysfunction and preference. [2]

Non-vestibular dizziness

In some cases, the results of vestibular tests are normal, yet the patient experiences vestibular symptoms, especially balance issues and dangerous falls. Some diagnoses that result in non-vestibular dizziness are concussions, Parkinson's disease, cerebellar ataxia, normal-pressure hydrocephalus, leukoaraiosis, progressive supranuclear palsy, and large-fiber peripheral neuropathy. There are also several disorders known as chronic situation-related dizziness disorders. For example, phobic postural vertigo (PPV) occurs when an individual with obsessive-compulsive characteristics experiences a sense of imbalance, despite the absence of balance issues. Chronic subjective dizziness (CSD) is a similar condition characterized by persistent vertigo, hypersensitivity to motion stimuli, and difficulty with precise visual tasks. Both phobic postural vertigo and chronic subjective dizziness may be treated with vestibular rehabilitation therapy or other therapeutic methods such as cognitive behavioral therapy and conditioning. [2]

Rehabilitation exercises

Vestibular rehabilitation is specific to the dysfunction that a patient experiences. Some treatment methods seek to eliminate the cause of vestibular dysfunction, while others allow the brain to compensate for dysfunction without targeting the source. The former goal is for treating benign paroxysmal positional vertigo, while the latter treats vestibular hypofunction, which cannot be cured. The treatment process should begin as early as possible, to decrease fall risk. The patient should start slowly, gradually increasing the intensity and duration of exercises, and be accompanied by an accessible and reassuring therapist, as discomfort and negative emotional states can negatively affect treatment. [2]

Treatment of benign paroxysmal positional vertigo

Treatment of benign paroxysmal positional vertigo (BPPV) depends on the canals involved (horizontal or vertical) and which form of BPPV the patient is experiencing (canalithiasis versus cupulolithiasis). Canalithiasis is characterized by a dislodged otolith particle, called otoconia, that floats in the fluid in one of the three vestibular canals and cause the feeling of dizziness with vision disturbances. On the other hand, cupulolithiasis is another form of BPPV caused by an attachment of otolith particle in the cupula (the base of semicircular canal) of the involved canal. [5]

Canalith repositioning treatments

Canalith repositioning treatments (CRT) aim to move debris in the inner ear out of the semicircular canal in order to treat benign paroxysmal positional vertigo. CRT has 5 key elements:

  1. Premedication of the patient
  2. Specific positions
  3. Timing of shifts between positions
  4. Use of vibration
  5. Post-maneuver instructions

Early attempts to treat BPPV involved similar processes that were believed to be habituation exercises, but more likely dislodged and dissolved debris. [2]

Treatment of vestibular hypofunction

Vestibular hypofunction can be a unilateral or bilateral vestibular loss. There are three types of vestibular rehabilitation exercises to reduce symptoms in cases where physical dysfunction cannot be reduced. The category of exercises chosen by a vestibular therapist depends on the problems reported by the patient. The following exercises can be used to treat dizziness with fast movements or exposure to intense visual stimuli, difficulty seeing (appearance of bouncing or jumping visual field) with head movement, and trouble with balance. [1]

Habituation

Habituation exercise aims to repeatedly expose patients to stimuli that provoke dizziness, such as certain motions and harsh visual stimuli. The provoking stimulus will induce dizziness at first, but with continued habituation exercises, the brain can adapt to discount the stimulus and dizziness will reduce. As this occurs, the exercises can increase in intensity. The patient should take breaks between exercises when symptoms are experienced, until they stop. [2]

Gaze stabilization

Gaze stabilization exercises aim to increase visual ability during head movement. [1] The goal of the patient during these exercises is to maintain the gaze during head movement. One kind of gaze stabilization exercise involves looking at a target and moving the head back and forth, without looking away from the target. Another exercise requires looking from one target to another, first without moving the head, and then moving the head to be aligned with the target without shifting the eyes. The last exercise for gaze stabilization is known as the remembered-target exercise and is performed partially with the eyes closed. First, the patient looks at a target object directly in front of them. Next, the patient closes their eyes and turns their head and turns it back. When the patient opens their eyes, they should still be looking at the target object. [2]

Balance training

Balance-training exercises (also known as postural-stabilization exercises) are designed to improve a patient's ability to stay upright, and reduce the likelihood of dangerous falls. [1] Exercises such as sitting to standing, and gait training with a focal point in increasing trunk control can play a crucial role in enhancing balance and stability of the core and posture which are critical components in improving the challenges that individuals with vestibular disorders may face. Subsequently, improving vestibular reflexes are important in daily activities such as walking down the stairs, and getting out of bed. [9] Balance-training exercises can be done walking or standing and can incorporate head movements and habituation exercises to limit exacerbation of symptoms. Increased postural stability can be achieved using visual and somatosensory cues. Thus, exercises in this category challenge the body's use of these cues by limiting or changing them. For example, having the patient close their eyes limits their ability to rely on visual cues to maintain postural stability, while having the patient stand on foam alters their reliance on somatosensory signals. [2]

Effectiveness

The limitations of vestibular rehabilitation therapy is for the overall health and function of the nervous system, especially the brainstem, cerebellum, and visual and somatosensory centers. [1] The ultimate goal of vestibular rehabilitation therapy is for the reduction of vertigo, dizziness, gaze instability, poor balance, and dangerous falls; in some cases this goal is achieved without reducing dysfunction.

Vestibular rehabilitation is regarded as an effective therapeutic technique for individuals with vestibular dysfunction; it serves as a low-cost, and safe therapeutic strategy that could be extensively employed in outpatient clinics without the need for complex tools. [9] Studies indicate that balance exercises can improve stability by restoring neural synapses and activating astrocytes to improve motor coordination. Factors such as assessment methods, strategies, dosing, and patient participation can greatly influence the effectiveness of vestibular rehabilitation. Incorporating new technologies such as virtual reality, mobile applications, and enhanced sensory bionics may improve personalized vestibular rehabilitation for central vestibular dysfunction. [10]

There are many factors that can affect the outcome of vestibular therapy including but not limited to age, gender, environmental factors, medical history as well as other facets of the patient's daily life. A major aspect that can impede progress during vestibular therapy is an altered mental status, this can include depression, anxiety or even fear. If a patient is afraid of falling or even moving that can negatively impact the effectiveness of the treatment. Another major factor is other medical conditions the patient may have in addition to the vestibular disorder, if they also have a musculoskeletal disorder they may not be able to perform all the movements required during the treatment session therefore having a negative impact on their outcome. [11] Other factors that determine the effectiveness of vestibular rehabilitation are behavioral ones, such as patient compliance to home exercises and limitations in daily life; the severity of the disorder (including unilateral versus bilateral dysfunction); and other medical conditions and medications. [1] Those comorbidities may also require the patient to take medications that may have adverse side effects that may also impact the vestibular rehab so it is very important for the patient to check with their doctor as well as their vestibular therapist before starting or stopping any medication. A factor that can positively affect the outcome is starting the therapy as soon as possible, one study found that early intervention in patients with unilateral peripheral disorders correlated to a significantly lower Dizziness Handicap Inventory (DHI) score. [11] Research has shown that, overall, 80 to 85 percent of patients with chronic vestibular disability reported a reduction in symptoms after VR. [12]

There is evidence that vestibular rehabilitation therapy increases the "balance, quality of life, and functional capacity" of patients with multiple sclerosis. [8]

In a study of 109 children, an association between completion of vestibular rehabilitation and improvement of concussion symptoms and visuovestibular performance was found. A different study found that vestibular and physical therapy were linked to a shorter recovery period, resulting in a more rapid return to sports. [7] A 2018 meta-analysis utilized the DHI to evaluate the effects of vestibular therapy on the alleviation of concussion symptoms. [13] The DHI is a 25-item questionnaire that is a cost-effective and simple tool that has the ability to analyze the effects of vestibular therapy on concussion symptoms. [13] The lower the DHI, the less symptomatic a patient is and a decrease of 18 points or more from pre to post vestibular therapy intervention is considered clinically significant. [13] All of the studies evaluated in the meta-analysis had clinically significant changes in DHI pre to post vestibular therapy, illustrating the positive effects of vestibular therapy on the treatment and alleviation of concussion symptoms. [13]

Training and certification

Vestibular rehabilitation can be facilitated by a medical professional who specializes in neurology or vestibular disorders. An official specialist certification is not required, and in many places, is not offered. The leading association of physical therapists in each country determines what disciplines have specialization status and the requirements of an individual to obtain certification in a speciality.

In the US

Members of the American Physical Therapy Association (APTA) who undergo specialist certification in neurology via the American Board of Physical Therapy Specialties (ABPTS) can administer vestibular rehabilitation exercises. [14] While APTA does not offer official certification in vestibular rehabilitation, it does offer courses regarding vestibular rehabilitation at introductory and advanced levels. The Academy of Neurologic Physical Therapy and the Vestibular Rehabilitation Special Interest Group are working to have the APTA establish VR as an official specialty offered by the ABPTS. [15]

The American Musculoskeletal Institute (AMSI) offers a 3-day course that results in a therapist being designated a Certified Vestibular Rehabilitation Specialist (Cert. VRS). [16]

Members of the American Occupational Therapy Association (AOTA) who obtain specialty certification in low-vision rehabilitation are equipped to treat vision issues that arise from vestibular dysfunction or disorders. [17]

In Canada

The Canadian Physiotherapy Association offers vestibular rehabilitation therapy courses, but does not recognize vestibular rehabilitation as a specialist certification. Similar to the ABPTS, the CPA's Clinical Specialty Program allows Canadian physiotherapists to specialize in neurosciences. Physical therapists with this specialization may be more equipped to administer vestibular treatment than those without it. [18]

See also

Related Research Articles

<span class="mw-page-title-main">Ménière's disease</span> Disorder of the inner ear

Ménière's disease (MD) is a disease of the inner ear that is characterized by potentially severe and incapacitating episodes of vertigo, tinnitus, hearing loss, and a feeling of fullness in the ear. Typically, only one ear is affected initially, but over time, both ears may become involved. Episodes generally last from 20 minutes to a few hours. The time between episodes varies. The hearing loss and ringing in the ears can become constant over time.

A balance disorder is a disturbance that causes an individual to feel unsteady, for example when standing or walking. It may be accompanied by feelings of giddiness, or wooziness, or having a sensation of movement, spinning, or floating. Balance is the result of several body systems working together: the visual system (eyes), vestibular system (ears) and proprioception. Degeneration or loss of function in any of these systems can lead to balance deficits.

<span class="mw-page-title-main">Vestibular system</span> Sensory system that facilitates body balance

The vestibular system, in vertebrates, is a sensory system that creates the sense of balance and spatial orientation for the purpose of coordinating movement with balance. Together with the cochlea, a part of the auditory system, it constitutes the labyrinth of the inner ear in most mammals.

<span class="mw-page-title-main">Dizziness</span> Neurological condition causing impairment in spatial perception and stability

Dizziness is an imprecise term that can refer to a sense of disorientation in space, vertigo, or lightheadedness. It can also refer to disequilibrium or a non-specific feeling, such as giddiness or foolishness.

<span class="mw-page-title-main">Labyrinthitis</span> Medical condition

Labyrinthitis is inflammation of the labyrinth, a maze of fluid-filled channels in the inner ear. Vestibular neuritis is inflammation of the vestibular nerve. Both conditions involve inflammation of the inner ear. Labyrinths that house the vestibular system sense changes in the head's position or the head's motion. Inflammation of these inner ear parts results in a sensation of the world spinning and also possible hearing loss or ringing in the ears. It can occur as a single attack, a series of attacks, or a persistent condition that diminishes over three to six weeks. It may be associated with nausea, vomiting, and eye nystagmus.

<span class="mw-page-title-main">Benign paroxysmal positional vertigo</span> Medical condition

Benign paroxysmal positional vertigo (BPPV) is a disorder arising from a problem in the inner ear. Symptoms are repeated, brief periods of vertigo with movement, characterized by a spinning sensation upon changes in the position of the head. This can occur with turning in bed or changing position. Each episode of vertigo typically lasts less than one minute. Nausea is commonly associated. BPPV is one of the most common causes of vertigo.

<span class="mw-page-title-main">Electronystagmography</span>

Electronystagmography (ENG) is a diagnostic test to record involuntary movements of the eye caused by a condition known as nystagmus. It can also be used to diagnose the cause of vertigo, dizziness or balance dysfunction by testing the vestibular system. Electronystagmography is used to assess voluntary and involuntary eye movements. It evaluates the cochlear nerve and the oculomotor nerve. The ENG can be used to determine the origin of various eye and ear disorders.

<span class="mw-page-title-main">Vertigo</span> Type of dizziness where a person has the sensation of moving or surrounding objects moving

Vertigo is a condition in which a person has the sensation of movement or of surrounding objects moving when they are not. Often it feels like a spinning or swaying movement. It may be associated with nausea, vomiting, perspiration, or difficulties walking. It is typically worse when the head is moved. Vertigo is the most common type of dizziness.

<span class="mw-page-title-main">Vestibular nerve</span> Branch of the vestibulocochlear nerve

The vestibular nerve is one of the two branches of the vestibulocochlear nerve. In humans the vestibular nerve transmits sensory information transmitted by vestibular hair cells located in the two otolith organs and the three semicircular canals via the vestibular ganglion of Scarpa. Information from the otolith organs reflects gravity and linear accelerations of the head. Information from the semicircular canals reflects rotational movement of the head. Both are necessary for the sensation of body position and gaze stability in relation to a moving environment.

Post-concussion syndrome (PCS), also known as persisting symptoms after concussion, is a set of symptoms that may continue for weeks, months, years after a concussion. PCS is medically classified as a mild traumatic brain injury (TBI). About 35% of people with concussion experience persistent or prolonged symptoms 3 to 6 months after injury. Prolonged concussion is defined as having concussion symptoms for over four weeks following the first accident in youth and for weeks or months in adults.

The Dix–Hallpike or Nylén–Bárány test is a diagnostic maneuver from the group of rotation tests used to identify benign paroxysmal positional vertigo (BPPV).

<span class="mw-page-title-main">DizzyFIX</span>

The DizzyFIX is a home medical device designed to assist in the treatment of benign paroxysmal positional vertigo (BPPV) and its associated vertigo. The device is a head-worn representation of semi-circular canals. The device is filled with fluid and a particle representing the otoconia associated with BPPV. The device works like a visual set of instructions and guides the user through the treatment maneuver for BPPV. This maneuver is called the particle repositioning maneuver or Epley maneuver.

The Epley maneuver or repositioning maneuver is a maneuver used by medical professionals to treat one common cause of vertigo, benign paroxysmal positional vertigo (BPPV) of the posterior or anterior canals of the ear. The maneuver works by allowing free-floating particles, displaced otoconia, from the affected semicircular canal to be relocated by using gravity, back into the utricle, where they can no longer stimulate the cupula, therefore relieving the patient of bothersome vertigo. The maneuver was developed by the physician, John M. Epley, and was first described in 1980.

<span class="mw-page-title-main">Nystagmus</span> Dysfunction of eye movement

Nystagmus is a condition of involuntary eye movement. People can be born with it but more commonly acquire it in infancy or later in life. In many cases it may result in reduced or limited vision.

Vestibular migraine (VM) is vertigo with migraine, either as a symptom of migraine or as a related neurological disorder.

Videonystagmography (VNG) is a technology for testing inner ear and central motor functions, a process known as vestibular assessment. It involves the use of infrared goggles to trace eye movements during visual stimulation and positional changes. VNG can determine whether dizziness is caused by inner ear disease, particularly benign paroxysmal positional vertigo (BPPV), as opposed to some other cause such as low blood pressure or anxiety.

Vertiginous epilepsy is infrequently the first symptom of a seizure, characterized by a feeling of vertigo. When it occurs, there is a sensation of rotation or movement that lasts for a few seconds before full seizure activity. While the specific causes of this disease are speculative there are several methods for diagnosis, the most important being the patient's recall of episodes. Most times, those diagnosed with vertiginous seizures are left to self-manage their symptoms or are able to use anti-epileptic medication to dampen the severity of their symptoms.

The righting reflex, also known as the labyrinthine righting reflex, is a reflex that corrects the orientation of the body when it is taken out of its normal upright position. It is initiated by the vestibular system, which detects that the body is not erect and causes the head to move back into position as the rest of the body follows. The perception of head movement involves the body sensing linear acceleration or the force of gravity through the otoliths, and angular acceleration through the semicircular canals. The reflex uses a combination of visual system inputs, vestibular inputs, and somatosensory inputs to make postural adjustments when the body becomes displaced from its normal vertical position. These inputs are used to create what is called an efference copy. This means that the brain makes comparisons in the cerebellum between expected posture and perceived posture, and corrects for the difference. The reflex takes 6 or 7 weeks to perfect, but can be affected by various types of balance disorders.

The term chronic subjective dizziness (CSD) is used to describe a commonly encountered type of dizziness that is not easily categorized into one of several other types, and for which the physical examination is typically normal. Patients with CSD frequently initially suffer a sudden injury of some sort to their vestibular system, the neurologic network that preserves sense of balance. Even after this initial injury has healed, people with CSD usually describe a vague sense of unsteadiness worsened by triggers in their environment such as high places, standing on moving objects, or standing in motion-rich environments like busy streets or crowds. There is a clear indication that anxiety and other mental illnesses play a role in the dizziness symptoms that occur with CSD. However, the condition is categorized as chronic functional vestibular disorder, not as a structural or psychiatric condition.

<span class="mw-page-title-main">Anita Bhandari</span> Indian surgeon

Anita Bhandari is an Indian neurotologist, otorhinolaryngologist, entrepreneur and author based in Jaipur. She is the co-founder and director of NeuroEquilibrium, which has set up over 175 dizziness and balance disorder clinics in India and abroad.

References

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