Published: August 24, 2020

Vestibular Migraines and Vestibular Therapy

Vestibular migraine (VM) has become an increasingly recognized etiology of episodic vertigo. However, due to its overlapping symptomatology with peripheral vestibular disorders and a lack of awareness in the medical community, VM is frequently underdiagnosed or mismanaged. The diagnostic criteria for VM are based on the International Classification of Headache Disorders and the International Classification of Vestibular Disorders (ICVD) of The Bárány Society.

Misheelt Batjargal, MD, Varun V. Varadarajan, MD, and Oliver F. Adunka, MD

Vestibular migraine (VM) has become an increasingly recognized etiology of episodic vertigo.1-5,7 However, due to its overlapping symptomatology with peripheral vestibular disorders and a lack of awareness in the medical community, VM is frequently underdiagnosed or mismanaged.3 The diagnostic criteria for VM are based on the International Classification of Headache Disorders and the International Classification of Vestibular Disorders (ICVD) of The Bárány Society (Table 1).1,3,5,6,11-14 The Bárány Society criteria classifies the diagnosis as either “actual” VM or “probable” VM.3,5,9,12

TableAtypical presentations or patients presenting early in their disease course (i.e., forme fruste) often pose a diagnostic challenge; headache symptoms may be less severe or not present.3 However, migraine features such as photophobia, phonophobia, and visual aura may accompany vertigo attacks with or without headache.5 There are a range of vestibular complaints reported during VM attacks, including spontaneous vertigo, positional vertigo, head motion induced vertigo, postural unsteadiness, oscillopsia, visually induced dizziness, directional pulsion, and head fullness or pressure.3-6 VM is also more prevalent in patients with benign paroxysmal positional vertigo (BPPV) and migraineurs may have an increased risk of developing BPPV.5 VM patients have a lower threshold for motion sickness, and approximately half of sufferers have been reported to experience motion sickness.3,6

The association of VM with audiologic symptoms may mislead the clinician and subsequently lead to a particularly challenging diagnostic process. To add to the confusion, there is an increased incidence of cochlear disorders in migraine patients.8 Pure tone audiometry may be affected to a mild degree, particularly in the low frequencies. A symmetric and nonprogressive pattern has been described by several authors.3,5,7 Central auditory pathways also appear to be affected in some individuals, with a prolonged wave V peak and interpeak latencies reported on auditory brainstem response.3,7 In up to two-thirds of affected individuals, VM may closely resemble Ménière’s disease (MD) with accompanying tinnitus, aural fullness, fluctuating low-frequency sensorineural hearing loss (SNHL), or sudden SNHL.5,7,8 Conversely, migraines are more commonly reported in patients with MD, and patients may meet diagnostic criteria for both conditions.5,8 Cervical and ocular vestibular-evoked myogenic potentials (VEMPs) have shown conflicting results in VM patients, and some reports shows no difference between patients with migraine, VM, and healthy controls.3,5

Identifying triggers may aid in the diagnosis of VM when the history does not suggest a clear etiology. Common triggers for VM attacks are stress, bright lights, sleep deprivation, weather (barometric pressure) changes, physical motion, visual triggers, noisy environments, and dietary tyramine such as aged cheese, cured meat, and alcohol.6 There has been an increased prevalence of sleep disorders and poor sleep quality in VM patients.5,6 Psychiatric comorbidities, especially anxiety and depression, are also common in patients with VM and are associated with an increased incidence of migraine disorders.3 Some patients with VM may experience Alice in Wonderland syndrome, characterized by dysperceptions between episodes that may be mistaken for psychosis.3

Trigger avoidance, the avoidance of high tyramine and caffeine foods, proper sleep hygiene, regular meals, exercise, and stress management are considered by many to be the first line treatment for suspected VM. Diet and lifestyle modifications alone may be effective in some patients.3,5 Pharmacologic treatment may be classified into abortive treatment as well as preventative management. Benzodiazepines, meclizine, dimenhydrinate, or transdermal scopolamine could be offered for abortive treatment during severe attacks. Newer serotonin receptors antagonist (triptan derivatives),1 venlafaxine, and valproic acid are effective in early phase of the VM attack and overall dizziness.3 Prophylactic treatments are indicated when VM attacks occur for several months, continue over several weeks, or if the patient’s lifestyle is severely impacted. Antihypertensives, antidepressant, and antiepileptic drugs are often effective in reducing the frequency and severity of VM symptoms.5 A stepwise approach may start with beta-blocker or calcium-channel blocker (Propranolol 40-240 mg, Metoprolol 50-200 mg, diltiazem 120-240 mg, nimodipine 30-90mg).1 Flunarizine and cinnarizine are alternative calcium channel blockers that may decrease the severity or frequency of vertigo.3,5,9 Tricyclic antidepressants and carbonic anhydrase inhibitors (acetazolamide) have been reported to demonstrate similar efficacy in symptom reduction.5,9 Surgical intervention remains controversial: neuromodulation with vagal nerve stimulation or external trigeminal nerve stimulation have been described as potentially effective rescue treatments.2,4 However, prospective clinical trials are warranted before surgical intervention is routinely recommended for VM.10

Vestibular rehabilitation (VR) may be offered as an adjunct in the treatment of chronic balance dysfunction in VM. VR is based on central mechanisms of neuroplasticity, which includes adaptation, habituation, and substitution that facilitate vestibular compensation.10,11 VR aims to reduce functional impairment by targeting gaze stability, habituation, and enhancing gait and overall balance. Some other components of VR are general strengthening and stretching exercises, balance retraining exercises, aerobic training, swimming or cycling, and vestibulo-ocular and vestibulo-spinal reflex training.11 The efficacy of VR has yet to be confirmed via larger, prospective studies; however, a recent systematic review reported that all patients benefitted to some degree from a customized VR program.10 Outcome measures such as the Activities-Specific Balance Confidence Scale, Dizziness Handicap Inventory, and/or the Perception of Dizziness Symptoms tool all demonstrated significant improvement in both VM patients as well as nonmigrainous vestibular disorder group.10



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More from September 2020 – Vol. 39, No. 8