14.3 Vestibular Rehabilitation and Balance Disorders
Key Takeaways
The semicircular canals respond to head rotation. The utricle and saccule respond to linear acceleration and gravity. The vestibulo-ocular reflex helps hold the image steady during head motion.
New continuous dizziness with central findings requires emergency assessment. A trained clinician uses HINTS in acute vestibular syndrome with nystagmus. A single head impulse finding cannot clear a patient for rehabilitation.
The Dix–Hallpike test identifies typical posterior canal BPPV. Use the supine roll test for suspected lateral canal involvement and select repositioning by canal, side and nystagmus pattern.
Head impulses, dynamic visual acuity and foam standing probe different functions. They contribute to the evaluation of hypofunction without individually establishing its cause.
Supervised vestibular rehabilitation for peripheral hypofunction can combine gaze stabilization, substitution, habituation, balance and gait. Select the dose by diagnosis, stage, goals, symptoms and safety.
Vestibular Rehabilitation and Balance Disorders
Begin by establishing when symptoms started, whether they persist at rest, and what brings on a new episode. Someone with seconds of vertigo on rolling in bed needs a different assessment from someone with new continuous dizziness and difficulty walking. In the Saudi Ministry of Health vestibular pathway, clinics use history and bedside assessment to route patients with a suspected central cause to neurology or emergency care and appropriate peripheral cases to vestibular rehabilitation. Suspected acute stroke requires the emergency pathway.
Vestibular Anatomy and Gaze Stability
Each labyrinth has three semicircular canals and two otolith organs. The canal planes are approximately perpendicular to one another and vary between people. During head rotation, endolymph motion relative to the canal deflects the cupula over the crista in its ampulla. Deflection of the hair bundle toward its kinocilium excites the receptor. Deflection away inhibits it. The lateral canals form a functional pair, as do the right anterior and left posterior canals and the left anterior and right posterior canals. A rotation can excite one member of a pair and inhibit the other.
The utricle and saccule detect gravito-inertial acceleration, which includes translational acceleration and the effect of gravity during tilt. Their hair bundles extend into a membrane loaded with calcium carbonate otoconia. The maculae are oriented differently. The utricle is particularly responsive to horizontal acceleration with the head upright, while the saccule is particularly responsive to vertical acceleration.
The angular vestibulo-ocular reflex (VOR) moves the eyes opposite the head when maintaining gaze on a stationary target. In an idealized example, a head turn to the right at 100°/s and eye movement to the left at 100°/s have a gain magnitude of 1.0. Gain depends on the measurement conditions, including the direction and velocity of motion. If the eyes move with the head during a brief impulse, a refixation saccade may return gaze to the target. Video testing can also record saccades that occur during the impulse and are difficult to see at the bedside.
Acute Dizziness and Central Findings
| Pattern or finding | Clinical decision |
|---|---|
| Brief spells brought on by position changes, with no continuous dizziness at rest | Consider a positional cause. Examine the pattern of positional nystagmus when testing is safe. |
| New continuous dizziness with nausea, movement intolerance and new unsteadiness | Consider acute vestibular syndrome. Evaluate urgency from the history, neurological examination and local referral pathway. Head movement can worsen an ongoing syndrome without making it positional BPPV. |
| New diplopia, dysarthria, limb or truncal ataxia, inability to stand unaided, or unusual severe head or neck pain with acute neurological symptoms | Activate emergency assessment for possible stroke or another acute central disorder. Do not delay referral to complete vestibular tests. |
| New unilateral hearing loss with acute continuous dizziness | Escalate for medical assessment. The differential includes a vascular lesion as well as inner-ear disease. |
In acute unilateral peripheral vestibulopathy, spontaneous nystagmus is often direction-fixed, horizontal-torsional and more apparent without visual fixation. A fast phase that reverses direction with lateral gaze, a vertical skew or unexplained vertical nystagmus raises concern for a central cause. Intensity of nausea or spinning and suppression by fixation alone do not settle the cause. Positional nystagmus must be interpreted in its own setting.
HINTS combines head impulse, nystagmus and test of skew. GRACE-3 recommends it for trained clinicians evaluating adults with acute vestibular syndrome and nystagmus in the emergency department. A normal horizontal head impulse in this setting, direction-changing gaze-evoked nystagmus, or vertical refixation on alternate cover testing is concerning for a central cause. Some strokes can also produce a corrective saccade on head impulse. The guideline adds a bedside hearing check and uses MRI to investigate a central or equivocal result. When there is no nystagmus, the severity of gait unsteadiness helps guide assessment. In a rehabilitation setting, use the emergency referral pathway for suspected stroke, including concerning presentations when a trained examiner is unavailable.
Positional Vertigo and Repositioning
In canalithiasis, free particles move in a canal when its orientation to gravity changes and transiently deflect the cupula. In cupulolithiasis, particles on the cupula can make it sensitive to gravity and produce a longer response. Latency and duration help describe the pattern. The direction and position that provokes the nystagmus, the history and other examination findings also matter.
Before a head impulse, positional examination or repositioning, check whether the required head motion is safe. Suspected cervical instability, serious cervical trauma or an acute vascular or neurological disorder calls for withholding the provoking maneuver and arranging appropriate medical assessment. A provocative vertebral artery position cannot clear the patient. If limited cervical motion is the only barrier and posterior canal testing is otherwise appropriate, use a supported side-lying alternative or refer for an adapted examination.
Select the Test and Interpret the Pattern
| Test and pattern | Interpretation and action |
|---|---|
| Dix–Hallpike with brief torsional upbeating nystagmus, upper eye poles beating toward the dependent ear | Typical posterior canal BPPV on the tested side. From sitting, turn the head about 45° toward that ear and support the patient into supine with about 20° of neck extension. Observe the eyes and the symptoms. Test the other side when indicated and safe. |
| Compatible history with horizontal or absent nystagmus on Dix–Hallpike | Perform or refer for the supine roll test. In supine with about 30° head flexion, turn toward each side in sequence and compare the direction, intensity and duration of the response. |
| Horizontal nystagmus beating toward the ground in both roll positions | Geotropic lateral canal pattern. In a typical asymmetric presentation, the stronger nystagmus is on the involved side. The pattern commonly reflects free particles in the lateral canal. |
| Horizontal nystagmus beating away from the ground in both roll positions | Apogeotropic lateral canal pattern. The weaker side often corresponds to the affected ear. Particles attached to the cupula or debris in the anterior arm can give this pattern. Seek further assessment if the side or mechanism is uncertain. |
| Downbeat or other atypical positional nystagmus | Anterior canal BPPV can have a torsional downbeat pattern, but central causes can mimic it. An atypical pattern warrants appropriate further assessment before a routine maneuver. |
Match Treatment to the Pattern
- Typical posterior canal BPPV. Use or refer for a canalith repositioning procedure such as the Epley maneuver. Start in the supported affected-side test position, turn the head toward the opposite side, roll toward that side with the nose angled down, then assist the patient back to sitting. Use the selected protocol's positions and holds. Semont is another studied posterior canal maneuver. Positioning depends on the patient's neck, mobility and tolerance.
- Geotropic lateral canal BPPV. A barbecue roll turns the patient in stages away from the affected side to move debris through the lateral canal. A geotropic Gufoni maneuver is also supported by randomized trial evidence. If a patient cannot safely roll through the positions, select a suitable alternative or refer.
- Apogeotropic lateral canal pattern. Use a maneuver matched to this variant and the established side. A Gufoni–Appiani variant is one studied approach. Re-examine the response, since the pattern can convert and require a different maneuver.
The AAO-HNS guideline advises reassessment within one month after initial observation or treatment and further evaluation when symptoms persist. Discuss recurrence, safe mobility and when to seek help. Persistent positional vertigo can reflect unresolved BPPV or another vestibular or central disorder.
Unilateral and Bilateral Vestibular Hypofunction
Unilateral hypofunction can follow acute unilateral vestibulopathy or vestibular nerve surgery. An acute unilateral loss can produce continuous vertigo and spontaneous nystagmus, with the fast phase usually beating away from the reduced-function side in the acute stage. New auditory symptoms or central findings change the differential. Catch-up saccades consistently elicited by impulses toward one side support unilateral dysfunction when the history and examination are consistent. Vestibular neuritis is a clinical diagnosis with defined criteria. A single positive test cannot establish the cause.
Bilateral vestibulopathy often presents with unsteadiness while walking, worse in darkness or on uneven ground, and sometimes with oscillopsia during head motion. Ototoxic medication such as gentamicin is one possible cause. Bilateral head impulse abnormalities support the clinical suspicion. The Bárány Society criteria include objective loss of bilateral angular VOR function. One route is horizontal video head impulse gain below 0.6 on both sides at the specified test velocities. Caloric or rotation testing can establish the loss in other frequency ranges under their own criteria.
| Test | What it measures and how to interpret it |
|---|---|
| Head impulse | Observe refixation saccades during or after a rapid, small head turn. Video head impulse quantifies the response and detects saccades that are difficult to observe. Choose the test only when head motion is safe. |
| Dynamic visual acuity | Compare visual acuity with the head stationary and during motion under a defined protocol. For example, 0.00 logMAR at rest and 0.30 during movement is a worsening of 0.30 logMAR, or three 0.10-logMAR lines on an equal-step chart. The result describes functional gaze stability and does not localize the cause on its own. |
| Modified Clinical Test of Sensory Interaction on Balance (mCTSIB) | Compare firm and foam standing with eyes open and closed. In condition 4, eye closure removes visual cues and foam changes the reliability of surface cues. Poor performance can indicate difficulty when vestibular information becomes more important. It is a functional balance finding, and the Saudi pathway lists computerized posturography as a follow-up for abnormal performance. Guard against falls. |
Exercise Selection and Dose
| Approach | Application |
|---|---|
| Adaptation and gaze stabilization | In VOR ×1, move the head while keeping a stationary target in focus. In VOR ×2, move the head and target in opposite directions. Choose a speed that permits a clear target and safe performance. Progress speed, position, background or task based on response. Retinal image slip provides an error signal, but functional improvement can reflect multiple compensatory mechanisms. |
| Substitution | Practice coordinated eye and head movements between targets or use available visual and somatosensory cues during mobility. These approaches can help when vestibular function is reduced. Isolated eye movements without head movement are not prescribed as gaze stabilization for hypofunction. |
| Habituation | Repeat a relevant motion or visual task that produces manageable symptoms, adjusting the dose as the response changes. The Motion Sensitivity Test can record symptom intensity and duration across standardized position changes when testing is appropriate. Check the cause of symptoms first and avoid provoking acute neurological symptoms or using habituation in place of an indicated BPPV maneuver. |
| Balance and gait | Practice tasks affected in daily life, such as walking with head turns. Vary supports and task demands with suitable guarding. Reassess symptoms, gait and the activity the patient wants to regain. |
The 2022 APTA vestibular hypofunction guideline recommends supervised rehabilitation. Its recommendations on gaze stabilization dose are weak. With follow-up and a home program, it suggests at least 12 total minutes daily across at least three bouts for acute or subacute unilateral hypofunction. For chronic unilateral hypofunction it suggests at least 20 total minutes daily across three to five bouts for four to six weeks. For bilateral hypofunction it suggests 20–40 total minutes daily across three to five bouts for about five to seven weeks. These are condition-specific guidance for total daily gaze exercise, with individual progression. They do not prescribe a universal metronome speed or the length of a clinic appointment.
Worked Clinical Decision
A patient was evaluated medically for a new acute vestibular syndrome. Acute central causes have been assessed, and the working diagnosis is right acute unilateral vestibulopathy. Four days later, the main limitation is blurry vision when turning the head while walking. A refixation saccade after a rightward head impulse and worse acuity during head motion support the functional deficit. Record the acuity change with the same chart and movement protocol at follow-up. Select supported VOR ×1 practice and guarded walking with head turns, progressing one demand at a time. If the patient develops new diplopia, new focal signs or sudden severe unsteadiness, stop and reassess through the emergency pathway. When gait improves, verify that the patient can scan for traffic and turn safely outdoors before advancing that goal.
An adult develops continuous dizziness and unsteadiness over 24 hours. A trained examiner observes spontaneous nystagmus. Which additional finding warrants emergency evaluation for a central cause?
Direction-fixed horizontal-torsional nystagmus throughout lateral gaze
Nausea that increases when the patient moves the head
Nystagmus beating right on right gaze and left on left gaze
Transient blurring during head turns without a change in nystagmus
A patient reports brief vertigo on rolling over. The supine roll test evokes horizontal nystagmus toward the floor in both positions, clearly stronger with the right ear down. Which interpretation and treatment are appropriate?
Left geotropic lateral canal BPPV, treated with a lateral repositioning maneuver
Right posterior canal BPPV, treated with the Epley maneuver
Right apogeotropic lateral canal BPPV, treated with an apogeotropic maneuver
Right geotropic lateral canal BPPV, for which a barbecue roll is a suitable option
A patient with confirmed bilateral vestibular hypofunction reports that walking in the dark on uneven ground is especially difficult. Which mCTSIB condition most closely reproduces the sensory challenge?
Foam surface, eyes closed
Firm surface, eyes open
Firm surface, eyes closed
Foam surface, eyes open
A patient with unilateral vestibular hypofunction holds a letter on the wall in focus while turning the head side to side. Which exercise is this?
VOR ×2 viewing
VOR ×1 viewing
Alternating eye-head movements between two targets
Positional habituation without a gaze task
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