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Understanding Acute Unilateral Vestibulopathy (Vestibular Neuritis)

Updated: Feb 18



Acute Unilateral Vestibulopathy (AUVP), also called vestibular neuritis, is an acute peripheral vestibular syndrome defined by an acute unilateral loss of peripheral vestibular function without evidence for acute central neurological or acute audiological symptoms or signs. The Bárány Society* has established formal diagnostic criteria for Acute Unilateral Vestibulopathy (AUVP), also known as Vestibular Neuritis.

*The Bárány Society is the leading international, interdisciplinary organization for scientists and clinicians (neurologists, otolaryngologists) focused on vestibular research, diagnostics, and treatment. It establishes global standards for diagnosing vestibular disorders, defines disease criteria through its International Classification of Vestibular Disorders (ICVD), and provides educational resources via the Vestibular Medicine Curriculum (VestMed). 


For a definite diagnosis of Vestibular Neuritis, the patient meets all six criteria listed below perfectly. However, this criteria considers Vestibular Neuritis/AUVP in Evolution if symptoms have been there for more than three hours but they haven't reached the 24-hour mark yet. Additionally,  a probable diagnosis of Vestibular Neuritis/AUVP is where most of the criteria are met however there is no clear evidence on impaired VOR(Vestibular Ocular reflex) function. 


Think of it as a process of confirming an inner-ear "power failure" on one side while making sure the brain and hearing are unaffected.


Below is a simple breakdown of the diagnostic criteria that a health provider  would consider when diagnosing someone with Vestibular Neuritis/AUVP.  


Criterion


A. Sudden & Long-Lasting

The dizziness must start suddenly (or over a few hours) and be a constant spinning or swaying feeling. It must be moderate to severe in intensity and last for at least 24 hours.

B. Specific Eye Twitches

Your provider will look for Nystagmus (involuntary eye rhythmic movements) by utilizing specialized infra red goggles.  In AUVP, the eyes usually jump horizontally and twist slightly, always in the same direction. 

C. Weak Vestibulo-Ocular Reflex (VOR)

There must be clear proof that the Vestibulo-Ocular Reflex (VOR)—the "internal stabilizer" that keeps your vision clear when your head moves—is weak on one side. A head impulse test is utilized to check this. 

D. No "Brain" or "Hearing" Symptoms

You should not have new double vision, slurred speech, numbness, or any new hearing loss or ringing in the ears (tinnitus). This helps rule out a stroke or Meniere’s disease.

E. No "Brain" or "Hearing" Signs

During a physical exam, there should be no signs of brain-related issues, such as eyes being vertically misaligned (skew deviation) or hearing loss on a bedside test.

F. Nothing Else Fits Better

It is important that no other condition (like a vestibular migraine or a different ear disorder) better explains your symptoms.

How Common is Vestibular Neuritis (AUVP)?


  • It is a frequent cause of dizziness: Out of dozens of possible reasons for vertigo, this condition is the 6th most common cause overall. If we only look at inner-ear issues, it ranks 3rd (behind "the crystals" or BPPV, and Meniere’s disease).

  • Who gets it? It most often starts between the ages of 30 and 60, peaking in your 40s. It affects men and women equally, and it doesn't seem to matter what season of the year it is.

  • Can it happen to kids? Yes, though it’s less common than in adults, it is still the 3rd leading inner-ear cause of dizziness in children.

Will It Come Back?

The good news is that for most people, this is a one-time event. Studies show the recurrence rate is quite low—usually somewhere between 2% and 10%.

Related Challenges to Watch For

Sometimes, one vestibular problem can lead to another. There are two specific things to keep an eye on:

The "Crystals" (BPPV): Some people who have had vestibular neuritis later develop BPPV (where tiny calcium crystals in the ear get loose). This happens because the initial inflammation can make those crystals more likely to slide out of place.

Functional Dizziness (Persistent Postural Perceptual Dizziness) : Because vestibular neuritis is such a "shock" to the system, it is the 3rd most common trigger for a secondary type of dizziness where the brain stays on "high alert" even after the initial nerve inflammation has calmed down. A specialized vestibular therapist is essential because their advanced clinical expertise ensures treatment is precisely calibrated to facilitate early vestibular compensation, effectively mitigating the risk of maladaptive neuroplasticity and the development of secondary complications such as Functional Dizziness (PPPD).


Recovering from AUV/vestibular Neuritis


Key Early Medications (1-3 days)

  • Corticosteroids: Timing: Steroids are most effective when started within 24-48 hours.

  • Vestibular Suppressants (For Dizziness/Vertigo):

  • Antiemetics (For Nausea/Vomiting): Promethazine or ondansetron .

Important Guidelines

Short-Term Use: Vestibular suppressants (meclizine, diazepam) should generally be used for no more than 3 days, as they can hinder long-term compensation by the brain.

Prioritizing Early Intervention:

Vestibular Rehabilitation Therapy (VRT) is a specialized form of physical therapy designed to retrain the brain to process signals from the inner ear correctly. It uses specific head, body, and eye exercises to strengthen the "stabilization system" that keeps your vision clear and your footing steady when you move.

The evidence for vestibular rehabilitation therapy (VRT) in facilitating central compensation is strong and well-established, particularly through the lens of neuroplasticity. Central compensation is the brain's ability to recalibrate itself after the peripheral vestibular system (the inner ear) is affected. 


Key Evidence and Clinical Guidelines:

  • Cochrane Reviews & Clinical Practice Guidelines (CPG): There is "Level I" evidence (the gold standard) supporting VRT for unilateral vestibular hypofunction. Research shows that patients who perform VRT improve significantly faster and more completely than those who simply wait or take medication (like meclizine), which can actually delay compensation.

  • The "Critical Window": Evidence suggests that early intervention is superior. While the brain can compensate years after an injury, initiating VRT in the acute or sub-acute phase leverages the brain's natural post-injury plasticity.

  • The Role of Movement: Compensation is a "movement-dependent" process. The brain cannot recalibrate if the patient remains sedentary. Static exercises are less effective than those involving head movement and gait.

The Three Pillars of Compensation:

The brain doesn't just "get used to" dizziness; it uses three specific neurological mechanisms that VRT is designed to trigger:

  • Adaptation: The brain (specifically the cerebellum) adjusts the "gain" of the Vestibulo-Ocular Reflex (VOR). This reduces retinal slip (blurred vision when the head moves).

  • Substitution: The brain begins to rely more heavily on other sensory inputs, such as vision and somatosensation (proprioception), to replace the missing inner ear data.

  • Habituation: Repeated exposure to a provoking stimulus (like head turning) causes the brain to desensitize .

Factors That Limit Compensation:

The evidence also highlights why some patients fail to compensate, even with therapy:

  • Vestibular Suppressants: Long-term use of drugs like benzodiazepines or antihistamines acts as a "mute button" on the brain, preventing it from recognizing the error signal it needs to fix.

  • Visual Reliance: Some patients become "visually dependent," making it difficult for them to switch to other strategies in dark or busy environments.

  • Psychological Comorbidities: Anxiety and "fear of falling" can lead to stiffened postural strategies, which inhibit motion required for compensation.


Key Takeaways 


Acute Unilateral Vestibulopathy (AUVP) /Vestibular Neuritis can be a frightening and "system-shocking" experience, but the path to regaining your balance is well-mapped. Understanding the recovery process is the first step in moving from the acute "power failure" to long-term stability.

  • Movement is Medicine: True recovery happens through Vestibular Rehabilitation Therapy (VRT). By leveraging neuroplasticity, VRT "retrains" your brain to recalibrate sensory input and rely on new strategies for balance.

  • Mind the "Second Wave": Keep an eye out for secondary issues like BPPV or functional dizziness (PPPD). If the spinning returns in short bursts or a "high alert" feeling lingers, seeing a Vestibular Specialist will help. 

Moving Forward

The most important thing to remember is that compensation is movement-dependent. Your brain cannot recalibrate in a stationary environment. By embracing early movement and specialized exercises, most patients successfully return to their normal lives with a very low risk of the condition ever returning.


References:

1. Strupp, M., Bisdorff, A., Furman, J., Hornibrook, J., Jahn, K., Maire, R., Newman-Toker, D., & Magnusson, M. (2022). Acute unilateral vestibulopathy/vestibular neuritis: Diagnostic criteria. Journal of Vestibular Research, 32(5), 389–406. https://doi.org/10.3233/VES-220201


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  1. Barkhoudarian, G. (2023, April 20). Vestibular neuritis. Medscape. https://emedicine.medscape.com/article/794489-overview


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  2. Somisetty S, Das JM. Neuroanatomy, Vestibulo-ocular Reflex. [Updated 2023 Jul 25]. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2025 Jan-. Available from: https://www.ncbi.nlm.nih.gov/books/NBK545297/


  1. Lee HJ, Lee DH, Seo JH, Son EJ, Jeon EJ. Effectiveness of three vestibular rehabilitation exercises for treating acute unilateral peripheral vestibular dysfunction: a multicenter randomized study. Front Neurol. 2026 Jan 5;16:1687181. doi: 10.3389/fneur.2025.1687181. PMID: 41561330; PMCID: PMC12812630.


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