No abstract available.
Reference Values* ; Vestibular Function Tests*

The initial severe and disabling symptoms of vestibular dysfunction diminish gradually by a process of compensation. Although the process is complex and not fully understood, knowledge of the extent of compensation makes physicians to identify the causes and to determine treatment choices of the dysfunction. In this report we present 2 common cases of peripheral vestibulopathy that result from different disease processes, and review the physiologic and functional changes as the compensation proceeds that can be evaluated by vestibular function tests including electronystagmography(ENG), rotation chair, and dynamic posturography. These tests are valuable tools in the assessment of the degree of compensation as well as the side and site of lesions in vestibulopathy.
Compensation and Redress* ; Vestibular Function Tests

No abstract available.
Meniere Disease ; Vestibular Function Tests

BACKGROUND AND OBJECTIVES: There are caloric test, SCEP, DP in Step velocity and VOR asymmetry in SHA test as parameters for evaluation in unilateral peripheral vestibulopathy in parameter of vestibular function test. The aim of this study is to assess the correlation between these parameters and intensity of spontaneous nystagmus in vestibular neuritis. MATERIALS AND METHOD: We evaluated 75 patients who were diagnosed as vestibular neuritis with 3 degree spontaneous nystagmus at vestibular function test lab from January 2000 to July 2005 in Dankook university hospital. The correlations between direction and intensity of spontaneous nystagmus and monothermal caloric test, SCEP and DP in step velocity, VOR asymmetry (0.01, 0.04, 0.16 Hz) in SHA test were analysed. And correlations according to sex, age were also analysed. RESULTS: The correlation coefficient between intensity of spontaneous nystagmus and monothermal caloric test was 0.60. The correlation coefficient between intensity of spontaneous nystagmus and SCEP was 0.35. The correlation coefficient between intensity of spontaneous nystagmus and Tc DP was 0.36 and it showed no significant correlation. The correlation coefficient between intensity of spontaneous nystagmus and VOR asymmetry (0.01, 0.04, 0.16) was 0.57, 0.46, 0.51, respectively and there was higher correlation in man, age under 60. CONCLUSION: Intensity of spontaneous nystagmus showed close relations to monothermal caloric test, VOR asymmetry of SHA, Tc DP, SCEP DP in sequence. In addition, young male patients tends to be closely related to intensity of spontaneous nystagmus.
Caloric Tests ; Humans ; Male ; Vestibular Function Tests* ; Vestibular Neuronitis*

Electronystagmography ; Humans ; Postural Balance ; Vestibular Function Tests

Humans ; Vertigo ; diagnosis ; physiopathology ; Vestibular Function Tests

OBJECTIVE: To find out whether there is correlation between result of VEMP and vestibular ratio of posturography, and also to investigate if VEMP can show diagnostic efficiency in patients with vertigo. METHOD: Thirty-two patients whose BAEP test showed normal latency were included after patients whose somatosensory ratio and visual ratio from posturography showed abnormality were excluded. Ten healthy participants were set up as control group. We made comparison between P13 latency in VEMP and vestibular ratio posturography among these participants. RESULTS: Among the participants 47% showed normal P13 latency, and 53% showed abnormal P13 latency. In normal P13 latency group, 86.7% of patients showed normal vestibular ratio, and in abnormal P13 latency group, 70.6% of patients showed abnormal vestibular ratio. CONCLUSION: VEMP showed high correlation between vestibular ratio of posturography. VEMP can be used in screening test and clinically complementary diagnostic method of vestibular function test for patients with vertigo.
Humans ; Mass Screening ; Vertigo ; Vestibular Function Tests

BACKGROUND AND OBJECTIVES: Vestibular evoked myogenic potentials (VEMP) test provides a useful method for assessment of saccule function and the functional integrity of the inferior vestibular nerve, and subjective visual vertical (SVV) abnormalities are presumably related to a lesion of the utricle. The aim(s) of this study were to measure otolith function using SVV and VEMP tests, and to define the influence of the otolithic organs in patients suffering from vestibular neuritis. MATERIALS AND METHOD: From September 2005 to January 2006, twelve patients who received treatment in hospital and also had been tested for caloric test, subjective visual vertical (SVV) and vestibular evoked myogenic potential (VEMP) tests with unilateral vestibular neuritis were enrolled. All the tests were done within 8 days after the onset of their symptoms, simultaneously. The SVV was measured in 34 normal subjects as well as in patients. RESULTS: Eight of 12 patients showed abnormal tilt to the lesion side in SVV test, and five of 8 patients showed no VEMP on the affected side. There was no correlation between SVV tilts and unilateral weakness (UW) in caloric tests. Two patients with abnormal UW (54, 82%) showed normal finding in SVV & VEMP tests. One patient with abnormal UW (83%) and SVV tilts (18.04Degree) to the lesion side was normal in VEMP test. Two patients with abnormal UW (28, 37%) and no response in VEMP test were normal in SVV test. CONCLUSION: Our results demonstrate that the incidence of abnormal results were 62.5, 66.7% in VEMP and SVV tests in acute stage of vestibular neuritis, respectively. There was no correlation between the abnormal results of the tests and these findings suggest that impairment of the otolithic function is depending on the extent and/or the localization of vestibular neuritis.
Caloric Tests ; Humans ; Incidence ; Otolithic Membrane* ; Saccule and Utricle ; Vestibular Evoked Myogenic Potentials ; Vestibular Function Tests ; Vestibular Nerve ; Vestibular Neuronitis*

BACKGROUND AND OBJECTIVES: Vestibular evoked myogenic potentials (VEMP) test provides a useful method for assessment of saccule function and the functional integrity of the inferior vestibular nerve, and subjective visual vertical (SVV) abnormalities are presumably related to a lesion of the utricle. The aim(s) of this study were to measure otolith function using SVV and VEMP tests, and to define the influence of the otolithic organs in patients suffering from vestibular neuritis. MATERIALS AND METHOD: From September 2005 to January 2006, twelve patients who received treatment in hospital and also had been tested for caloric test, subjective visual vertical (SVV) and vestibular evoked myogenic potential (VEMP) tests with unilateral vestibular neuritis were enrolled. All the tests were done within 8 days after the onset of their symptoms, simultaneously. The SVV was measured in 34 normal subjects as well as in patients. RESULTS: Eight of 12 patients showed abnormal tilt to the lesion side in SVV test, and five of 8 patients showed no VEMP on the affected side. There was no correlation between SVV tilts and unilateral weakness (UW) in caloric tests. Two patients with abnormal UW (54, 82%) showed normal finding in SVV & VEMP tests. One patient with abnormal UW (83%) and SVV tilts (18.04Degree) to the lesion side was normal in VEMP test. Two patients with abnormal UW (28, 37%) and no response in VEMP test were normal in SVV test. CONCLUSION: Our results demonstrate that the incidence of abnormal results were 62.5, 66.7% in VEMP and SVV tests in acute stage of vestibular neuritis, respectively. There was no correlation between the abnormal results of the tests and these findings suggest that impairment of the otolithic function is depending on the extent and/or the localization of vestibular neuritis.
Caloric Tests ; Humans ; Incidence ; Otolithic Membrane* ; Saccule and Utricle ; Vestibular Evoked Myogenic Potentials ; Vestibular Function Tests ; Vestibular Nerve ; Vestibular Neuronitis*

BACKGROUND AND OBJECTIVES: Vestibular function tests are very useful in diagnosing dizzy patients. Among them, bithermal caloric test is most commonly used test for localizing their permanent vestibular loss. However, it causes much discomfort to the patients with non-physiologic stimuli. In addition, it doesn't represent the present functional status of vestibular system. Therefore, normal caloric result does not accurately correspond to normal vestibular function in dizzy patients. Currently, rotation chair test and dynamic posturography have been introduced adjunctly to assess vestibular function accompanied by bithermal caloric test. It has not been elucidated for their specific role in diverse settings of vestibular disorders. So we planned this study to evaluate clinical usefulness of rotation chair test, videonystagmography and computerized dynamic posturogr-phy in dizzy patients with normal caloric response. MATERIALS AND METHODS: We reviewed clinical records of 46 patients who met their inclusion criteria. They were categorized into five subgroups according to abnormal vestibular function test findings. RESULTS: In each subgroup, we hypothesized its clinical relevance, possible mechanism of dizz-iness and presumed diagnosis. Five categories are as below; visual dependency, imbalance of vestibular tones, chronic peripheral vestibulopathy, abnormality in the vestibulospinal tract and abnormality of oculomotor system. CONCLUSION: We suggest new classification of abnormal vestibular functional status in dizzy patients with normal caloric results. These are comparable according their clinical features and thought to be helpful in managing and counseling each patient.
Caloric Tests ; Counseling ; Dependency (Psychology) ; Humans ; Vestibular Function Tests