On the basis of several clinical studies, we are now able to correctly diagnose and treat the majority of peripheral vestibular disorders. Three typical forms of peripheral vestibular disorders can be differentiated by their characteristic signs and symptoms [1▪]: chronic bilateral peripheral loss of vestibular function, characterized by oscillopsia during head movements and instability of gait and posture; acute/subacute unilateral failure of vestibular function, characterized by a severe rotatory vertigo, oscillopsia, and imbalance; and paroxysmal, inadequate stimulation or inhibition of the peripheral vestibular system, characterized by attacks of vertigo and oscillopsia.
The six most frequent forms of peripheral vestibular disorders are – in the order of their frequency – benign paroxysmal positioning vertigo (BPPV), Menière's disease, vestibular neuritis, bilateral vestibulopathy, vestibular paroxysmia, and superior canal dehiscence syndrome (SCDS; Table 1) [1▪].
Currently, the Classification Committee of the Bárány Society is defining and redefining the diagnostic criteria for these disorders . This is important not only for daily clinical practice, but also for treatment trials. The various forms of vertigo and dizziness disorders can be treated with medical, physical therapy, surgery, and psychotherapeutic measures. The treatment of various peripheral vestibular disorders has been improved as a result of the findings of several controlled trials. There are still deficiencies, however, in the treatment of some these disorders, in particular bilateral vestibulopathy, Menière's disease, acute vestibular neuritis, vestibular paroxysmia, and superior canal dehiscence. In this overview, the major aspects of the cause, pathophysiology, clinical findings, diagnostic criteria, and the therapy of the above-mentioned six most frequent types of peripheral vestibular disorders are summarized.
Key symptoms are movement-dependent postural vertigo and unsteadiness of gait and (in 40% of patients) of the patients blurred vision when walking, as well as impaired spatial memory and navigation [3,4]. Bilateral vestibular failure is the most frequent cause of movement-dependent postural vertigo in elderly patients. The disease has a pronounced negative impact on physical and social functioning, leading to the deterioration of quality of life .
The diagnosis is confirmed by testing the vestibulo-ocular reflex (VOR) by a combination of a bilaterally pathological head-impulse test and the caloric test. These tests reveal three groups of patients in terms of canal function: those with a combined high- and low-frequency deficit (the majority), those with only a high-frequency deficit, or those with only a low-frequency deficit . In addition, measurements of the dynamic visual acuity by either the VOR reading test to determine visual acuity during head turns  or during walking [8▪] are also helpful to support the diagnosis. All these laboratory examinations test canal function [for tests on otolith function see the chapter on vestibular-evoked myogenic potentials (VEMPs) by Sally Rosengren]. There is also a rare subcategory of ‘bilateral sacculopathy’, in which the canal function is normal .
Up to 20% of patients with bilateral vestibulopathy frequently also have a cerebellar syndrome, in particular cerebellar ocular motor dysfunction and downbeat nystagmus [10▪▪,11]. This new syndrome is called cerebellar ataxia, neuropathy, and vestibular areflexia syndrome (CANVAS) [10▪▪]. It is probably caused by neurodegeneration that affects the cerebellar, ocular motor, and vestibular systems with an additional neuropathy.
Treatment of the various forms of bilateral vestibulopathy follows three lines of action: prophylaxis of progressive vestibular loss, recovery of vestibular function, and promotion of central compensation or substitution  for missing vestibular function with physical therapy. The efficacy of balance training was confirmed at least for patients with unilateral peripheral vestibular function disorders  (see the chapter by Susan Herdman on vestibular rehabilitation). In the long term, vestibular implants will be a therapeutic option. They have had very promising results in animal studies  and also in a pilot trial in humans [15▪▪].
The key signs and symptoms of vestibular neuritis are acute onset of sustained rotatory vertigo; horizontal rotatory peripheral vestibular spontaneous nystagmus toward the unaffected ear, which typically can be suppressed by visual fixation; a pathological head-impulse test; and postural imbalance.
The following aspects of vestibular neuritis will be discussed in the light of the latest literature: the differential diagnosis of vestibular neuritis and central vestibular pseudoneuritis, cause of the disease, subtypes of vestibular neuritis which affect the superior vestibular or the inferior vestibular nerve, long-term course, recurrence rate, complications, and causative treatment.
Vestibular neuritis or vestibular pseudoneuritis
From a clinical point of view, the first question to be answered in patients with acute vertigo and nystagmus is whether the symptoms are caused by vestibular neuritis or central ‘vestibular pseudoneuritis’. Several clinical studies have been published on this issue over the last 5 years [16–20]. The following five signs (the big five) of a central lesion were identified: ‘skew deviation’ (vertical divergence) as a component of the ocular tilt reaction, gaze-evoked nystagmus contralateral to the quick phase of the spontaneous nystagmus, saccadic smooth pursuit, a normal head-impulse test in a patient with acute nystagmus, and a central fixation nystagmus, which is typically not suppressed by visual fixation. The combination of these clinical signs allows us to discriminate between a central and a peripheral lesion with a sensitivity and specificity of more than 95%.
There is increasing evidence that vestibular neuritis is caused by the reactivation of a latent herpes simplex virus type 1 (HSV-1) infection: HSV-I DNA has been detected on autopsy with the use of polymerase chain reaction in about two of three human vestibular ganglia as well as the expression of CD8-positive T-lymphocytes, cytokines, and chemokines. These findings indicate that the vestibular ganglia are latently infected with HSV-1 . Recent results of animal studies support this view: latently and lytically HSV-1 infection and reactivation were demonstrated in cultured rat vestibular ganglion cells . A mouse model showed that the inoculation of HSV could induce vestibular dysfunction with infected vestibular ganglion cells .
Superior and inferior vestibular nerve vestibular neuritis
The superior vestibular nerve innervates the horizontal and anterior semicircular canals, the utricle, and the anterosuperior part of the sacculus. The inferior vestibular nerve innervates the posterior semicircular canal and the posteroinferior part of the sacculus. Three-dimensional recordings of spontaneous nystagmus and the dynamic VOR deficit showed that the function of the posterior canal is spared in most thus afflicted patients , that is, it most often affects the superior vestibular nerve. Measurements with ocular VEMP showed an impairment of the utricular function in most patients with acute vestibular neuritis , as well as of the saccular function by cervical VEMP [26,27] (see the chapter by Sally Rosengren). This explains why patients with vestibular neuritis can suffer from posterior canal BPPV. Why is the superior vestibular nerve more often affected? It is longer and has more speculae ; further, the posterior semicircular canal is innervated by an additional anastomosis.
On the basis of the above-mentioned, three-dimensional VOR measurements , the rarer subtype of inferior vestibular neuritis (accounting for about 10% of all patients with vestibular neuritis) has been examined in detail with three-dimensional vector analysis and in particular with cVEMPs and oVEMPs [27,29,30]. This is now the established cause of acute vertigo.
Long-term course, recurrence rate, and complications
In the course of the illness, the peripheral vestibular function does not spontaneously completely recover in most patients . The recurrence rate is between 2 and 11% [32,33]. In 10–15% of patients with vestibular neuritis, a typical BPPV develops in the affected ear within a few weeks . It is likely that the otoconia loosen during the additional inflammation of the labyrinth, because HSV-1 DNA was also found in the labyrinth of humans and this eventually results in canalolithiasis. The second important complication is that vestibular neuritis can develop into phobic postural vertigo .
The treatment of acute vestibular neuritis is based on three principles: first, symptomatic therapy for vertigo, nausea, and vomiting; second, causative treatment; and third, vestibular exercises to improve central compensation (for the latter, see the chapter by Susan Herdman).
Studies in the 1990s indicated that glucocorticoids can improve the course of ‘acute vertigo’. A prospective, randomized, placebo-controlled study in 141 patients had shown that monotherapy with methylprednisolone significantly improved the peripheral vestibular function of patients . Valacyclovir had no influence on the course of the disease, neither as monotherapy nor in combination with methylprednisolone. Although the benefit of steroids was confirmed by another study  as well as by a meta-analysis , a Cochrane analysis still makes no general treatment recommendation for corticosteroids. A trend was seen 1 month after the illness began . More studies need to be performed, and the effects on quality of life have still not been investigated sufficiently . This means that there is urgent need for at least two additional state-of-the-art clinical trials on the effects of steroids on the recovery of vestibular function and quality of life.
BENIGN PAROXYSMAL POSITIONING NYSTAGMUS
The definite diagnosis of benign paroxysmal positional vertigo (BPPV) requires positional maneuvers that result in a canal-specific positional nystagmus [41▪]. The observance of this nystagmus allows one to differentiate between canalolithiasis of the posterior semicircular canal (pc-BPPV), the horizontal canal (hc-BPPV), and cupulolithiasis of the horizontal canal (hc-BPPV-cu). Further diagnostic classifications include canalolithiasis of the anterior canal (ac-BPPV), cupulolithiasis of the posterior canal (pc-BPPV-cu), lithiasis of multiple canals (mc-BPPV), as well as the distinction between ‘probable’ (spontaneously resolved) and ‘possible’ BPPV [41▪]. Central cerebellar dysfunctions such as infarctions of the nodulus can mimic BPPV  or positional nystagmus; this is also found in vestibular migraine [43▪].
Evidence-based reviews conclude that therapeutic positional maneuvers are most effective for the relief of typical BPPV, especially for canalolithiasis as compared to cupulolithiasis . A new therapeutic maneuver has been described for ac-BPPV. It consists of sequential head positionings: beginning supine with head hanging 30° downward with respect to the body, then supine with head inclined 30° forward, and ending sitting with head inclined 30° forward .
Patients with BPPV of the lateral semicircular canal can present with the geotropic form, in which the debris floats in the posterior arm of the canal (canalolithiasis), or with the apogeotropic form, in which the debris can either float in the anterior arm of the canal or be attached to the cupula (cupulolithiasis) . Two different therapeutic positional maneuvers were tested for apogeotropic hc-BPPV in a randomized clinical trial: head-shaking with 3 Hz in the sitting patient while the head was held downward at an angle of 30° and the so-called Gufoni maneuver, in which the patient lay on the ipsilesional side and turned his or her head upward to promote migration of the debris toward the vestibule [47▪].
Menière's disease is clinically characterized by recurrent spontaneous attacks of vertigo, fluctuating hearing loss, tinnitus, and aural fullness. More than 6900 papers have been published on Menière's disease according to a PubMed search, and each year more than 100 new papers are published. This high number shows that there are still many areas of uncertainty about this disorder, although it was first described in 1861. Currently, two topics are being addressed in clinical research on Menière's disease: first, the imaging of the inner ear with high-resolution MRI after transtympanic gadolinium injection and second, the new treatment options (more than 3500 publications).
Visualization of endolymphatic hydrops
Endolymphatic hydrops is the pathological hallmark of Menière's disease. In 2007, Nakashima et al. were able to demonstrate endolymphatic hydrops in patients with Menière's disease in vivo by high-resolution MRI after transtympanic gadolinium injection, because gadolinium primarily diffuses into the perilymphatic space. Since then, this technique has been considerably improved, shown to be reliable , and has even been used for treatment trials to evaluate the effects of different agents on endolymphatic hydrops. The intravenous administration of gadolinium also causes an enhancement of the perilymphatic space but considerably less so than when given transtympanically [50,51]. Thus, the transtympanic route is currently favored. Vestibular and audiological deficits correlate with the extent of the endolymphatic hydrops [52–55]; moreover, a herniation of the membranous labyrinth into the horizontal semicircular canal could be correlated with impaired caloric response in Menière's disease patients. As regards the treatment and imaging, a case study on five patients reported that the outcome of a treatment with gentamicin could not be predicted by this imaging technique . Another study with gentamicin in eight patients observed no change of endolymphatic hydrops in four and a worsening in three. Finally, a study on six patients treated with 48 mg betahistine per day did not find a decrease of endolymphatic hydrops after a mean follow-up time of 11 months . All in all, this is a very promising imaging technique for visualizing endolymphatic hydrops. It will considerably improve our knowledge of the pathophysiology and treatment of Menière's disease.
There is a plethora of treatment strategies for Menière's disease: destructive procedures, effective but destructive; endolymphatic sac decompression, not effective ; restriction of salt and fluid intake and diuretics, also not effective . Evidently, gentamicin, transtympanic glucocorticoids, and betahistine are effective .
The effect of gentamicin is based on its direct damage to vestibular type 1 hair cells. Two prospective, double-blind, randomized controlled studies have shown efficacy for the symptoms of vertigo [61,62]. These results have been supported by a Cochrane analysis . There are two fundamental problems with treatment with aminoglycosides. First, there is accompanying hearing damage, which affects at least 20% of the patients; for this reason, only patients with obvious preexisting hearing damage should actually receive this treatment. Second, it should be given only in one ear, although more than 40% of the patients develop a bilateral Menière's disease after a period of 20 years.
Transtympanic administration of glucocorticoids
A controlled, prospective, double-blind study showed that attacks of vertigo improved in 82% as opposed to 57% in the placebo group . According to a Cochrane analysis , this study is so far the only one that has been performed with precise methods. Thus, there is only limited evidence that transtympanic administration of glucocorticoids is effective. In a prospective, controlled, randomized study, the effect of intratympanic gentamicin was compared with that of dexamethasone [66▪]: gentamicin was clearly superior, reducing vertigo attacks by 93% compared with 61% with dexamethasone.
This agent is a weak histamine H1 agonist and a stronger H3 antagonist. Despite its widespread use, its pharmacological mode of action has not been entirely elucidated. Several animal studies have shown that betahistine increases cochlear blood flow in vivo; none of these studies, however, found a dose–response curve. The dosage of betahistine administered intravenously in these studies ranged from 0.1 to 10.0 mg/kg body weight. Corresponding doses for clinical use, however, range from about 0.05 to 0.6 mg/kg body weight orally [67,68]. Recently, the effects of betahistine on cochlear microcirculation at dosages corresponding to clinically used doses were reevaluated in an animal model [69▪▪]. When betahistine was administered at a dose of 1.0 mg/kg body weight, cochlear blood flow was increased to a peak value of 1.34 arbitrary units compared to baseline with a sigmoid correlation between the increase in blood flow and the dosages (Fig. 1). The effects of the dosage range of betahistine on cochlear microcirculation corresponded well to the clinically used single dosages to treat Menière's disease. This suggests that the improved effects of higher doses of betahistine for the treatment of Menière's disease might be because of a corresponding increase of cochlear blood flow [69▪▪].
Meta-analyses show that betahistine evidently has a prophylactic effect on the attacks of Menière's disease , although no placebo-controlled, double-blind study has yet been published. On the basis of clinical experience with a dosing regimen of 3 × 48 mg/day betahistine dihydrochloride, an open pilot study was performed in 112 patients receiving either 3 × 16 or 3 × 24 mg/day or 3 × 48 mg/day. This study showed that the higher doses were significantly superior to the usual dosage of 3 × 16–3 × 24 mg/day: after 12 months, the average number of attacks declined from 7.6 per month to 4.4 in the low-dosage group and from 8.8 to 1.0 in the high-dosage group in the group comparison . If the patients do not respond sufficiently after 3 months on a dosage of 3 × 48 mg/day, the dose can be successively increased up to 480 mg/day in individual cases . At the present time, a multicenter, placebo-controlled, dose-finding study is being conducted (3 × 16 vs. 3 × 48 mg/day) (EudraCT-Nr. 2005-000752-32; BMBF177zfyGT).
Vestibular paroxysmia is characterized by spontaneous, recurrent, short-lasting attacks of vertigo . Constructive interference in the steady-state magnetic resonance imaging (CISS MRI) showed neurovascular cross-compression of the eighth nerve, particularly by the anterior inferior cerebellar artery , in more than 95% of these patients. Such vessel–nerve contacts are, however, also seen in healthy individuals, also well recognized for trigeminal neuralgia . In trigeminal neuralgia, high-resolution diffusion tensor imaging revealed significant lower anisotropy and a higher apparent diffusion coefficient in the affected trigeminal root, which correlates with structural atrophic nerve changes . A comparable study is not yet available for the eighth nerve.
The brief and frequent attacks of vertigo with postural imbalance respond to carbamazepine, even in low dosages . A follow-up of 32 patients (mean follow-up time 31.3 months) proved not only the usefulness of the diagnostic criteria, but also the efficacy of this medical treatment . Carbamazepine is currently the drug of first choice. There is limited evidence for the use of lamotrigine, baclofen, topiramate [75,76], or nonantiepileptic drugs in trigeminal neuralgia  and for gabapentine in vestibular paroxysmia . For medically refractive trigeminal neuralgia, nonablative microvascular decompression is still the preferred surgical approach , although a Cochrane analysis criticized the poor quality of clinical trials used to help in comparative decision-making regarding the best surgical procedure . Microvascular decompression of the eighth nerve was shown earlier to be effective for the neurovascular compression of the eighth nerve  and also recently for a clinically well documented case of vestibular paroxysmia [82▪].
Can central lesions mimic peripheral neurovascular compression syndromes? Trigeminal neuralgia and Lhermitte's phenomenon occur in multiple sclerosis and are classified as paroxysmal neuropathic pains caused by ectopic impulse generation along primary afferents . So far, multiple sclerosis has not been described as a cause of vestibular paroxysmia because of demyelinating plaques at the root entry zone of the vestibular nerve. Carbamazepine-responsive paroxysmal dysarthria and ataxia in multiple sclerosis are different; they occur with midbrain lesions below the level of the red nucleus [84,85].
PERILYMPH FISTULA AND SUPERIOR CANAL DEHISCENCE SYNDROME
The symptoms of perilymph fistula and its most important subtype SCDS are recurrent attacks of vertigo, dizziness, or imbalance induced by changes of pressure with or without hearing problems. The incidence and prevalence of perilymph fistulas are not known [1▪]. The course of illness varies. As a rule, they resolve spontaneously and there are symptom-free periods of varying durations. It has been proposed that the presence of stable perilymph proteins is a specific marker of perilymph fistulas ; however, the diagnostic selectivity of these proteins is ambiguous .
So-called canal dehiscence most often involves the superior, rarely the lateral, or posterior semicircular canals . The clinical diagnosis of SCDS must be confirmed by thin-slice computed tomography (CT) of the petrous bone, which shows an apical bony defect of the canal. High-resolution temporal bone CT, however, may demonstrate a false canal dehiscence . Thus, it is necessary to combine radiological findings with the typical clinical signs and symptoms in order to confirm the diagnosis. Electrophysiologically cervical and ocular VEMP generally show a reduced sensory threshold [90,91] in the affected (or worse ear). The length of the dehiscence found in patients who underwent surgical repair correlated with the maximal air–bone gap, but not with clinical and electrophysiological variables .
Postoperative investigations indicate that there is some sensorineural hearing loss , transient impairment of balance measures, and a pathological head-impulse test in the plane of the affected canal . Double-sided occlusion of the superior canal has been performed in patients with bilateral SCDS. Although a few of these patients complained in particular of oscillopsia, they were apparently satisfied with the improvement of the other symptoms . The dehiscence syndrome also occurs in children, often at first only with auditory signs . Conservative management is preferred for children.
For the most frequent forms of peripheral vestibular disorders (BPPV of the posterior, horizontal, or very rarely the anterior semicircular canal, Menière's disease, vestibular neuritis, vestibular paroxysmia, and SCDS), we have reliable diagnostic criteria which are currently being further improved by the Classification Committee of the Bárány Society. In Menière's disease, a new imaging technique with high-resolution MRI of the inner ear after transtympanic injection of gadolinium is a promising measure to visualize endolymphatic hydrops and thereby useful for a better understanding of its pathophysiology and the action of drugs used to treat this frequent disorder. There are still uncertainties in the treatment of Menière's disease, despite more than 3500 papers on this topic, acute vestibular neuritis, and vestibular paroxysmia which require state-of-the-art clinical trials.
The authors would like to thank Judy Benson for copy-editing the manuscript.
Conflicts of interest
There are no conflicts of interest.
This work was supported by the Federal Ministry of Research and Education (BMBF) to the German Center for Vertigo and Balance Disorders (IFBLMU) (Grant No. 01EO0901).
REFERENCES AND RECOMMENDED READING
Papers of particular interest, published within the annual period of review, have been highlighted as:
- ▪ of special interest
- ▪▪ of outstanding interest
Additional references related to this topic can also be found in the Current World Literature section in this issue (p. 107).
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