The Experts below are selected from a list of 1029 Experts worldwide ranked by ideXlab platform
Devin L. Mccaslin - One of the best experts on this subject based on the ideXlab platform.
-
Oculomotor Assessment in Children.
Seminars in hearing, 2018Co-Authors: Steven M. Doettl, Devin L. MccaslinAbstract:Oculomotor evaluation as part of Videonystagmography is an integral tool in the assessment of vestibular function providing a global assessment of the neurological pathways associated with oculomotor function. The value of an oculomotor evaluation for pediatric evaluation is well established; however, many questions can also arise with the application to the pediatric population. Oculomotor function is age dependent which can have a significant effect on the test results obtain in children. The underlying neural substrates and age effects are discussed across the literature with specific results from recent research using clinical oculomotor equipment and protocols. The evidence suggests there are several key differences in the pediatric population compared with adults. These include longer saccade latencies, reduced smooth pursuit gain, increased optokinetic asymmetry, increased variability in all responses, and increased artifact in saccade and smooth pursuit testing.
-
Artifact in Pediatric Oculomotor Findings during Videonystagmography: A Retrospective Analysis.
Journal of the American Academy of Audiology, 2017Co-Authors: Steven M. Doettl, Patrick N. Plyler, Devin L. MccaslinAbstract:Background Accurate measurement of oculomotor function using Videonystagmography (VNG) is imperative for diagnosis and management of patients with reported dizziness. The oculomotor evaluation during VNG utilizes video-oculography providing valuable information regarding the central structures and pathways that control eye movements. Artifact may have an effect on the overall validity and reliability of VNG oculomotor tracings and can result from patient and/or recording errors. It is postulated that artifact could occur more frequently in the pediatric population due to both patient and equipment factors. Purpose The purpose of this study was to systematically evaluate the occurrence and impact of artifact on saccades, smooth pursuit, and optokinetic (OPK) testing in normal pediatric and adult subjects using commercially available clinical VNG equipment and standard clinical protocols for oculomotor testing. Research design The present study utilized a retrospective analysis of a repeated measures design. Study sample Oculomotor results from a total of 62 participants were analyzed. Portions of these data have been presented in a previous research study. Group 1 consisted of twenty-nine 4- to 6-yr-olds with an average age of 4.86 (SD = 0.88) yr. Group 2 consisted of thirty-three 22- to 44-yr-olds with an average age of 25.2 (SD = 5.34) yr. Data collection and analysis Raw oculomotor recordings were analyzed "offline" by a single masked, trained investigator. Each tracing was evaluated for instances of artifact including eye blinks, eye closure, eyes moving in opposite direction of the target, eye tracking software problems, and overall poor morphology. The number of instances of artifact were noted and recorded for each participant in both groups. Individual eye movements not affected by artifact were included for final analysis. Artifact rejection techniques were also compared. Results The results indicated increased artifact for the pediatric group for saccade and smooth pursuit testing. Additionally, a significant decrease in instances of artifact was noted with an increase in age in months for both saccade and smooth pursuit findings. OPK results did not indicate any significant difference in instances of artifact between the pediatric and adult groups or any decrease in instances of artifact with increasing age in the pediatric group. Artifact rejection technique did not have a significant effect on oculomotor measures for either age group. Conclusions Pediatric patients exhibit increased instances of artifact during VNG oculomotor testing, specifically during saccade and smooth pursuit testing, at least for the 4- to 6-yr-old population. A general age effect was also noted in this age group, with decreased artifact noted with increasing age. Artifact rejection technique was not a significant factor suggesting standard compared based strategies may be sufficient for use in the pediatric population. Additional study into the effect of artifact on oculomotor results for infants to age 3 yr and ages 7- to 18-yr-old, in the disordered population, and with additional equipment manufacturers is needed to confirm these results and further describe the impact of artifact on oculomotor findings in the pediatric population.
-
Electronystagmography and Videonystagmography(ENG/VNG): E-Book
2016Co-Authors: Devin L. MccaslinAbstract:Electronystagmography and Videonystagmography(ENG/VNG): E-Book , Electronystagmography and Videonystagmography(ENG/VNG): E-Book , کتابخانه دیجیتال جندی شاپور اهواز
-
electronystagmography and Videonystagmography eng vng e book
2016Co-Authors: Devin L. MccaslinAbstract:Electronystagmography and Videonystagmography(ENG/VNG): E-Book , Electronystagmography and Videonystagmography(ENG/VNG): E-Book , کتابخانه دیجیتال جندی شاپور اهواز
-
the dissociation of video head impulse test vhit and bithermal caloric test results provide topological localization of vestibular system impairment in patients with definite meniere s disease
American Journal of Audiology, 2015Co-Authors: Devin L. Mccaslin, Gary P. Jacobson, Alejandro Rivas, Marc L BennettAbstract:Purpose We report 3 patients with Meniere's disease and describe how the combination of audiometry, video head impulse testing, and caloric results may prove helpful in the diagnosis of Meniere's disease. Method Three patients with “definite” Meniere's disease were evaluated in a tertiary care medical center. Each patient underwent Videonystagmography, horizontal canal video head impulse testing, and audiometry. Results All 3 patients demonstrated moderate, flat, sensorineural hearing losses; significant caloric asymmetries; and bilaterally normal video head impulse testing. This pattern of findings suggests differential preservation of high-frequency function (video head impulse testing) with impairment of low-frequency function (unilaterally abnormal caloric test results) in these patients. Conclusion Ipsilesional abnormal caloric testing in the presence of normal video head impulse testing is a pattern of findings observed in a cohort of patients who have “definite” Meniere's disease.
Jurek Olszewski - One of the best experts on this subject based on the ideXlab platform.
-
Original Article Comparison of water and air caloric stimulation using Videonystagmography
2016Co-Authors: Anna Jałocha-kaczka, Jurek Olszewski, Joanna Urbaniak, Piotr PietkiewiczAbstract:Introduction: The basic methods for assessing the vestibular system are the caloric tests, which can be performed using air or water stimulation. The aim of the study was to compare the parameters of nystagmus provoked during air caloric stimulation with the parameters obtained during water caloric stimulation in subjects with and without vertigo. Material and methods: The study included 102 subjects divided into two groups: Group I-patients with peripheral or mixed vertigo, Group II-healthy individuals without vertigo. Two caloric tests were carried out in all subjects: air stimulation (30°C, 44°C, application time: 45 seconds) and water stimulation (30°C, 44°C, application time: 30 seconds). The obtained parameters of nystagmus were analyzed using Videonystagmography (VNG). Results: There were statistically significant differences concerning the angular velocity of the slow nystagmus phase as well as nystagmus frequency and excitability during water and air caloric stimulation in both groups. No significant difference in vestibular deficit was observed in relation to the applied stimulus. Conclusions: The results clearly show that water caloric stimulation produces considerably stronger reactions than air caloric stimulation. Despite significant differences in the values of individual parameters of nystagmus, both tests can be successfully used to evaluate vestibular system function.
-
The use of Videonystagmography head impulse test (VHIT) in the diagnostics of semicircular canal injuries in patients with vertigo
International journal of occupational medicine and environmental health, 2014Co-Authors: Jarosław Miłoński, Piotr Pietkiewicz, Marzena Bielińska, Krzysztof Kuśmierczyk, Jurek OlszewskiAbstract:Objectives The aim of the study was to assess the function of semicircular canal in Videonystagmography head impulse test (VHIT) in the patients with vertigo and balance disorders.
-
Electronystagmography versus Videonystagmography in diagnosis of vertigo
International Journal of Occupational Medicine and Environmental Health, 2012Co-Authors: Piotr Pietkiewicz, Renata Pepaś, Wiesław J Sułkowski, Hanna Zielińska-bliźniewska, Jurek OlszewskiAbstract:Objectives Vertigo is a very common symptom mainly caused by the lesion of vestibular system (peripheral or central) and often accompanied by some work-related diseases and occupational intoxications. The aim of this study was to assess the value of electronystagmography (ENG) and Videonystagmography (VNG) for diagnosing vertigo of various origin. Materials and Methods The study included four groups, 25 subjects each, of patients suffering from vestibular disorders of peripheral, central and mixed origin versus healthy controls. All were examined by means of ENG and VNG, using the bithermal caloric test with 30°C and 44°C air irrigations of the ears. The findings (frequency of induced nystagmus FRQ, its slow phase velocity SPV, canal paresis CP, directional preponderance DP, vestibular excitability VE) were analysed and compared. Results In all patients with vertigo due to vestibular neuritis, barotrauma and kinetosis, significant CP, the important sign of peripheral site of vestibular lesion was identified both in ENG and VNG. None of the patients with central origin disorders showed CP in VNG; in the majority of cases DP was observed. However, in ENG we found CP in 5 patients with central origin disorders. There were no essential differences between ENG and VNG in measurements of FRQ and SPV except for higher values in VNG in controls and patients with mixed vertigo. Conclusions The results suggest that the VNG should be recommended in preference as the valuable method to assess vertigo and to discriminate between the peripheral and the central vestibular lesions.
-
Electronystagmography versus Videonystagmography in diagnosis of vertigo.
International journal of occupational medicine and environmental health, 2012Co-Authors: Piotr Pietkiewicz, Renata Pepaś, Wiesław J Sułkowski, Hanna Zielińska-bliźniewska, Jurek OlszewskiAbstract:Objectives Vertigo is a very common symptom mainly caused by the lesion of vestibular system (peripheral or central) and often accompanied by some work-related diseases and occupational intoxications. The aim of this study was to assess the value of electronystagmography (ENG) and Videonystagmography (VNG) for diagnosing vertigo of various origin.
-
zastosowanie testu vhit Videonystagmography head impulse test w diagnostyce uszkodzen kanalow polkolistych
Otolaryngologia Polska, 2010Co-Authors: Jurek Olszewski, Piotr Pietkiewicz, Jaroslaw Milonski, Marzena BielińskaAbstract:Summary Introduction The aim of that work was to evaluate the usefulness of VHIT (Videonystagmography Head Impulse Test) in the diagnostics of injuries to the semicircular canals. Material and methods The tests covered 58 patients aged 20–27, including 34 women and 24 men. Any deviations within the vestibular organs was excluded in the interview, otorhinolaryngological examination and full videonystagmographic test. The tests checked functions of the semicircular canals in the following way: in a sitting position and the head leaned forward at 30° the patient was looking at a motionless point while quick movements to the left or right were performed to stimulate a particular lateral semicircular canal. When the vertical semicircular canals were tested the head was inclined laterally to the right side at 45°. Then similar movements were performed forwards (stimulation of the left anterior semicircular canal) and backwards (stimulation of the right posterior semicircular canal). When the head was leaned laterally to the left at 45° the right or left anterior semicircular canal was stimulated respectively. Functions of the canal were determined on the basis of gain (%). Results of the tests In 58 patients the gain value for particular semicircular canals was normal, and the mean values presented as follows: the lateral semicircular canal: 11.9%±10.2, the anterior semicircular canal: 17.5%±11.6 and the posterior semicircular canal: 19.2%±13.5, whereas on the left side: 10.3%±7.9, 18.1%±11.1, 15.1%±12.3 respectively. In one man the gain value for the right posterior semicircular canal was found significantly above the standard value – 71%. Conclusion VHIT showed much more sensitive than a full videonystagmographic test.
Piotr Pietkiewicz - One of the best experts on this subject based on the ideXlab platform.
-
Original Article Comparison of water and air caloric stimulation using Videonystagmography
2016Co-Authors: Anna Jałocha-kaczka, Jurek Olszewski, Joanna Urbaniak, Piotr PietkiewiczAbstract:Introduction: The basic methods for assessing the vestibular system are the caloric tests, which can be performed using air or water stimulation. The aim of the study was to compare the parameters of nystagmus provoked during air caloric stimulation with the parameters obtained during water caloric stimulation in subjects with and without vertigo. Material and methods: The study included 102 subjects divided into two groups: Group I-patients with peripheral or mixed vertigo, Group II-healthy individuals without vertigo. Two caloric tests were carried out in all subjects: air stimulation (30°C, 44°C, application time: 45 seconds) and water stimulation (30°C, 44°C, application time: 30 seconds). The obtained parameters of nystagmus were analyzed using Videonystagmography (VNG). Results: There were statistically significant differences concerning the angular velocity of the slow nystagmus phase as well as nystagmus frequency and excitability during water and air caloric stimulation in both groups. No significant difference in vestibular deficit was observed in relation to the applied stimulus. Conclusions: The results clearly show that water caloric stimulation produces considerably stronger reactions than air caloric stimulation. Despite significant differences in the values of individual parameters of nystagmus, both tests can be successfully used to evaluate vestibular system function.
-
The use of Videonystagmography head impulse test (VHIT) in the diagnostics of semicircular canal injuries in patients with vertigo
International journal of occupational medicine and environmental health, 2014Co-Authors: Jarosław Miłoński, Piotr Pietkiewicz, Marzena Bielińska, Krzysztof Kuśmierczyk, Jurek OlszewskiAbstract:Objectives The aim of the study was to assess the function of semicircular canal in Videonystagmography head impulse test (VHIT) in the patients with vertigo and balance disorders.
-
Electronystagmography versus Videonystagmography in diagnosis of vertigo
International Journal of Occupational Medicine and Environmental Health, 2012Co-Authors: Piotr Pietkiewicz, Renata Pepaś, Wiesław J Sułkowski, Hanna Zielińska-bliźniewska, Jurek OlszewskiAbstract:Objectives Vertigo is a very common symptom mainly caused by the lesion of vestibular system (peripheral or central) and often accompanied by some work-related diseases and occupational intoxications. The aim of this study was to assess the value of electronystagmography (ENG) and Videonystagmography (VNG) for diagnosing vertigo of various origin. Materials and Methods The study included four groups, 25 subjects each, of patients suffering from vestibular disorders of peripheral, central and mixed origin versus healthy controls. All were examined by means of ENG and VNG, using the bithermal caloric test with 30°C and 44°C air irrigations of the ears. The findings (frequency of induced nystagmus FRQ, its slow phase velocity SPV, canal paresis CP, directional preponderance DP, vestibular excitability VE) were analysed and compared. Results In all patients with vertigo due to vestibular neuritis, barotrauma and kinetosis, significant CP, the important sign of peripheral site of vestibular lesion was identified both in ENG and VNG. None of the patients with central origin disorders showed CP in VNG; in the majority of cases DP was observed. However, in ENG we found CP in 5 patients with central origin disorders. There were no essential differences between ENG and VNG in measurements of FRQ and SPV except for higher values in VNG in controls and patients with mixed vertigo. Conclusions The results suggest that the VNG should be recommended in preference as the valuable method to assess vertigo and to discriminate between the peripheral and the central vestibular lesions.
-
Electronystagmography versus Videonystagmography in diagnosis of vertigo.
International journal of occupational medicine and environmental health, 2012Co-Authors: Piotr Pietkiewicz, Renata Pepaś, Wiesław J Sułkowski, Hanna Zielińska-bliźniewska, Jurek OlszewskiAbstract:Objectives Vertigo is a very common symptom mainly caused by the lesion of vestibular system (peripheral or central) and often accompanied by some work-related diseases and occupational intoxications. The aim of this study was to assess the value of electronystagmography (ENG) and Videonystagmography (VNG) for diagnosing vertigo of various origin.
-
zastosowanie testu vhit Videonystagmography head impulse test w diagnostyce uszkodzen kanalow polkolistych
Otolaryngologia Polska, 2010Co-Authors: Jurek Olszewski, Piotr Pietkiewicz, Jaroslaw Milonski, Marzena BielińskaAbstract:Summary Introduction The aim of that work was to evaluate the usefulness of VHIT (Videonystagmography Head Impulse Test) in the diagnostics of injuries to the semicircular canals. Material and methods The tests covered 58 patients aged 20–27, including 34 women and 24 men. Any deviations within the vestibular organs was excluded in the interview, otorhinolaryngological examination and full videonystagmographic test. The tests checked functions of the semicircular canals in the following way: in a sitting position and the head leaned forward at 30° the patient was looking at a motionless point while quick movements to the left or right were performed to stimulate a particular lateral semicircular canal. When the vertical semicircular canals were tested the head was inclined laterally to the right side at 45°. Then similar movements were performed forwards (stimulation of the left anterior semicircular canal) and backwards (stimulation of the right posterior semicircular canal). When the head was leaned laterally to the left at 45° the right or left anterior semicircular canal was stimulated respectively. Functions of the canal were determined on the basis of gain (%). Results of the tests In 58 patients the gain value for particular semicircular canals was normal, and the mean values presented as follows: the lateral semicircular canal: 11.9%±10.2, the anterior semicircular canal: 17.5%±11.6 and the posterior semicircular canal: 19.2%±13.5, whereas on the left side: 10.3%±7.9, 18.1%±11.1, 15.1%±12.3 respectively. In one man the gain value for the right posterior semicircular canal was found significantly above the standard value – 71%. Conclusion VHIT showed much more sensitive than a full videonystagmographic test.
Carmen C Brewer - One of the best experts on this subject based on the ideXlab platform.
-
vestibular dysfunction in patients with enlarged vestibular aqueduct
Otolaryngology-Head and Neck Surgery, 2014Co-Authors: Chris Zalewski, Wade W Chien, Kelly A King, Julie A Muskett, Rachel E Baron, John A Butman, Andrew J Griffith, Carmen C BrewerAbstract:ObjectiveEnlarged vestibular aqueduct (EVA) is the most common inner ear malformation. While a strong correlative relationship between EVA and hearing loss is well established, its association with vestibular dysfunction is less well understood. In this study, we examine the effects of EVA on the vestibular system in patients with EVA.Study DesignProspective, cross-sectional study of a cohort ascertained between 1999 and 2013.SettingNational Institutes of Health Clinical Center, a federal biomedical research facility.Subjects and MethodsIn total, 106 patients with unilateral or bilateral EVA, defined as a midpoint diameter greater than 1.5 mm, were referred or self-referred to participate in a study of the clinical and molecular aspects of EVA. Clinical history was ascertained with respect to the presence or absence of various vestibular signs and symptoms and history of head trauma. Videonystagmography (VNG), cervical vestibular evoked myogenic potential (cVEMP), and rotational vestibular testing (RVT) w...
Wade W Chien - One of the best experts on this subject based on the ideXlab platform.
-
vestibular dysfunction in patients with enlarged vestibular aqueduct
Otolaryngology-Head and Neck Surgery, 2014Co-Authors: Chris Zalewski, Wade W Chien, Kelly A King, Julie A Muskett, Rachel E Baron, John A Butman, Andrew J Griffith, Carmen C BrewerAbstract:ObjectiveEnlarged vestibular aqueduct (EVA) is the most common inner ear malformation. While a strong correlative relationship between EVA and hearing loss is well established, its association with vestibular dysfunction is less well understood. In this study, we examine the effects of EVA on the vestibular system in patients with EVA.Study DesignProspective, cross-sectional study of a cohort ascertained between 1999 and 2013.SettingNational Institutes of Health Clinical Center, a federal biomedical research facility.Subjects and MethodsIn total, 106 patients with unilateral or bilateral EVA, defined as a midpoint diameter greater than 1.5 mm, were referred or self-referred to participate in a study of the clinical and molecular aspects of EVA. Clinical history was ascertained with respect to the presence or absence of various vestibular signs and symptoms and history of head trauma. Videonystagmography (VNG), cervical vestibular evoked myogenic potential (cVEMP), and rotational vestibular testing (RVT) w...
