Download or read book Vestibular Evoked Myogenic Potential written by Toshihisa Murofushi and published by Springer Science & Business Media. This book was released on 2009-03-28 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt: The vestibular labyrinth consists of ? ve compartments: the lateral, anterior, and posterior semicircular canals, the utricule, and the saccule. At the beginning of the twentieth century, Robert Bárány proposed the caloric test as a clinical test of the lateral semicircular canal. This test enabled clinicians to assess the individual lateral semicircular canal function easily by using the simple method of irrigating the external ear canal with cold or warm water and observing the induced nyst- mus. We believe that the caloric test was a breakthrough in the ? eld of vestibular research. However, as far as the other compartments were concerned, there was no simple clinical test equal to the caloric test for the lateral semicircular canal function. At the end of the twentieth century, the vestibular evoked myogenic potential (VEMP) test was proposed as a new method for assessing the individual saccule function. This test has some unique attributes. First, it uses sound stimulation, even though it is a test of the vestibular system. This appears to be a contradiction n- rophysiologically. As a result, in its early stages there were controversies conce- ing the origin of the responses. However, such controversies have been overcome by basic neurophysiological studies and clinical studies. Above all, sound sensit- ity of the saccular afferents shown in cats and guinea pigs with single-unit recording methods became the main supporting evidence. Nowadays, VEMP is one of the routine clinical tests for balance disorder.

Download or read book Fundamentals of Vestibular Evoked Myogenic Potentials written by Sujeet Kumar Sinha and published by . This book was released on 2022-08-05 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Vestibular-evoked myogenic potentials(VEMPs) are essential in assessing the otolith function in individuals with various vestibular disorders. There are three types of vestibular evoked myogenic potentials: cervical vestibular evoked myogenic potentials, ocular vestibular evoked myogenic potentials, and masseter vestibular evoked myogenic potentials are recorded in various clinical settings. The book Fundamentals of Vestibular Evoked Myogenic Potentials covers all the information related to all three types of VEMPs. The book has eighteen chapters containing information on recording, factors affecting and applications of VEMPs in various vestibular pathologies such as Meniere's disease, Labyrinthitis, BPPV, NIHL, vestibular neuritis, third window syndrome, congenital sensorineural hearing loss, ototoxicity, vestibular Schwannoma and diseases of the central nervous system.

Download or read book Vestibular Evoked Myogenic Potentials in Clinical Applications written by Alexsandra Ostrovska and published by . This book was released on 2004 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt: "It is uncertain whether clinically useful information of otolith function can be well characterized by vestibular-evoked-myogenic-potentials (VEMPs), i.e., electromyogenic activity recorded from sternomastoid muscles in response to brief loud auditory clicks. We aimed to assess the utility of VEMP testing in the differential diagnosis of dizziness (81 dizzy patients, 12 normals). We found that: (1) VEMP was reliably elicited from all controls and from 96% of patients without loss of vestibular function; (2) in patients with documented unilateral peripheral vestibular disorders, VEMP could reveal loss of otolith function that usefully facilitated diagnoses; and (3) such otolith function loss was independent of canal function loss revealed by caloric testing. We conclude that the VEMP-test is clinically useful to assess vestibular (otolith and/or inferior vestibular nerve) function, providing information complementary to that obtained from caloric testing (horizontal semicircular canal and/or superior vestibular nerve function)." --

Download or read book Evaluation of Vestibular Evoked Myogenic Potentials VEMP and Ocular Torsion written by Jessica A. Godovin and published by . This book was released on 2012 with total page 142 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Just Noticeable Difference of Rise and Fall Times for Vestibular Evoked Myogenic Potentials written by Cara Makuta and published by . This book was released on 2010 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this study was to assess whether the rise/fall time of the stimulus had a significant effect on the peak latency and the interpeak amplitude measurements of the Vestibular Evoked Myogenic Potentials (VEMPs).

Download or read book Vestibular Evoked Myogenic Potential Measures in Adolescents written by Reaghan Albert and published by . This book was released on 2014 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Acquisition of Vestibular Evoked Myogenic Potentials written by Steven Hagiannis and published by . This book was released on 1997 with total page 214 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Vestibular Evoked Myogenic Potentials VEMPs written by Robby Vanspauwen and published by . This book was released on 2009 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Physical Activity and Vestibular Evoked Myogenic Potentials in Younger and Older Aduts written by Kristen Diane Benjaminson and published by . This book was released on 2017 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Normative Study on the Click Vestibular Evoked Myogenic Potential written by Sasha T. Phillips and published by . This book was released on 2013 with total page 127 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Vestibular Evoked Myogenic Potentials written by Srinivasamurthy Ravi Prakash and published by . This book was released on 2009 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt: (cont.) In the second part of the thesis, we develop a computational model of VEMP physiology, and use the model to separate external sources of variability from internal noise. The model outputs are also used to define a statistical measure, the inverse coefficient of variation (iCOV), which correlates with altered vestibular sensitivity, but is relatively robust to other changes. When applied to the experimental data, the iCOV is found to yield estimates of vestibular sensitivity that are more stable than the conventional VEMP amplitude. This measure also reveals a diversity of response threshold and growth characteristics within the clinically normal population. These findings suggest that the proposed approach could lead to the development of an improved clinical tool, but could also yield new insights into the physiological mechanisms of vestibular pathology.

Download or read book Vestibular Evoked Myogenic Potentials The Influence of Head Position for Click and Toneburst Stimuli written by Rebecca J. Price and published by . This book was released on 2007 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt: Although the Vestibular Evoked Myogenic Potential (VEMP) was discovered nearly fifty years ago, clinical interest in the vestibular evoked potential has only recently resurfaced. Since the VEMP is a relaxation potential, it is important to investigate stimulus and parameter characteristics in order to minimize variability among the recordings and maximize clinical benefit. The present study aims to determine what effect head position, bandwidth, and ear stimulated have on the VEMP recordings. The present study will also correlate the relationship between test and re-test reliability for VEMP amplitude and latency measures. Twenty normal hearing (defined as ≤ 15 dB HL for frequencies 250-8000 Hz) females with no current or previous history of otologic and/or vestibular dysfunction were enrolled in the study. Participants underwent serial VEMP testing utilizing four different head positions: Head Rotation, Head Rotation with Forward Tilt, Head Rotation with Backward Tilt, and Head on Chin. A 95 dB nHL 100 musec click and 500 Hz toneburst stimuli were utilized to elicit a VEMP for each head position. For each test condition, a VEMP response was recorded twice. Intensity was decreased in 10 dB steps until threshold was reached. Threshold was defined as the lowest intensity level where a VEMP recording was repeated. Both the right and left ears were stimulated monaurally for all participants. Condition order was randomized for head position, bandwidth, and ear to counterbalance order effect. For all VEMP recordings, absolute amplitude and latency measures for P1, N1, and P2 recorded. Absolute threshold was also documented. Interaural threshold measures were also calculated for analysis. Results demonstrated high test re-test reliability between VEMP recordings. There was no significant ear effect for amplitude or latency measures. A significant bandwidth effect was found with the 500 Hz toneburst stimuli producing larger amplitude and unanticipated longer latencies than the 100 musec click stimuli for P1, N1, and P2 measurements. Lower absolute thresholds were also noted when utilizing the 500 Hz toneburst stimulus. Head position was also shown to have a significant effect on VEMP recording, with the Head Rotation and Head on Chin conditions producing larger amplitudes for P1, N1, and P2 than the other two head positions. P1 latency did not demonstrate a significant head position effect. However, slightly longer N1 latencies were found for the Head Rotation and Head on Chin conditions. Slightly longer P2 latencies were documented for the Head Rotation with Forward Tilt and Backward Tilt, respectively. The Head Rotation and Head on Chin conditions produced lower thresholds than the remaining two conditions.

Download or read book Ocular Vestibular Evoked Myogenic Potentials Using Head Striker Stimulation written by Y. E. De Dios and published by . This book was released on 2016 with total page 1 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Normative Data Study on Vestibular Evoked Myogenic Potential written by Tin Duc Truong and published by . This book was released on 2015 with total page 63 pages. Available in PDF, EPUB and Kindle. Book excerpt: Vestibular evoked myogenic potential is a specialized test within the vestibular test battery that specifically examines the integrity of the otolithic organs within the inner ear. The way in which the test is executed varies between individual clinics. Therefore, it is important for each individual clinic to establish its own set of normative data that are unique to their chosen recording and stimulus parameters. The goal of this current study is to establish normative data for cervical and ocular vestibular myogenic evoked potential tests at the Towson University Hearing and Balance clinic.

Download or read book The Use of 64 channel Electroencephalography and Positron Emission Tomography to Study Vestibular Evoked Myogenic Potentials written by Kathleen Szalda McNerney and published by . This book was released on 2007 with total page 199 pages. Available in PDF, EPUB and Kindle. Book excerpt: The vestibular evoked myogenic potential (VEMP) is a response that can be recorded from the sternocleidomastoid (SCM) muscle in response to either clicks or low-frequency tonebursts that are presented at a high stimulus level. The VEMP is most likely generated by the saccule. The saccule is part of our vestibular system, and normally contributes to our sense of balance. However, recent studies have shown that it is also responsive to sound. The exact neural pathway of the VEMP is not yet fully understood, limiting its clinical application. The present study has identified the areas of the brain that are activated by stimuli used clinically to evoke the VEMP, by utilizing both EEG (brain electrical activity) recordings, as well as functional imaging, which were collected separately. Stimuli consisted of 500 Hz tonebursts. Analysis of event related potentials (ERPs) derived from EEG recordings revealed that the responses to the 90 dB pSPL stimuli were absent or smaller than the responses that were recorded in response to the 120 dB pSPL stimuli. We recorded an initial negative-going peak which occurred at 13.5 ms, with the frontal electrodes producing the largest response amplitude, as well as a later positive-going peak which occurred at 20.5 ms, with the occipital electrodes and the electrodes which were placed over the right temporal lobe producing the largest amplitude. Source localization techniques (CURRY) were used to analyze the EEG data, while both PET and EEG data were analyzed using SPM5. When we compared the areas activated by the high vs. low-level stimuli, we found that the VEMP stimuli activated vestibular regions of the brain, specifically the premotor cortex, the inferior and medial temporal gyri, and Brodmann area 40, in addition to the auditory areas typically activated by sound, such as the primary auditory cortex. In addition, the brain activity for the initial negative-going peak was localized in the primary visual cortex, as well as the precuneus. In conclusion, several brain regions were activated in response to stimuli that are used clinically to evoke the VEMP. We believe that these areas are representative of the neural correlates of the VEMP.

Download or read book Vestibular Evoked Potentials written by Claude Bernard Hoffmeyer and published by . This book was released on 1981 with total page 82 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Effects of Body Position and Visual Fixation on the Vestibular Evoked Myogenic Potential written by and published by . This book was released on 2007 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt: