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Causes of Bilateral Vestibulopathy

Timothy C. Hain, MD Page last modified: February 28, 2017

Additional Disclaimer: This material is not written for legal use, including trial testimony.

About 28/100,000 people in the US have bilateral vestibular loss (Ward et al, 2013).

At Chicago Dizziness and Hearing, we have seen many patients with bilateral vestibulopathy. The figure below shows data from a 176 patient subset of our entire database compiled in 2014. This data is being actively updated and does not include all of our patients, as this is a big project. These are all patients referred for clinical diagnosis. It does not include patients referred through medicolegal review activity.

Pie

As can easily be seen, the majority are "idiopathic", and the second largest group are aminoglycoside ototoxicity. There is also a moderate literature concerning other similar clinic collections (see below).

Clinical Diagnosis

Rinne et al(1998)

N=53

Zingler et al (2007)

N=250

Syms and House, 1995

Number of patients

Chicago Dizziness and Hearing, 2014

n=176

17% 11%

    16

62
<13% 2%

    16

3

    Infection (Meningitis, CJD, bilateral vestibular neuritis)

11% 6%

    11

12
Autoimmune, including Cogan's
9% 2%   2

    Vascular

  0

    12

0
  0

    6

8
  0

    2

<1%
  0

    2

0

    Unknown

21% 51%

    34

89

 

Common Causes:Oscillopsia

"Unknown" -- no diagnosis - -is the most common category for all patients -- roughly accounting for 50% of all cases.

In our own clinical experience, a mixed otology-neurology setting -- we have found gentamicin toxicity to be a predominant cause of bilateral vestibular loss (see pie chart above). This resembles the experience of Gillespie and Minor at Johns Hopkins (see references, Otology setting), who found 66% of their 35 cases caused by ototoxins. Syms and House (1995), at the House Ear institute in Los Angeles, reported a different experience, with more patients diagnosed with Meniere's disease or "vascular" causes.

Zingler et al (2007) found ototoxicity to account for about 20% of their diagnosed patients (they only diagnosed 50% of their cases -- so there were only 10% overall). This is a very low percentage. Zingler also noted a large # of patients with cerebellar signs. These differences in proportion probably reflects referral patterns -- in the patients from Zingler et al, seen in a neurology clinic - -there would reasonable be a higher proportion of patients with neurological problems. Perhaps another clinic in Munich (the setting of the Zingler study) sees patients with ototoxicity. Their report is misleading in that it does not establish that bilateral loss patients, in general, have cerebellar problems. This is simply not a reasonable thought as the hair cells of the inner ear have little to do with the cerebellum. Practically, it is difficult to accumulate sufficient patients in a population based framework, so this question will probably go unanswered.

Nevertheless, in all reports, ototoxicity is the single most common diagnosed cause.

Bilateral sequential vestibular neuritis is a significant cause of bilateral vestibular loss. In these cases, the loss is not complete. While the lateral canals may be unresponsive on both sides, there often is evidence of retained posterior canal function, as well as presumably saccule function. Curiously, Zingler et al reported no patients at all with this condition.

Aging also causes bilateral vestibulopathy, although it is only rarely severe. Roughly, at the age of 80, half of the cells in the vestibular ganglion have died. Blood flow to the inner ear is also reduced with aging (Lyon and Davis, 2001). This reduction presumably contributes to the invariable loss of balance function that occurs as people age. It can be diagnosed with rotatory chair testing.

Like Syms and House, Rinne et al (1998) and Brandt (1996) found about 11% of bilateral loss to derive from meningitis. In persons with bilateral loss following meningitis, hearing is ordinarily also profoundly affected. This can be clearly established if the MRI/CT-Tbone studies show labyrinthitis ossificans - - basically petrification of the inner ear. On MRI, there is no fluid seen on T2. On CT, there is bone rather than fluid seen in the canals. This pattern is simlar to that seen on Cogan's syndrome.

Rare causes:

Meniere's disease, while associated with repeated attacks of vertigo, rarely causes bilateral vestibular loss. Hearing seems to be more sensitive to the disease process of Meniere's than does vestibular function. Some patients diagnosed as Meniere's disease may have their disorder due to autoimmune processes (see below). In some instances the treatments for Meniere's disease may result in bilateral loss. This is not unheard of as many persons with Meniere's develop bilateral disease. Situations may occur where there are bilateral vestibular nerve sections, a nerve section combined with labyrinthectomy, etc.

Autoimmune inner ear disease or AIED undoubtedly causes a moderate number of cases of bilateral vestibular loss. At present the diagnosis of AIED is difficult as there are no reliable laboratory tests for AIED. A combination of a progressive pattern of bilateral vestibular loss, absence of other reasonable causes, response to steroids or other immunomodulator drugs, and coincidence of other autoimmune disorders is used to make the diagnosis in these patients. We have encountered only a single patient with sequential bilateral vestibular loss (and hearing loss), associated with relapsing polychondritis (an autoimmune disorder).

Head trauma is an uncommon cause of bilateral vestibular paresis, and in the very few reported cases, there is also hearing disturbance (e.g. Fenneley et al, 1994). We have encountered this condition in about 5% of our very large population. Occasionally patients with severe and protracted vertigo undergo bilateral vestibular nerve sections in an attempt to eliminate vertigo while preserving hearing.

Migraine associated bilateral vestibular loss. We have encountered this pattern in roughly 1.5% of our patient population.

Another rare cause of bilateral loss is superficial siderosis, an iron deposition usually related to repeated bleeding associated with a tumor or a vascular malformation in the brainstem or cerebellum (Watanabe, 1997). Hearing and vestibular loss gradually progresses over many years (Weekamp et al. 2003). Superficial siderosis can be easily diagnosed on MRI from the characteristic hypointense areas where iron has been deposited. Cochlear implantation may not work in superficial siderosis (Wood et al, 2008)

Autoimmune disease is similarly blamed for a large assortment of mysterious inner ear disorders, including bilateral vestibular loss(Lucieer et al., 2016).

Infections:

Lyme disease is rarely associated with bilateral vestibular loss. Recently, van Leewen et al reported on Lyme and Bilateral loss (van Leeuwen, van Kooten, & de Cock, 2016), in a single patient. They reviewed the literature and stated that their case was the only one. There are actually also some other sporadic case reports of lyme (Farshad-Amacker, Scheffel, Frauenfelder, & Alkadhi, 2013)

Yersinia has been reported on one occasion (Bucheler and Lowenheim, 1997) . Yersinia is related to the bubonic plague.

There are many reports of Syphilis causing hearing and vestibular symptoms together. (Garcia-Berrocal et al, 2006; Steckelberg & McDonald, 1984). We would be dubious that Syphilis could cause isolated bilateral loss.

Hereditary vestibular loss, without hearing loss

There is a rare variant of bilateral vestibular loss that begins with migraine and episodic vertigo. This syndrome responds to acetazolamide (Baloh et al, 1994). We have found a few of these in our own practice.

There is also a potential syndrome of cerebellar ataxia combined with bilateral vestibular loss, as well as a sensory neuropathy. Whether nor not this is a distinct entity or simply a chance occurrence is argued (Szmulewitz et al, 2011). Other cerebellar syndromes with bilateral vestibular loss such as SCA-3 (Machado Joseph), SCA-7, and Friedreich ataxia have overlapping symptoms.

Jen (2009) reviewed a tiny collection of families with inherited bilateral vestibulopathy with normal hearing. These included 3 dutch patients reported by Verhagen and colleagues(1987), the 3 families reported by Baloh (see above), and a Swedish family reported in 2003 by Brandtberg. In the Swedish family, most had normal VEMPs (implying that it may actually have been bilateral vestibular neuritis).

Hereditary hearing loss syndromes

DFNA9 (also called COCH) can culminate in deafness and vestibular loss (Bom, 1999; Lemaire et al, 2003; Verhagen et al, 2000). According to Usami et al, the COCH gene seems to mainly be involved with hearing rather than vestibular symptoms (Usami et al, 2003).

According to Jen, DFNA11 can also cause vestibular disturbances similar to Meniere's.

Tumors

Bilateral vestibular loss from tumors is exceedingly rare. Occasional persons with von Recklinghausen's disease develop bilateral acoustic neuromas. The author of this page has seen one patient in whom an acoustic neuroma was responsible for unilateral loss on one side, combined with presumed vestibular neuritis on the other side.

Surgery

Bilateral vestibular loss from surgery is also unusual. This may result from bilateral vestibular nerve section, or a combination of nerve section on one side and gentamicin on the other. We have encountered several patients with this over the years, and it accounts for about 1% of our population.

References

Copyright February 28, 2017 , Timothy C. Hain, M.D. All rights reserved. Last saved on February 28, 2017