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differences in the majority of neuro-otological tests. However, VM patients had signicantly increased emetic response (more likely to have nausea and/or vom­iting) during caloric testing compared to patients with other causes of dizzi­ness [98].
The majority of patients with VM have normal electronystagmography results. In some studies there have been a number of patients with a unilaterally reduced vestibular response, abnormal directional preponderance on rotational chair test­ing, reduced vestibular response on caloric testing [12], increased postural sway [99, 100] or reduced amplitudes of vestibular myogenic evoked potentials [101,
102]. These results suggest that there is both peripheral and central vestibular
dysfunction present in VM.However, none of these results are sensitive or spe­cic for the diagnosis of VM.It has been considered that testing of combined stimuli to assess vestibular- visual processing may reveal abnormalities more consistent with the VM diagnosis. Testing of visually enhanced vestibulo-ocular reex (VVOR) has been analyzed in migraine patients with vestibular symptoms. In VVOR testing the rotational chair evaluation of the vestibulo-ocular reex is performed in a lighted setting with an optokinetic visual stimulus to produce eye motion. VVOR gain (nystagmus velocity relative to chair rotation speed) has been found to be elevated in patients with VM [103]. There are no other consis­tent responses to caloric or vestibular testing in these patients [93, 94]. Thus, proper diagnosis relies primarily on the astute clinician interpreting the patient’s clinical symptoms.
Patients and their symptoms can be evaluated with the Dizziness Handicap Inventory (DHI) [104] a survey used in vestibular disorders to evaluate patient symptoms and handicap. The average DHI score in a UCSF population of patients with VM was 49. Recently, a validated disease specic survey from UCSF was developed specically for use in VM.The Vestibular Migraine Patient Assessment Tool and Handicap Inventory (VM-PATHI) was validated in 2020 to measure disease severity in vestibular migraine patients [105]. The VM-PATHI is avail­able on the UCSF Balance and Falls website (
https://ohns.ucsf.edu/balance- falls/ vestibular- migraine). The survey covers cognition, emotional disturbance, dis-
equilibrium symptoms, anxiety, motion sensitivity and headache equivalents (Fig.11.2). The survey was developed in three phases: in the rst phase a library of questions for inclusion were developed with experts in neurotology, neurol­ogy, audiology and biostatistics, with the aim of high face and content validity. In the second phase the questions were trialed in a small cohort to determine readability and ease of use. In the nal phase it was administered to a large group of patients to determine reliability, internal consistency, test-retest liability, and was given to controls to assess discriminant validity. It was also compared against the DHI and quality of life measure (Short Form-36). The nal, validated survey has 25 questions about symptoms that are scored on a Likert scale ranging from “no problem” to “problem as bad as it can be.” For the nal survey, Cronbach’s a was 0.92 and test retest reliability was high (r=0.90, p<0.001) [105]. The sur­vey is responsive to treatment as well.
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Cognition Emotional Disturbance
-Productivity at work
-Difficulty concentrating
-Trouble remembering things
-Fatigue
-Photophobia
-Fear of Falling
-Anxiety
-Lightheadedness
-Dizziness with busy visual scenes
-Sadness
-Social avoidance
-False sensation of movement
Motion SensitivityAnxiety
-Spinning vertigo
-Nausea
Disequilibrium
-Phonophobia
-Imbalance
-Difficulty with stairs
-Dizziness with motion
-Difficulty walking
Headache Equivalents
-Head pressure-Motion sickness-Stress
-Ear pressure
-Headache
Fig. 11.2 VM-PATHI questionnaire factors. Principal component analysis of VM-PATHI data showed six natural groupings within the data set [105]
Differential Diagnosis
It is important to distinguish VM from other common causes of vertigo, while rec­ognizing that sometimes, vestibular disorders can coexist. Symptoms of VM over­lap with almost every other cause of dizziness, including benign paroxysmal positional vertigo (BPPV), Meniere’s disease, superior canal dehiscence syndrome (SCDS), mal de debarquement syndrome (MdDS), vestibular neuritis, persistent postural perceptual dizziness (PPPD), and bilateral vestibular hypofunction (BVH).
Like BPPV, VM can cause positional vertigo and nystagmus. Vestibular symp­toms in VM generally have longer duration than in BPPV. Although the duration of vertigo attacks are variable they generally last minutes to hours to days. In BPPV, acute episodes of vertigo are short, generally lasting under a minute. However, in both disorders patients can report mild dizziness or disequilibrium symptoms between attacks which can confound the clinical picture. While the acute nystag­mus in VM can be variable it is usually low velocity and low intensity. It can be horizontal, vertical, or torsional [106]. On the other hand, BPPV nystagmus, when affecting the posterior canal, is torsional upbeating, provoked by the Dix–Hallpike, brief latency, and self-limited. The nystagmus of VM can be worsened or provoked by head movement, generally lasts much longer, and does not tend to fatigue. However, the picture is often complicated by the fact that there is an increased risk of BPPV in patients with migraine [107, 108]. It is important for the clinician to ask patients presenting with dizziness about migrainous features, even when the diagnosis of BPPV seems clear. Furthermore, those with VM should still be screened for BPPV.
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VM often has overlapping symptoms with Meniere’s disease. In vestibular migraine otologic complaints are common, including tinnitus, aural fullness and subjective hearing loss. In addition, the duration of vertigo can be similar: minutes to hours. Audiometry is the single most helpful test in trying to distinguish Meniere’s disease and VM.Vestibular testing in Meniere’s is not always abnormal, however a unilateral caloric weakness with preserved video head impulse testing is considered a hallmark of the disease. More recent studies have shown that VM can progress to objective hearing loss as well [109]. This hearing loss with VM is more likely to be bilateral and low frequency if present, while hearing loss in Meniere’s is unilateral and uctuating. However, attempts at complete disentanglement of VM and Meniere’s may be misguided: there is signicant overlap between them. About half of Meniere’s patients meet the criteria for migraine [110], far more than expected by chance. Practically, some Meniere’s patients, especially those with migrainous his­tory or migrainous symptoms during attacks, do respond to migraine medications.
Vestibular paroxysmia also presents with recurrent vertiginous symptoms. Episodes are recurrent (multiple times per day), spontaneous, and brief (typically under a minute). It is believed to be caused by pressure induced dysfunction of the vestibulocochlear nerve, related to compression by the anterior inferior cerebellar artery [111]. Clinically, the attacks are more brief than seen in VM although the fre­quent recurrences can make it hard to distinguish from the more persistent vestibular symptoms of VM.Vestibular paroxysmia can generally be identied with MR imag­ing showing compression of the eighth cranial nerve. However, MR ndings of blood vessels impinging the eighth nerve are fairly common, so they need to be correlated with symptoms and response to medications to diagnose vestibular paroxysmia.
Superior semicircular canal dehiscence syndrome (SCDS) should also be consid­ered in the differential for VM. SCDS is caused by a deciency in the bony labyrinth and presents with vertigo, disequilibrium, conductive hyperacusis, autophony, con­ductive hearing loss, pulsatile tinnitus and aural fullness [112]. The vertigo in SCDS can be triggered by loud noises (Tulio’s phenomenon) or pressure (Hennenbert’s sign) [113]. SCDS patient’s often also report aural fullness, dizziness between acute vertigo episodes, brain fog, and phonophobia. All subjective SCDS symptoms can be seen with vestibular migraine, including pulsatile tinnitus [87]. Therefore, prac­titioners are advised to keep a high index of suspicion for SCDS, and consider workup with VEMP and CT scan when appropriate. When migraine and SCDS are both present, treatment outcomes for SCDS are worse [114].
Mal de Debarquement Syndrome (MdDS) is another disease that can present with chronic dizziness or imbalance. It is characterized by a persistent sensation of motion and imbalance often described as a sensation of rocking or swaying. It is also associated with ear fullness, hyperacusis, fatigue, poor concentration and visual disturbances [115, 116]. When symptoms clearly are precipitated by sea travel, resulting in chronic rocking, MdDS is the preferred diagnosis. However, patho­physiology is not completely understood, and many with MdDS respond to migraine treatment, suggesting there is overlap [117]. Again, like the other disorders on the differential, patients with migraine have an increased risk of developing (MdDS) [115].
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Persistent postural-perceptual dizziness (PPPD) is another important cause to consider in a patient with chronic vertigo. PPPD patients present with vertigo that is often not described as the classic spinning vertigo variant. They also often report a feeling of unsteadiness. These symptoms are often exacerbated by upright posture, active or passive motion or exposure to moving visuals or other complex visual stim­uli [118]. It is thought that anxiety and hypervigilance help perpetuate PPPD symp­toms [119]. Under current Barany society diagnostic criteria, PPPD is a chronic disorder (symptoms are present on most days), whereas vestibular migraine is an episodic disorder (attacks last 5min to 72h). However, in the author’s experience, many patients with VM have chronic symptoms. Migraine headache is well recog­nized to have both episodic and chronic variants, and therefore we believe that VM has episodic variants (with periods of feeling normal), and chronic variants (symp­toms present most or all days). The chronic variant can be difcult to separate from PPPD, and since the pathophysiology of PPPD explains a maladaptive response to a vestibular challenge, both disorders would be expected to coexist some of the time.
Basilar artery migraine is another migraine syndrome with additional vestibular symptoms such as vertigo, tinnitus and hyperacusis. However, this syndrome also presents with additional transient brainstem symptoms including dysarthria, ataxia, diplopia and decreased consciousness.
Postconcussive syndrome can be symptomatically identical to vestibular migraine, with dizziness, headache, photophobia, phonophobia, difculty concen­trating, and brain fog. The main distinguishing factor is a history of head trauma. Since treatment options for postconcussive syndrome can be limited, the authors will try to treat postconcussive dizziness with migraine medications, with variable success [120].
Other important diseases that should be included in the differential for VM include the following: vertebrobasilar TIA or stroke, basilar artery thrombosis, ver­tebral artery dissection, orthostatic hypotension, peripheral neuropathy, multiple sclerosis, vestibular neuritis, bilateral vestibular loss, seizures and cerebellopontine angle tumors.
Research shows that patients with VM are often misdiagnosed. In a study using 2008 NIHS data 54% of patients with VM had seen a provider for their complaints, with an average of 2.1 providers seen [20]. However, despite frequent provider vis­its, 91% of those that met study criteria for VM did not have a VM diagnosis. The most common dizziness diagnosis received in these patients was “other health prob­lem,” followed by medication side effects and inner ear infection. Only 2.4% of this cohort had a diagnosis of migraine [20].
D. M. Gillard and J. D. Sharon
Treatment
Currently, the treatment paradigm for VM generally follows the approach and man­agement of migraine headache. Conservative management of VM consists of stress reduction, good sleep hygiene, following a regular schedule, treating anxiety,
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avoiding dietary triggers, stabilizing hormone uctuations and avoidance of visual triggers. Common foods that are avoided include red wine, chocolate, caffeine, pro­cessed meats, aged cheeses, tree nuts, bananas, and avocados. There is limited evi­dence for this, although anecdotally some patients do seem to respond to dietary restriction. Over-the-counter dietary supplements have been used for treatment including magnesium, riboavin, feverfew, butterbur, and Coenzyme-Q10. There is reasonable evidence that magnesium supplementation is helpful with treating migraine headaches [121].
If conservative management is not successful for treating VM, a variety of pro­phylactic medications can be used to decrease the frequency and severity of vestibu­lar migraine. Common medications used for classical migraine prophylaxis are used for VM, including tricyclic antidepressants such as nortriptyline, mixed reuptake inhibitors, like venlafaxine, antiepileptics, including topiramate, beta-blockers, such as propranolol and calcium channel blockers such as verapamil [122]. Initial choice of medication is based on several factors, including concurrent medications, comorbidities, and side effect prole (Table11.3). The decision to start a daily med­ication is based on the frequency and severity of attacks. Dosing is increased until side effects occur, or acceptable therapeutic response is achieved. If no response is seen at reasonable doses, then another medication is tried. For partial responses,
Table 11.3 Commonly used oral vestibular migraine prophylactic agents (disclaimer—table is incomplete, consult a drug compendia for full information)
Medication Side effects Contraindications Monitoring Nortriptyline Weight gain,
sedation, dry mouth
Topiramate Tingling in
hands/feet, cognitive changes, fatigue, weight loss
Propranolol Low BP,
worsened depression
Verapamil Low BP Hypotension, cardiac
Venlafaxine Nighttime
sweating, elevated BP, weight loss, sexual dysfunction
Recent myocardial infarction, MAOI use, Sjogren’s
H/o kidney stones, acid/base disorders, kidney failure, glaucoma. May worsen balance
Cardiac disease, asthma, diabetes, hypotension
disease MAOI use CMP/lipids annually,
None routinely, but consider EKG (QT prolongation), BMP (SIADH), or psych eval (worsening depression/ suicidality) as indicated
BMP annually and with dose changes, annual ophtho exam
EKG, BP Anxiety,
EKG, BP HTN
suicidality
Also helpful for
Insomnia, anxiety, depression
Weight loss, seizures
tremor, HTN
Anxiety, depression, weight loss
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doses can be increased. For partial responses with dose-limiting side effects, com­binations of medications can be helpful.
Acute attacks should also be treated symptomatically. Helpful medications include antiemetics (e.g., ondansetron, phenergan), and vestibular suppressants (e.g., meclizine, benzodiazepines). It’s currently unknown if migraine abortives like triptans are effective in reducing vestibular migraine symptoms, they can be tried as well.
It has been difcult to determine whether or not treatments are truly effective for VM.In a 2002 retrospective chart review of 81 VM patients by Repleog etal. [20,
123], 16% of patients had improvement with dietary changes alone, while 66% of
VM patients had complete or signicant symptomatic improvement with medica­tions and 29% had partial symptomatic improvement. In this study patients under­went a stepwise treatment approach which started with dietary changes, then a tricyclic antidepressant and then another migraine prophylactic agent if that did not improve symptoms signicantly. In another retrospective chart review study of 32 patients [124], caffeine cessation was effective for 15% of patients, while nortripty­line was effective for 47% of patients who failed caffeine avoidance. In a 2013 randomized prospective trial comparing betahistine and as needed paracetamol plus or minus unarizine, the unarizine arm had signicantly better vertigo control, while there was no difference in headache control between groups [125]. In a 2015 randomized prospective trial of venlafaxine versus propranolol, both treatment arms had signicant improvement in VM symptoms. There was no difference seen in treatment efcacy based on DHI [125, 126]. It is important to note that this study did not have a placebo-controlled arm. Although there are a variety of studies, the majority are not randomized clinical trials and they often do not compare validated outcome measures to determine efcacy for treatment of vestibular symptoms in VM.
There have also been several investigations into the efcacy of abortive medica­tions for VM treatment, with varying rates of success. Zolmitriptan was studied in a randomized placebo controlled trial, and did outperform placebo, but there were very few vestibular migraine attacks so the study did not achieve adequate power for proper analysis and rm conclusions [125–127]. Sumatriptan improved both ver­tigo and migraine symptoms in a patient survey [128]. Almotriptan was shown to be benecial in reducing vertigo during acute VM attacks in an open label, uncon­trolled retrospective study of 18 subjects [128, 129]. Rizatriptan was investigated in a small study of ten subjects, half with vestibular migraine and half with migraine without dizziness. Subjects were pretreated with either rizatriptan or placebo, and then exposed to several stimuli intended to provoke motion sickness. Rizatriptan was shown to decrease motion sickness in VM patients compared to those with migraine without vertigo [130]. There are also case reports of IV methylpredniso­lone showing efcacy for severe VM treatment [131].
Although there have been a variety of studies, a recent 2015 Cochrane review reported that we cannot determine if treatment for VM is effective as there are not signicantly powered placebo controlled, randomized, clinical trials for VM treat­ment [132]. The author’s treatment paradigm can be seen in Fig.11.3. General treat­ment advice is offered in Table11.4.
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Barany criteria for VM
Physical exam
-Neuro exam including: cerebellar, oculomotor, cranial nerves
-Otoscopy
-Head impulse test
-Dix Hallpike Maneuver
treatments
Asymmetric hearing loss present
Audiogram
VM diagnosis
Conservative Management: Stress reduction, sleep hygiene, avoidance of dietary triggers, hormone stabilization, avoidance of visual triggers, supplements (magnesium, riboflavin, feverfew, butterbur, Coenzyme Q-10), symptomatic medication for acute attacks
Oral prophylactics
CGRP Blockers
Referral to headache center for
Botox, devices, nerve blocks, IV
Consider Meniere’s
Disease, obtain MRI
If anxiety large portion of symptoms, consider mindfulness-based practice
Vestibular physical therapy once motion sensitivity symptoms are better controlled
Obtain MRI
Vestibular Te sting
Treat for BPPV and
reassess
Treat comorbid:
-Anxiety
-Allergies
-Obstructive sleep apnea
Abnormal
neuro exam
Abnormal head
impulse test
Abnormal Dix-
Hallpike
Fig. 11.3 Algorithm for treatment of vestibular migraine. VM vestibular migraine, CGRP calcitonin- gene-related peptide
Clinical Trials andFuture Directions
It is clear that prospective, randomized, placebo-controlled clinical trials are needed to evaluate VM treatment. A recently completed trial, the PROVEMIG trial, was a placebo-controlled randomized controlled trial studying the efcacy of metoprolol for the treatment of VM.After randomizing 130 patients the trial had to be discon­tinued for poor patient accrual. However, there was no signicant difference in inci­dence of vertigo attacks between the placebo and metoprolol groups when the available data were analyzed [133].
There are several ongoing trials investigating the efcacy of various treatment regimes. There are two ongoing trials at UCSF (the author’s institution) for VM treatment. The rst is a mindfulness based stress reduction (MBSR) trial. MBSR is an accepted medical therapy for a variety of conditions. The hypothesis for this trial is that VM patients may benet from MBSR given that there are high rates of medi­cation intolerance, high rates of comorbid anxiety and stress is one of the most common triggers for VM.The pathophysiology of VM may involve sensory hyper­sensitivity, hypervigilance, catastrophizing, and functional maladaptation, which may benet from MBSR therapies. The trial involves a single arm open label pro­spective trial.
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Table 11.4
• Vestibular migraine is incredibly common. All patients with dizziness should be asked about: personal history of migraine, family history of migraine, and migrainous symptoms during attacks.
• Patients will not volunteer information about photophobia or phonophobia during attacks— this has to be specically inquired about.
• Medication sensitivities are very common with VM.Use low doses of medications to start, taper on and off, and counsel appropriately.
• Treatment of anxiety, stress, sleep disorders, and allergies may be helpful.
• Audiometry is helpful in distinguishing Meniere’s disease from VM.
• Adequate time should be set aside for patient counseling about diagnosis and treatment options.
• Vestibular testing is likely to worsen symptoms, therefore consider using it judiciously when a concurrent issue is suspected.
• Minor brain white matter abnormalities are very commonly seen on FLAIR or T2 MRI sequences, reassurance to patients can be very helpful regarding those ndings, which frequently cause alarm.
• Periodic follow-up is usually necessary while nding a specic medication regimen that works for a particular patient.
• Not all patients require pharmacologic intervention.
• Anxiety is a frequent comorbidity in this population. We nd it most helpful to consider a disease modier that also requires treatment. Blaming anxiety for dizziness tends to be clinically counterproductive. We nd that dizziness and anxiety often make each other worse.
• Similar to migraine headache (and despite published criteria) there are likely episodic and chronic forms of vestibular migraine.
• Many symptoms are shared between superior canal dehiscence and vestibular migraine, consider working up for superior canal in select cases, especially when objective ndings are present (weber to one ear, negative bone conduction thresholds, etc.).
Clinical pearls
Another ongoing UCSF trial is the INVESTMENT Trial, INvestigating VESTibular Migraine Emgality Treatment. This is a double-blind, placebo con­trolled randomized clinical trial investigating the efcacy of Galcanezumab-gnlm for the treatment of VM, sponsored by Eli Lilly. The outcomes of the trial are to compare the VM-PATHI, DHI, and quality of life score between treatment and pla­cebo arms as well as to compare the denitive number of dizzy days assessed through a daily text message between arms.
There is also a large multicenter, randomized, placebo-controlled clinical trial at the University of California Los Angeles in conjunction with the Mayo Clinic to study the effectiveness of rizatriptan in the treatment of VM.At the time of writing this chapter the trial has been completed, but results are not yet available.
Conclusions
Vestibular migraine is a very common and treatable cause of dizziness. Barriers to care exist, including underdiagnosis, lack of biomarkers, variable rates of treatment effectiveness, high rates of comorbid anxiety and depression, and lack of high level
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studies. However, there are diagnostic criteria that are helpful in working up patients, as well as symptom and disease specic patient-reported outcome measures that are useful for tracking outcomes. Treatment is generally similar to the treatment of migraine headaches, with both pharmacologic and nonpharmacologic options. When possible, care from a multidisciplinary team can improve the patient experi­ence and care outcomes. More work is required to understand pathophysiology, improve diagnostics, and to understand the effectiveness of different treatment options.
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