Ahmad H. Alghadir
Shahnawaz Anwer- Rehabilitation Research Chair, College of Applied Medical Sciences, King Saud University, Riyadh, Saudi Arabia
Vestibular rehabilitation (VR) has been shown to be effective for many vestibular disorders. This review focuses on the current evidence on the effects of physical therapy in the management of vestibular symptoms in individuals with a vestibular migraine (VM). The individuals with a history of a migraine tend to have a high incidence of vestibular symptoms with some or all of their headaches. A total of six included studies investigated the effects of VR in the management of VM. The critical review form for quantitative studies was used to appraise quality assessment and risk of bias in the selected studies. Previous studies validated the use of VR in the treatment of vestibular symptoms for individuals with a VM to include improved headache and migraine-related disability in patients with a VM. From the current evidence, it is difficult to provide conclusive evidence regarding the efficacy of VR to minimize vestibular symptoms in patients with VM. Therefore, more randomized controlled studies are required to make firm evidence on the effect of VR in reducing vestibular symptoms in patients with VM. The future prospective, blinded, randomized controlled studies may help to isolate possible therapeutic effects of VR and other general effects.
Introduction
Migraine is the most prevalent neurological disorder affecting about 1 out of every 7 Americans annually, and results in numerous emergency department and outpatient visits (1). Migraine is considered an important public health problem, especially among women during their reproductive years (1). A migraine is a primary headache disorder characterized by recurrent headaches that are moderate to severe (2). The component of a migraine headache may be present with associated neuro-otological symptoms such as dizziness, vertigo, and unsteadiness (3–5). When the vestibular symptoms are attributed to a migraine mechanism, it is currently known as a vestibular migraine (VM). Migraine-related vestibular disorders may be developed by increased excitability of sensory information processing. Recently, the association between a migraine and vestibular symptoms has been demonstrated by a larger population-based study indicating that people with VM are more susceptible to have vestibular symptoms such as vertigo (6). VM is a frequent cause of intermittent vertigo in adults. The patients may have complained of dizziness, vertigo or imbalance (7–9). In very severe vestibular symptoms in migraine context, the individuals may have manifestations of nausea, vomiting (10), motion sensitivity (visual vertigo) (8, 11–13), and postural instability (4, 13). The most current findings on migraine treatment have shown a limited effectiveness at reducing or preventing acute attacks of vertigo (14). However, the access of drug therapy has been shown to be as low as 36%, which further reduced to 13% at follow-up even though most of the patients had ongoing vertigo symptoms (15).
Vestibular rehabilitation (VR) is a therapeutic approach to treat dizziness and balance dysfunction, and is based on central mechanisms of neuroplasticity, which includes adaptation, habituation, and substitution, that facilitate vestibular compensation (16, 17). VR has been shown to be effective for many vestibular disorders (8, 18–25). Herdman et al. (26) reported improvement in postural stability after VR in patients with post acoustic neuroma resection. Similarly, the patients of vestibular neurectomy, labyrinthectomy, and Meniere's disease were shown successful outcomes after VR (23). This article briefly reviews the prevalence, diagnosis, clinical manifestation, and treatment of a VM and focuses the role of VR in the management of vestibular symptoms in individuals with a VM.
Epidemiology of the Association of Vestibular Migraine and Dizziness
The current scientific definitions of vertigo, imbalance, and dizziness are based on the recommendations of the International Bárány Society for Neuro-Otology. Vertigo is the self-perceived feeling of motion when no self-motion is happening; imbalance or unsteadiness is a self-perceived feeling about instability while sitting, standing, or walking without a specific directional choice; and dizziness is a self-perceived feeling of altered or impaired spatial orientation without a faulty or distorted sense of motion (27). All three of these can occur in peripheral, central and higher vestibular disorders (28).
The prevalence of a VM is more common as compared to other vestibular disorders such as Meniere's disease and vestibular neuritis (29, 30), particularly in women (women to men ratio is 5:1) (31). The annual prevalence of a VM is 0.89%, as reported in previously published studies (3, 32). A recent study confirms that VM is the most commonly seen conditions in the balance disorders clinic, with 41% of patients reported in the clinic were diagnosed with VM (33).
Previous epidemiological studies reported consistent evidence for an association between a migraine and vestibular symptoms. von Brevern and Neuhauser reported a significantly higher prevalence of migraine patients in the dizzy clinic as compared to the orthopedic clinic (34). In one study, over 50% headache sufferers reported dizziness or vertigo with their headaches (35). Vukovic et al. (36) reported a more frequent history of vertigo in migraine patients compared to headache-free controls.
Diagnostic Criteria of VM
The diagnosis of a VM for a patient presents an unnerving challenge to the physician for various reasons (18). The absence of any pathognomonic signs, biomarkers, blood, or lab tests and the presence of overlap symptoms between the VM and the other causes of vertigo make it more difficult to confirm the diagnosis of VM. In addition, the “International Headache Society (IHS)” is given diagnostic criteria for a basilar migraine that includes “Vertigo” as a symptom (37). Hence, to diagnose VM, one must exclude all other causes of vertigo.
Neuhauser et al. (31) suggested a set of guidelines which are sub-divided into obvious and apparent VM criteria based on migraine diagnosis given by IHS and eliminating all other probable causes by the pertinent Neuro-otological investigation. Recently, Lempert et al. (38) published a consensus document of the “Barany Society and the International Headache Society” for the diagnostic criteria of VM (Table 1).
Table 1. Diagnostic criteria for vestibular migraine (38).
Clinical Manifestations of VM
The clinical manifestation of VM varies for each patient, including frequency and duration of episodes (30, 31). The history of spontaneous or positional vertigo is the typical feature of VM (31). Some patients have reported positional vertigo after a few hours or days following spontaneous vertigo (39, 40). This positional vertigo differs from “benign paroxysmal positional vertigo (BPPV)” with respect to the duration of each attack (often seconds only in BPPV vs. as long as head position is maintained in VM), duration of episodes (weeks in BPPV vs. minutes to days in VM) and presence of “nystagmus” which depends on the head position but does not match a particular semicircular canal in the case of VM (31, 41).
The most suggestive feature of VM is visual vertigo, defined as “vertigo worsened by any visual stimulation such as scrolling patterns, moving objects, and the movement of large crowds” (8, 42, 43). Like other vestibular disorders, along with vertigo, patients with VM may have phonophobia (intolerance to loud sound), osmophobia (psychological hypersensitivity to odors), photophobia (abnormal intolerance to visual perception of light), and visual or other auras (31). An aura is a temporary important neurological phenomenon that appears before or during a headache (44). The duration of an aura can differ from a few seconds to several minutes or several hours and sometime to a few days (5, 13, 18, 45, 46); however, the diagnostic criteria of VM require an aura with a minimum duration of 5 min and the aura seldom exceed 72 h.
Furthermore, the episode of vertigo and headache may not occur together, which make more difficult to diagnose this disorder (13, 18, 28). Individuals with VM generally have lower quality of life measures (3) including depression and sleep problems (47). The neurological examination of the patients with VM is usually normal between the attacks (48). During the episodes of vertigo, the patient shows signs of nystagmus and vision problem such as sensitivity to light; suggestive of either a central or peripheral vestibular abnormality (49–51).
Treatment
Various treatment options are available for patients with VM, which includes reduction of triggers, pharmacotherapy, and physical therapy (48, 52). However, no specific evidence-based treatment is available, and no randomized controlled trials for the treatment of VM exist, mainly due to lack of diagnostic criteria (48). Rather, treatments are based on those for a migraine headache (48).
Abortive therapy is used to treat an acute attack of a headache or vertigo. The triptans like sumatriptan were reported to be effective when the vestibular symptoms were associated or not associated with a headache (53). A placebo-controlled study by Neuhauser et al. (54) investigated the drug zolmitriptan for VM attacks. The results were inconclusive because of small sample size limited to 10 patients only. In general, there are very few options available for abortive treatment of VM attacks.
The next strategies of treatment consist of prophylactic medications. Past studies (14, 29, 55) recommended the use of prophylactic drugs for VM as for a migraine, which includes antidepressants, β-blockers, and anticonvulsants. In contrast, a previous review of eight retrospective studies on the treatment of VM reported negligible improvement with a migraine prophylactic medication (14). Therefore, more high-quality studies are required to make firm evidence on the effect of prophylactic drugs in the treatment VM.
The use of nonpharmaceutical methods such as VR in the management of VM is also helpful (23) and in some patients, these approaches were found to be more effective than drugs (31). Some patients, especially those with persistent symptoms of attacks, may benefit from VR (23). The role of VR tends to become more important if secondary complications such as deconditioning, imbalance or visual dependence have developed (56, 57). However, it was not confirmed by any high quality randomized controlled studies. A recent study suggested underutilization of VR in the management of patients with VM, despite 56% of the patients reporting motion-induced symptoms (33). However, this was a retrospective study (level IV) of 90 people with VM; only 14 patients had rehabilitation so they suggest that rehabilitation may be under-utilized but the research of VR being effective in relieving headache and vestibular symptoms isn't conclusive.
Outcome Measures
There are varieties of outcome measures that are used to quantify the effects of VR. Some of them are as follows: Activities-specific Balance Confidence Scale (ABC), Dizziness Handicap Inventory (DHI), the Dynamic Gait Index (DGI). The ABC scale was designed to assess balance confidence in performing varieties of daily activities, for instance walking in the house, stair climbing, and walking on slippery floors. The questionnaire includes 16 items scored on a range from 0 to 100% (0 signify no confidence and 100 signifies full confidence) (58). The ABC scale was reported to be a valid scale in people with vestibular disorders (59). High scores indicate better and scores of 67 or less in community-living older adults have been associated with increased fall risk (60). The DHI is a reliable and valid self-report measure used in people with vertigo (61). The DHI is comprised of 25 items in three domains (functional, emotional, and physical) with three response levels. The possible total score ranges are 0–100 (62). Higher scores indicate more severe symptoms and have been associated with increased fall risk in people with balance and vestibular disorders (62). The DGI was designed to measure how well individuals can ambulate under various conditions such as walking, walking around and over objects, walking with head turns, waking and turning quickly, and going up and down steps (63). DGI include eight items, each scored on a 0–3 grade with a total score of 24. Scores of 19 or less indicate increased risk of falling in older people (64).
Other outcome measures such as vestibular symptom index (VSI), vestibular rehabilitation benefit questionnaire (VRBQ), and the vertigo symptom scale (VSS) were used to assess the effects of VR in patients with VM. The VSI is designed to evaluate the severity of six vestibular related symptoms (dizziness, balance, nausea, vertigo, headache and visual sensitivity) scored on a range from 0 to 10 (0 indicates no severity and 60 indicates maximum severity) (65). The VRBQ is designed to measure dizziness, motion provoked dizziness, anxiety, and quality of life changes following VR. Each subscale is scored separately on a six-point scale in which more negative scores indicate a negative impact (66). The VSS is designed to assess both the frequency of vestibular-balance symptoms and severity of autonomic-anxiety symptoms (67). The VSS has two versions called the long version (VSS-LV) and the short form (VSS-SF). The VSS-LV comprised of 34 items and VSS-SF includes 15 items (68). The VSS-LV can be used to assess the symptom frequency over the past year, while the VSS-SF was designed to assess symptom frequency over 1 month.
Review of Vestibular Rehabilitation for Patients With VM
Search Strategy
The Web of Science and PubMed electronic databases were searched until March 11, 2018. Other possible articles were searched manually from the citation list provided with each article. The potential literature search was carried out using the following keywords: (“migraine” OR “Headache”) AND (“Vestibular symptoms” OR “Vestibular disease” OR “Vestibular disorders”) AND (“Physical therapy” OR “Physiotherapy” OR “Rehabilitation” OR “Exercise” OR “Vestibular rehabilitation” OR “Vestibular treatment”).
Quality Assessment of Included Studies
A total of five included studies (23, 25, 69–71) investigated the effects of VR in the management of VM. The critical review form for quantitative studies was used to appraise quality assessment and risk of bias in the selected studies (72). This assessment tool is applicable to the study designs of interest in the current review and is included with a detailed user guideline (72). The user is suggested to give a score of 1 if criterion achieved, and a score of 0 if not achieved, or not reported (also 0). The user is also supposed to describe the study design and whether or not the design was appropriate for the study question? (e.g., level of knowledge, ethical issues, outcomes, etc.). In addition, authors should report reliability and validity of outcome measures to fulfill the criteria of using reliable and valid outcomes (72). If the reliability and validity of an outcome measure were not discussed, the criteria were treated “not addressed,” even if such evidence actually existed. The evaluation of risk of bias is based on sample/selection bias (item # 4), measurement/detection bias (item # 7 and 8), and performance bias (item # 9 and 10) (72) (Table 2).
Table 2. Results of the quality assessment using the Critical Review Form–Quantitative Studies (72).
Effects of Vestibular Rehabilitation in VM
Based on low quality evidence, nonpharmaceutical approaches such as preventing trigger factors, regular sleep and diet, and physical therapy have been shown to be effective in treating individuals with vestibular disorders including those with VM. VR is a therapeutic approach that often includes four varieties of exercise components to reduce impairments and functional limitations in patients with vestibular dysfunction: (1) exercises to improve gaze stability (gaze stability exercises), (2) exercises to adjust the symptoms (habituation exercises), (3) exercises to enhance gait and balance (gait and balance training), and (4) walking to improve endurance (73).
Table 2 illustrates the results of the quality assessment using the Critical Review Form–Quantitative Studies (72). One-third of the included studies (70, 71) had 80 and above percentage score on the Critical Review Form. Most of the included studies had a risk of bias (23, 25, 69, 70). None of the included studies provide the justification for the sample size. Only two included studies provide information about the dropouts (70, 71).
We reviewed five studies (23, 25, 69–71) that investigated the effectiveness of VR for migraine related vestibular symptoms (Table 3). Gottshall et al. (69) reported improvement in patients with migraine-associated dizziness (migraine-related vertigo) who received vestibular physical therapy. In addition, Whitney et al. (23) reported significant improvement in functional outcomes in vestibular physical therapy in patients with migraine headaches. In contrast, Wrisley et al. (25) reported fewer patients with a VM have shown improvement in all outcome measures as compared to other vestibular patients. However, none of these studies had untreated control groups and therefore, improvement could have been from time alone (time from onset) or because they were getting attention from the therapist or because they felt that they were doing something positive that gave them a sense of control over the situation. The authors cannot be sure that these improvements were from performing vestibular exercises.
Table 3. Study characteristics.
Whitney et al. (23) investigated the effect of physical therapy for patients with a diagnosis of vestibular dysfunction with a history of a migraine headache or migraine-related vestibulopathy (MRV) using the retrospective chart review of patients seen for VR program. A tailor-made VR was designed for each patient as per their symptoms and included the following components, as needed: habituation exercises, exercises to develop vestibular compensation, balance and gait training, general strengthening and stretching exercises, exercise to improve the use of specific sensory inputs for balance control. The results of the study reported significant improvement in all outcome measures following “vestibular rehabilitation” in patients with MRV or a migraine headache. They also studied the effects of anti-migraine medications along with physical therapy intervention in those patients. The result of the study found that patients who received anti-migraine medications in combination with physical therapy intervention showed improved outcomes (23). The major weakness of this study was the absence of any comparable group as this was a retrospective case series. It was unknown, whether the improvements in the outcomes were due to intervention or because of recovery of the symptoms.
Gottshall et al. (69) investigated the effects of a VR intervention along with preventive migraine medications in all patients (idiopathic migraine-associated dizziness, benign positional vertigo with migraine-associated dizziness, and posttraumatic closed-head injury with migraine-associated dizziness) with migraine-associated dizziness. They use specific exercises designed to reduce dizziness, improve balance, and improve general activity levels. The focus of the exercise was to provide specific stimuli to train the brain for habituation or attenuation of the dizziness response. Habituation or attenuation is defined as a reduction in response as a result of repeating a provocative movement many times, as described by Norre and DeWeerdt (74). To improve balance and coordinated muscle responses, balance retraining exercises were designed. To improve general activity levels, a daily aerobic training, swimming, or cycling was given. The results of the study reported a statistically significant improvement in the DHI, balance confidence score, DGI, and dynamic posture following VR for all patients (69). However, Gottshall et al. study (69) did not include any control group (nontreated) to compare the improvement seen in treated patients group. Additionally, all patients in this study continued their migraine preventive medication. Therefore, it is difficult to isolate the possible therapeutic effects of interventions and other general effects that might affect the result of the study.
Wrisley et al. (25) assessed the effect of VR using the retrospective chart review of 30 patients with or without a history of a migraine. Both the groups received a customized VR program for an average of 4.1 visits over an average duration of 3.3 months. The exercise program consisted of general strengthening and stretching exercises, canalith repositioning technique, habituation training, exercises to enhance vestibular compensation, and exercise to encourage the use of various sensory inputs to improve balance control. Patients were asked to complete the DHI, ABC Scale, DGI, and the Timed Up and Go Test. They reported clinically significant improvements in balance measures following physical therapy in vestibular disorders with or without a history of a migraine. Additionally, they found the greater perception of disability from dizziness in patients with a history of a migraine as compared to patients without a history of a migraine. The major weakness of this study was the absence of any randomly selected comparable group. Although there was a comparison group (people who didn't have migraine receiving physical therapy), it was not randomly selected as it was also a retrospective group. Therefore, it was not confirmed, whether the improvements in balance measures were due to VR or just recovery of the symptoms. In addition, the other problem with retrospective studies is that there can be bias in the data collection (outcome measures) and a lack of control over the treatments.
Recently, Vitkovic et al. (70) validated the use of VR in individuals with vestibular disorders with (VM+VI) or without (VI) a history of a migraine. All patients underwent clinical vestibular assessment, including caloric and cervical vestibular evoked myogenic potential testing to evaluate cochlear, audiometry, lateral semicircular canal and otolith function in each ear. To evaluate improvements in underlying vestibular function, a repeat testing was done between the 9-week and 6 months. A tailor-made home exercise program enough to aggravate moderate dizziness was designed for each patient. The exercise program consisted of gaze stability, static tilt, habituation, gait and balance training. These authors found heightened perception of symptoms in VM + VI patients as compared to vestibular impaired (VI) patients. Still, the VM + VI patients reported the same amount of benefit from physical therapy as VI patients in both objective and subjective measures (70). However, these authors suggested that VM + VI patients may require prolonged physical therapy to gain an acceptable level of symptoms equivalent to another group of patients at the end of rehabilitation. So the presence of VM did not prevent recovery but it may have slowed recovery. Additionally, the role of behavioral therapies along with physical therapy is important to encourage exercise compliance and providing more emotional support in these patients (70). Rehabilitation professionals treating patients with VM may encounter additional challenges in motivating exercise adherence and give extra emotional support (70). Specifically, consoling that improvement is being made despite having high levels of anxiety (75) and motion intolerance (76).
In a recent study (71), 251 patients with dizziness, including 28 patients with VM (Group 1), 144 patients without a headache (Group 2), and 79 patients with a tension-type headache (Group 3) participated in 5-day hospital-based VR. They divided all the patients into three groups: (1) VM group [patients with VM having a current headache and the Headache Impact Test (HIT) score ≥50], (2) tension-type headache group (patients with chronic and episodic tension-type headache and the HIT score ≥50), and (3) non-headache group (patients with VM without having a current headache and the HIT score ≤ 49). The HIT is comprised of 6 items designed to assess the impact of headaches on a patient's life. Four sub-groups have been divided for the interpretation of HIT scores: scores ≤ 49 indicate little or no impact, scores between 50 and 55 indicate some impact, scores between 56 and 59 indicate substantial impact, and scores ≥60 suggest severe impact (77). In this study, a group of 8–10 individuals were taught a 30-min VR program. The exercise program included repeated training of the vestibulo-spinal reflexes (VSR) and vestibulo-ocular reflex (VOR). The VSR training included static and dynamic exercises. Static exercises were: standing up and sitting down with eyes open and eyes closed, three times; standing with feet apart and eyes closed for 20 s; (4) standing with feet together and eyes closed for 20 s; standing in tandem with alternate foot position for 20 s; and single leg standing on the alternate foot for 20 s. Dynamic exercises were: 180° body turn to the left and right, three times; tandem gait walking for 10 m; and walking with head shaking (horizontal and vertical) for 10 m. The oculomotor and VOR exercise program included as follows: quick eye movement (horizontal and vertical), eye tracking (horizontal and vertical direction), and head shaking with gaze fixed target (horizontal, vertical, and oblique). Each head or eye movement was repeated for 20 times. The participants were evaluated using the DHI, HIT, and Hospital Anxiety and Depression Scale (HADS) at baseline, 1 and 4 months after their intervention. Patients with VM, dizziness and tension-type headache demonstrated a significantly improved headache, dizziness, and psychological factors following VR (71). However, the inclusion of heterogeneous groups of patients in this study limits the validity of results. Thus, further research is needed to justify using VR to reduce vestibular symptoms in these patients.
Conclusions
From the current evidence, studies on the role of vestibular exercises in improving subjective complaints and balance in patients with VM are inconclusive. Although all studies demonstrated improvement, most of the studies do not have a control group and the subjects often had other diagnoses. Additionally, not all studies were preformed prospectively. Therefore, more randomized controlled studies are required to make firm evidence on the effect of VR in reducing vestibular symptoms in patients with VM.
Author Contributions
AA and SA significant contribution to the concept and design of the study. SA the corresponding author, drafted, analyzed, and completed the manuscript. AA revised the manuscript critically. Both the authors read and approved the final manuscript.
Conflict of Interest Statement
The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
Acknowledgments
The authors are grateful to the Deanship of Scientific Research, King Saud University for funding through Vice Deanship of Scientific Research Chairs.
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Keywords: dizziness, migraine, physical therapy, vestibular rehabilitation, vertigo
Citation: Alghadir AH and Anwer S (2018) Effects of Vestibular Rehabilitation in the Management of a Vestibular Migraine: A Review. Front. Neurol. 9:440. doi: 10.3389/fneur.2018.00440
Received: 17 January 2018; Accepted: 24 May 2018;
Published: 12 June 2018.
Edited by:
Susan J. Herdman, Emory University, United StatesReviewed by:
Dario Andres Yacovino, Department of Neurology, Dr. César Milstein Hospital, ArgentinaJennifer Christy, University of Alabama at Birmingham, United States
Copyright © 2018 Alghadir and Anwer. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
*Correspondence: Shahnawaz Anwer, anwer_shahnawazphysio@rediffmail.com