Video head impulse testing in patients with benign paroxysmal positional vertigo

Clinical observations from the clinical video head pulse test in patients with idiopathic horizontal semicircular canal light cupula

Objective

The objective of the study is to analyze and explore the characteristics of the video head impulse test (vHIT) for light cupula in the idiopathic horizontal semicircular canal and compare them with those of horizontal semicircular canal cupulolithiasis (HC-cu) in order to investigate the potential mechanism involved.

Methods

Data from 51 cases of idiopathic light cupula and 42 cases of horizontal semicircular canal cupulolithiasis were retrospectively analyzed. The positional nystagmus features, vHIT anomaly rate, gain value, saccades, and other indicators were compared. SPSS 26 and Medcalc 22 were used to analyze the differences and correlations.

Results

There were no differences in sex, age, the affected side, and positional nystagmus between the light cupula group and HC-cu group (p > 0.05). The overall abnormal rate of the vHIT (56.86% vs. 21.43%), the abnormal rate of the affected side (23.53% vs. 0.00%), and the saccade ratio of the affected side [40.0 (13.0, 76.0) vs. 6.0 (0.0, 15.0)] in the light cupula group were higher than those in the HC-cu group. The HC saccade ratio in the light cupula group was higher on the affected side than on the healthy side [40.0 (13.0, 76.0) vs. 11.0 (0.0, 38.0)], and the differences were statistically significant (p < 0.05). The receiver operating characteristic (ROC) curve analysis showed that the abnormal vHIT results and saccade ratio of the light cupula group were correlated with the affected side (p < 0.05).

Conclusion

The vHIT results of idiopathic HC light cupula and HC-Cu were different as they are distinct diseases. Light cupula may be associated with some mild lesions in the vestibulo-ocular reflex (VOR) pathway. The lighter cupula theory is the possible mechanism.

Vestibular migraine as a mimic of benign paroxysmal positioning vertigo and Meniere's disease

BACKGROUND

Vestibular migraine (VM) is a common cause of recurrent spontaneous and positional dizziness of varying durations. Short episodes of VM lasting seconds to minutes, triggered by changes in head position can resemble those of benign paroxysmal positioning vertigo (BPPV), while episodes lasting minutes to hours can mimic those of Meniere's disease (MD).

OBJECTIVE

We aimed to compare symptoms and vestibular test results in patients with VM, BPPV and MD, where VM was categorized by episode duration.

METHODS

We compared vestibular, aural and migraine symptoms, as well as cervical and ocular vestibular evoked myogenic potentials and 3D video head impulse tests, in 108 patients: 24 with BPPV, 33 with VM episodes of short duration (<10 min), 29 with VM of medium duration (≥10 min) and 22 with MD.

RESULTS

We found significant overlap in the symptoms of all patient groups, and no significant differences between patients with short and medium VM. Abnormal test results occurred infrequently in all groups.

CONCLUSIONS

Our results confirm significant symptom overlap between BPPV or MD and VM, and suggest that VM mimics other conditions when the episode duration matches the differential diagnosis, rather than because patients with different durations of vertigo have different symptoms.

Resolution of atypical posterior semicircular canal BPPV: evidence for putative short-arm location

This case demonstrates the successful identification and treatment of atypical posterior semicircular canal benign paroxysmal positional vertigo (BPPV) based on a unique presentation of positional nystagmus, the resultant nystagmus from repositioning manoeuvers, and restored function of the affected semicircular canal. This case illustrates the importance of completing a comprehensive clinical examination and the value for incorporating the video head impulse test as well as adjusting treatment based on testing and patient response when managing variant cases of BPPV.

Spontaneous Nystagmus in Patients With Posterior Semicircular Canal Benign Paroxysmal Positional Vertigo

OBJECTIVE

This study aimed to investigate the incidence of spontaneous nystagmus (SN) in posterior semicircular canal (PSCC) benign paroxysmal positional vertigo (BPPV) and its effect on treatment outcomes.

STUDY DESIGN

Retrospective case series.

SETTING

Tertiary referral center.

METHODS

This study included 50 patients with idiopathic unilateral PSCC BPPV between July 2021 and May 2022. The presence of SN was investigated, and the results of the bithermal caloric test and video head impulse test (vHIT) were compared.

RESULTS

SN was observed in 13 (26%) of the 50 patients presenting PSCC BPPV. The direction of SN was mainly unidirectional and horizontal in 12 of the 13 patients with a slow-phase velocity ranging from 2 to 4°/s. One patient presented an upbeating torsional SN at the initial evaluation. The mean vHIT gain of the PSCC on the affected side was significantly lower in patients with SN than those without SN (p = .004, Mann-Whitney U test). The proportion of patients who recovered within 2 sessions of the repositioning maneuver was significantly higher in those without SN than that in those with SN (p < .001, Fisher's exact test).

CONCLUSION

This study demonstrated that the treatment outcomes of PSCC BPPV were significantly worse in patients with SN than those without SN. Examining the presence of SN in patients with PSCC BPPV may be helpful in counseling the patients on prognosis, and it is expected that more sessions of canalith repositioning maneuver may be required to treat PSCC BPPV in patients with SN than those without SN.

Assessment of semicircular canal function in benign paroxysmal positional vertigo using the video head impulse test and caloric test

Objective

To assess semicircular canal function in benign paroxysmal positional vertigo (BPPV) using the video head impulse test (vHIT) and caloric test.

Methods

We retrospectively reviewed 39 patients with idiopathic BPPV who underwent both vHIT and the caloric test. Twenty-one patients had posterior BPPV (p-BPPV) and eighteen had horizontal BPPV (h-BPPV). Vestibulo-ocular reflex (VOR) gain and corrective saccades (CS) were analyzed in vHIT and canal paresis (CP) was calculated in the caloric test.

Results

The mean VOR gain of the posterior canal in p-BPPV was 0.75 ± 0.28 on the affected side, which was significantly smaller than that on the contralateral side (0.93 ± 0.24, p = .00738). On the other hand, there were no significant differences in the VOR gain of the horizontal canal in h-BPPV between the affected and the contralateral sides (p = .769). The rates of the presence of CS were not significantly different between the affected canal and the contralateral canal either in p-BPPV (p = .111) or h-BPPV (p = .0599). The mean CP value in h-BPPV patients (43.5 ± 31.3%) was significantly higher than that in p-BPPV patients (22.2 ± 22.9%; p = .0184).

Conclusion

The VOR gain of vHIT in the affected canal was significantly smaller than that in the contralateral canal in p-BPPV, but not in h-BPPV. The caloric responses of the affected canal are reduced to a significantly larger extent in h-BPPV compared to p-BPPV. These results suggest that BPPV affects the semicircular canal function differently depending on which semicircular canal is involved.

Differential screen and treatment of vestibular dysfunction in an elderly patient: A case report

BACKGROUND/PURPOSE

Concussion sequelae in the elderly is under recognized and negatively impacts quality of life. Labyrinthine concussion (LC) is an uncommon diagnosis, as is multiple canal (MC) benign paroxysmal positional vertigo (BPPV). This case report highlights physical therapist (PT) evaluation and treatment of an elderly male misdiagnosed with LC and successfully treated for MC BPPV.

CASE DESCRIPTION

A 72 year old male presented to his PT 23 days after falling off a ladder, resulting in a mild traumatic brain injury (mTBI). Diagnosed with LC, he was referred to PT due to ongoing symptoms of "falling backwards," poor gait, and diminished mobility. PT examination revealed an atypical BPPV. Thus, the patient was treated in two PT visits, which included canalith repositioning techniques and neuromuscular reeducation.

OUTCOMES

The PT diagnosis was MC BPPV, including the right lateral and left posterior semicircular canals. Initial positive findings of Head Impulse Test, Bow and Lean Test, Dix-Hallpike, and Roll Test were negative on the last visit. Patient-Specific Functional Scale improved from 0 to 9.9 (10 being no limitations). The patient progressed from minimum assistance to independence in bed mobility, transfers, gait, and previous activities.

DISCUSSION

The patient's presentation was atypical in signs and symptoms with a diagnosis of LC. PT examination and intervention successfully resolved the patient's signs and symptoms within two visits. Further research is needed regarding identification and treatment of elderly individuals with head injuries, such as MC BPPV, as well as the efficacy of a PT seeing patients shortly after mTBI.

Video Head Impulse Test Findings in Patients With Benign Paroxysmal Positional Vertigo Secondary to Idiopathic Sudden Sensorineural Hearing Loss

Benign paroxysmal positional vertigo (BPPV) is amongst the most common causes of episodic vestibular syndrome. It can be classified as idiopathic and secondary types according to the causative factors, and the underlying mechanism between idiopathic (i-BPPV) and secondary BPPV (s-BPPV) may differ. Idiopathic sudden sensorineural hearing loss (ISSNHL) has been considered as a common inner ear disease that precipitates s-BPPV. Yet, few studies have addressed the functional impairment of the semicircular canal (SCC) system in patients with s-BPPV associated with ISSNHL. Our purpose was to explore the pathophysiological mechanism and investigate the clinical implications of video head impulse test (vHIT) in these patients. Here, the clinical and laboratory data of patients with BPPV secondary to ISSNHL, including the results of vHIT, were retrospectively reviewed, and compared with those of patients with i-BPPV. Pathological vHIT findings (low vestibulo-ocular reflex gain and re-fixation saccade), which mainly affected the posterior SCC, were more common in the s-BPPV group than in the i-BPPV group (41.9 and 0%, respectively). The incidence of horizontal SCC involvement was also higher in the s-BPPV group (45.16 and 16.67%, respectively). Furthermore, patients with s-BPPV showed lower vHIT gains of the posterior and horizontal SCCs in affected ears than in unaffected ears. Compared to i-BPPV, posterior SCC paresis detected by vHIT is more prevalent in BPPV secondary to ISSNHL. This dysfunction may be associated mainly with vestibular impairments caused by ISSNHL, and not with BPPV per se.

Vestibular function testing in the 21st century: video head impulse test, vestibular evoked myogenic potential, video nystagmography; which tests will provide answers?

PURPOSE OF REVIEW

To most neurologists, assessing the patient with vertigo is an unpleasant and worrisome task. A structured history and focused examination can be complemented by carefully selected laboratory tests, to reach an early and accurate diagnosis. We provide evidence-based recommendations for vestibular test selection.

RECENT FINDINGS

The video head impulse test (vHIT), cervical and ocular vestibular evoked myogenic potential (VEMP) and home-video nystagmography are four modern, noninvasive methods of assessing vestibular function, which are equally applicable in the hospital and office-practice. Collectively, they enable assessment of all five vestibular end-organs. The prevalence and patterns of test abnormalities are distinct for each vestibular disorder. We summarize typical abnormalities encountered in four common vestibular syndromes.

SUMMARY

In the context of acute vestibular syndrome, an abnormal vHIT with low gain and large amplitude refixation saccades and an asymmetric oVEMP separates innocuous vestibular neuritis from stroke. In episodic spontaneous vertigo, high-velocity ictal nystagmus and asymmetric cVEMP help separate Ménière's disease from vestibular migraine. In chronic imbalance, all three tests help detect unilateral or bilateral vestibular loss as the root cause. Recurrent positional vertigo requires no laboratory test and can be diagnosed and treated at the bedside, guided by video nystagmography.

Clinical significance of video head impulse test in benign paroxysmal positional vertigo: a meta-analysis

PURPOSE

To document the effect of cupula deflection in Benign Paroxysmal Positional Vertigo (BPPV) through the measured Vestibulo-Ocular Reflex (VOR) gain in individual semi-circular canals.

METHODS

A literature search using the Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines was performed on December 30, 2020. The following terms were entered in the title, abstract, and keywords in the electronic databases of PubMed, Scopus, Web of Science, and Cochrane Library search engines in different combinations: "Benign Paroxysmal Positional Vertigo" or "Benign Positional Vertigo" or "BPPV," and "Video Head Impulse" or "vHIT". All types of studies were included in the initial search. An additional inclusion criterion was the presence of numerical values of VOR gains of the tested canals in the reports.

RESULTS

A total of 122-screened articles were obtained from the electronic database search. Finally, the authors settled on five original articles for meta-analysis with a total of 168 patients (123 with posterior canal BPPV, 28 with lateral canal BPPV, and 17 with anterior canal BPPV) and 85 controls. The main outcomes of these studies comprised the VOR gains of the lateral, posterior, and anterior SCCs on the affected side relative to that in the contralesional side, and/or healthy controls.

CONCLUSION

This meta-analysis shows that vHIT can be valuable as a supporting test in the diagnosis of BPPV, especially for posterior canal BPPV.