scholarly journals Vestibular-evoked myogenic potential: an easy neurophysiological tool for evaluating brain stem involvement in multiple sclerosis

2018 ◽  
Vol 34 (2) ◽  
pp. 144
Author(s):  
Rabab Koura ◽  
Mona Hussein
Keyword(s):  
Multiple Sclerosis ◽  
Brain Stem ◽  
Vestibular Evoked Myogenic Potential ◽  
Myogenic Potential

Vestibular Evoked Myogenic Potential Findings in Multiple Sclerosis

2013 ◽  
Vol 64 (5) ◽  
pp. 352-358 ◽  
Author(s):  
Vicente Escorihuela García ◽  
Ignacio Llópez Carratalá ◽  
Miguel Orts Alborch ◽  
Jaime Marco Algarra
Keyword(s):  
Multiple Sclerosis ◽  
Vestibular Evoked Myogenic Potential ◽  
Myogenic Potential

scholarly journals Vestibular Evoked Myogenic Potential in Multiple Sclerosis (MS)

2020 ◽  
Vol 0 (0) ◽  
pp. 0-0
Author(s):  
Iman Eladawy ◽  
Amal Beshr ◽  
Reda Behairy ◽  
Alaa Ameen
Keyword(s):  
Multiple Sclerosis ◽  
Vestibular Evoked Myogenic Potential ◽  
Myogenic Potential

Dorsolateral Medullary Infarction: A Neurogenic Cause of a Contralateral, Large-Amplitude Vestibular Evoked Myogenic Potential

2008 ◽  
Vol 19 (03) ◽  
pp. 246-256 ◽  
Author(s):  
Larry Lundy ◽  
David Zapala ◽  
Ketil Olsholt
Keyword(s):  
Brain Stem ◽  
Vestibular Nuclei ◽  
Vestibular Nerve ◽  
Vestibular Evoked Myogenic Potential ◽  
Lateral Medullary Infarction ◽  
Myogenic Potential ◽  
Inferior Vestibular Nerve ◽  
Dorsolateral Medullary Infarction ◽  
Contralesional Side ◽  
Medullary Infarction

The vestibular evoked myogenic potential (VEMP) has become a useful tool to assess the saccule and inferior vestibular nerve function. Vestibulopathies involving the saccule or inferior vestibular nerve typically result in VEMP responses that are diminished or absent on the involved side. Abnormally large VEMPs are rare. Large VEMPs have been associated with superior canal dehiscence, Ménière's disease, and labyrinthine fistula. In all of these cases, the abnormally large VEMP can be explained on the basis of labyrinthine hydromechanical changes that result in excessive saccular displacement in response to intense sound. In this report, a case is presented of a 74-year-old male with dorsal lateral medullary infarction (Wallenberg's syndrome) who presented with an enlarged VEMP—a finding that has not been reported to date as a result of a brain stem lesion. Particularly perplexing, the enlarged VEMP was on the contralesional side. A proposed mechanism of contralateral vestibular nuclei disinhibition secondary to the brain stem stroke is discussed. El potencial miogénico vestibular evocado (VEMP) se ha convertido en una herramienta útil para evaluar el sáculo y la función del nervio vestibular inferior. Las vestibulopatías que involucran el sáculo y el nervio vestibular inferior típicamente generan respuestas del VEMP que están disminuidas o ausentes en lado involucrado. Los VEMP anormalmente grandes son raros. Los VEMP grandes se han asociado con dehiscencia del canal superior, con enfermedad de Ménière y con fístula del laberinto. En todos estos casos, el VEMP anormalmente grande puede explicarse sobre la base de cambios hidromecánicos del laberinto, que producen un desplazamiento excesivo del sáculo, en respuesta a un estímulo sonoro intenso. En este reporte, se presenta un caso de un hombre de 74 años de edad con un infarto medular dorsolateral (Síndrome de Wallenberg), quien mostró un VEMP grande—un hallazgo que a la fecha no ha sido reportado como resultado de una lesión del tallo cerebral. Sorprendentemente, el VEMP agrandado estaba en el lado contrario a la lesión. Se discute un mecanismo propuesto de desinhibición de los núcleos vestibulares contralaterales, producto de la apoplejía en el tallo cerebral.

The N3 potential compared to sound and galvanic vestibular evoked myogenic potential in healthy subjects and in multiple sclerosis patients

2007 ◽  
Vol 17 (1) ◽  
pp. 39-46 ◽  
Author(s):  
Maurizio Versino ◽  
Laura Ranza ◽  
Silvia Colnaghi ◽  
Roberto Alloni ◽  
Roberto Callieco ◽  
...  
Keyword(s):  
Multiple Sclerosis ◽  
Healthy Subjects ◽  
Reference Range ◽  
Evoked Response ◽  
Vestibular Evoked Myogenic Potential ◽  
Auditory Evoked Response ◽  
Myogenic Potential ◽  
The Mean ◽  
The Right ◽  
Multiple Sclerosis Patients

Both sound (s-) and galvanic (g-) vestibular-evoked myogenic potential (VEMP) enable us to study the saccular pathways. However, the VEMP can be abnormal for non-vestibular factors, such as insufficient activation of the sterno-cleido-mastoid (SCM) muscle or a lesion that involves the accessory nucleus and/or nerve or the SCM muscle. These drawbacks do not affect another technique that evaluates the saccular function: the N3 potential. We recorded both the s- and the g-VEMP and the N3 potential in a group of 31 healthy subjects to establish a reference range. The N3 potential and the s-VEMP were recordable bilaterally from all the subjects, whereas the g-VEMP was undetectable uni- or bilaterally in 7 subjects. The latency and amplitude values of the s-VEMP did not differ from those of the g-VEMP. For all three techniques, the latency and amplitude values from the right and from the left recording and/or stimulation side were the same. We suggest using normative latency and amplitude values based on the mean and ratio of the right- and left-side values. The s-VEMP, the N3 potential and the auditory evoked response (ABR) were compared in 15 subjects suffering from multiple sclerosis. The three techniques detected a similar number of abnormalities, but these abnormalities were not correlated. This suggests that these different techniques should be regarded as complementary in evaluating saccular function.

Quantifying the effects of electrode placement and montage on measures of cVEMP amplitude and muscle contraction

2020 ◽  
pp. 1-13
Author(s):  
Sendhil Govender ◽  
Sally M. Rosengren
Keyword(s):  
Muscle Contraction ◽  
Normal Subjects ◽  
Electrode Placement ◽  
Electrode Position ◽  
Test Results ◽  
Vestibular Evoked Myogenic Potential ◽  
Active Electrode ◽  
Myogenic Potential ◽  
Position Errors ◽  
Test Outcomes

BACKGROUND: The cervical vestibular evoked myogenic potential (cVEMP) can be affected by the recording parameters used to quantify the response. OBJECTIVE: We investigated the effects of electrode placement and montage on the variability and symmetry of sternocleidomastoid (SCM) contraction strength and cVEMP amplitude. METHODS: We used inter-side asymmetries in electrode placement to mimic small clinical errors in twenty normal subjects. cVEMPs were recorded at three active electrode sites and referred to the distal SCM tendon (referential montages: upper, conventional and lower). Additional bipolar montages were constructed offline to measure SCM contraction strength using closely-spaced electrode pairs (bipolar montages: superior, lower and outer). RESULTS: The conventional montage generally produced the largest cVEMP amplitudes (P <  0.001). SCM contraction strength was larger for referential montages than bipolar ones (P <  0.001). Inter-side electrode position errors produced large variations in cVEMP and SCM contraction strength asymmetries in some subjects, producing erroneous abnormal test results. CONCLUSION: Recording locations affect cVEMP amplitude and SCM contraction strength. In most cases, small changes in electrode position had only minor effects but, in a minority of subjects, the different montages produced large changes in cVEMP and contraction amplitudes and asymmetry, potentially affecting test outcomes.

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