Studies on habituation of vestibular reflexes: Effect of repetitive caloric tests.

1961 ◽  
Author(s):  
N. G. Henriksson ◽  
K. Kohut ◽  
C. Fernandez
Keyword(s):  
Vestibular Reflexes ◽  
Caloric Tests

Vestibular Function and Motion Sickness Susceptibility: Videonystagmographic Evidence From Oculomotor and Caloric Tests

2020 ◽  
Vol 29 (2) ◽  
pp. 188-198
Author(s):  
Cynthia G. Fowler ◽  
Margaret Dallapiazza ◽  
Kathleen Talbot Hadsell
Keyword(s):  
Phase Velocity ◽  
Motion Sickness ◽  
Repeated Measures ◽  
Short Form ◽  
Vestibular Function ◽  
Slow Phase ◽  
Test Results ◽  
Normal Range ◽  
Slow Phase Velocity ◽  
Caloric Tests

Purpose Motion sickness (MS) is a common condition that affects millions of individuals. Although the condition is common and can be debilitating, little research has focused on the vestibular function associated with susceptibility to MS. One causal theory of MS is an asymmetry of vestibular function within or between ears. The purposes of this study, therefore, were (a) to determine if the vestibular system (oculomotor and caloric tests) in videonystagmography (VNG) is associated with susceptibility to MS and (b) to determine if these tests support the theory of an asymmetry between ears associated with MS susceptibility. Method VNG was used to measure oculomotor and caloric responses. Fifty young adults were recruited; 50 completed the oculomotor tests, and 31 completed the four caloric irrigations. MS susceptibility was evaluated with the Motion Sickness Susceptibility Questionnaire–Short Form; in this study, percent susceptibility ranged from 0% to 100% in the participants. Participants were divided into three susceptibility groups (Low, Mid, and High). Repeated-measures analyses of variance and pairwise comparisons determined significance among the groups on the VNG test results. Results Oculomotor test results revealed no significant differences among the MS susceptibility groups. Caloric stimuli elicited responses that were correlated positively with susceptibility to MS. Slow-phase velocity was slowest in the Low MS group compared to the Mid and High groups. There was no significant asymmetry between ears in any of the groups. Conclusions MS susceptibility was significantly and positively correlated with caloric slow-phase velocity. Although asymmetries between ears are purported to be associated with MS, asymmetries were not evident. Susceptibility to MS may contribute to interindividual variability of caloric responses within the normal range.

Caloric Tests

1984 ◽  
Vol 92 (6) ◽  
pp. 662-670 ◽  
Author(s):  
Cecil W. Hart
Keyword(s):  
Caloric Tests

Caloric Tests on Platform: “Paradoxical Responsiveness”

1995 ◽  
Vol 115 (sup520) ◽  
pp. 437-439
Author(s):  
Andrée M. T. Hadj-Djilani
Keyword(s):  
Caloric Tests

The impact of vestibular symptoms and electronystagmography results on recovery from sudden sensorineural hearing loss

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Gaelle Vofo ◽  
Marrigje Aagje de Jong ◽  
Michal Kaufman ◽  
Julia Meyler ◽  
Ron Eliashar ◽  
...  
Keyword(s):  
Hearing Loss ◽  
Sensorineural Hearing Loss ◽  
Small Sample Size ◽  
Small Sample ◽  
Sudden Sensorineural Hearing Loss ◽  
Sensorineural Hearing ◽  
Caloric Test ◽  
Routine Identification ◽  
The Impact ◽  
Caloric Tests

Abstract Objectives Idiopathic sudden sensorineural hearing loss (SSNHL) represents a frequently encountered otological entity, of various types and severity, with an array of associated symptoms including vertigo. This is a devastating life-changing condition with a blurry prognosis. The objective of this study was to determine the clinical association of vestibular impairment by electronystagmography (ENG) and caloric tests, and their ability to predict prognosis. Methods An observational, crossectional study was carried out amongst patients admitted with SSNHL. Each consenting patient had an audiometry test performed on admission as well as ENG and caloric tests. Treatment included oral steroids and carbogen with intratympanic steroids used only as salvage treatment. Follow-up was completed after 6 months when hearing gains were evaluated. Finally, an association was sought between the rate of recovery and ENG and caloric test results. Results Of 35 patients included, marked recovery was seen in patients without vertigo when compared to those with vertigo (p=0.003). A statistically significant association was found between the presence of vertigo and hearing deterioration (p=0.008). More so, normal electronystagmography results were associated with marked recovery (p=0.04). Conclusions The vestibular end organs are both subjectively and objectively affected in SSNHL as demonstrated by the abnormal ENG and caloric tests in our study despite the small sample size. Concomitant vestibular involvement carries poorer prognosis and routine identification may help foresee the recovery of patients with SSNHL and as such, aid in patient counseling. ENG and caloric tests are easily available and may be recommended for all patients with SSNHL.

Dynamics of neck-to-forelimb reflexes in the decerebrate cat

1983 ◽  
Vol 50 (3) ◽  
pp. 688-695 ◽  
Author(s):  
K. Ezure ◽  
V. J. Wilson
Keyword(s):  
Head Rotation ◽  
Longitudinal Axis ◽  
Triceps Brachii ◽  
Vestibular Reflexes ◽  
Sinusoidal Analysis ◽  
Low Frequencies ◽  
Decerebrate Cat ◽  
Splenius Capitis ◽  
Response Phase ◽  
Stimulation Of

We have studied the neck-to-forelimb reflex evoked by head rotation around the longitudinal axis (roll) in the long and medial heads of triceps brachii of decerebrate, acutely labyrinthectomized cats. Reflexes were measured by recording mass electromyogram (EMG). As expected from the work of others, they were reciprocal in the two limbs, with excitation in the limb toward which the chin rotates. The reflex was sufficiently linear for a sinusoidal analysis. Although there was sometimes adaptation at stimulus frequencies of 0.1 Hz and below, response phase at these frequencies was usually in phase with position, and gain was flat. At higher frequencies there was some sensitivity to the velocity of the stimulus: gain increased with a slope of 10 dB/decade and phase advanced in some cats but not in others. Gain at low frequencies of head rotation, expressed as percent modulation of EMG, was typically 1%/deg or less. Reflexes evoked by head rotation in triceps and in the neck extensor splenius capitis have different dynamics. It remains to be determined whether this difference is due to activation of different receptors. We compared the dynamics of roll reflexes evoked by stimulation of neck receptors with those of vestibular reflexes evoked by tilt of the whole animal (23). Taking into account dynamics and gain, the two reflexes should cancel at low frequencies, as predicted by others. Above 0.2 Hz, cancellation becomes less effective.

Caloric Tests In Deaf Children

1965 ◽  
Vol 81 (4) ◽  
pp. 350-354 ◽  
Author(s):  
L. E. SANDBERG ◽  
K. TERKILDSEN
Keyword(s):  
Deaf Children ◽  
Caloric Tests

Prognosis of Inner Ear Periphery and Central Vestibular Plasticity in Sudden Deafness with Vertigo

2005 ◽  
Vol 114 (10) ◽  
pp. 786-791 ◽  
Author(s):  
Tadashi Kitahara ◽  
Noriaki Takeda ◽  
Suetaka Nishiike ◽  
Shin-Ichi Okumura ◽  
Takeshi Kubo
Keyword(s):  
Everyday Life ◽  
Inner Ear ◽  
Pure Tone ◽  
Vestibular Function ◽  
The Other ◽  
Sudden Deafness ◽  
Vestibular Neurectomy ◽  
Canal Paresis ◽  
Clinical Problems ◽  
Caloric Tests

Objectives: We sought to elucidate the clinical problems and otopathology of patients with sudden deafness with vertigo (SDV). Methods: In 24 patients with SDV who had significant canal paresis (CP) at their first visit to our hospital between 1997 and 2001, we examined pure tone audiograms, caloric tests, and several questionnaires twice, at the first visit within 5 days after the onset and around 2 years after steroid therapy. Results: These examinations revealed that improvements of auditory and vestibular function in patients with SDV tended to be correlated with one another. Sixteen of the 24 patients (66.7%) still had CP. This rate in SDV was significantly worse than that reported previously for vestibular neuritis (VN). On the other hand, patients with SDV with long-lasting CP had a faster reduction of head-shaking afternystagmus and of handicaps in their everyday life due to dizziness than did patients with VN and CP. Conclusions: These findings suggest that SDV may deteriorate the inner ear function more severely but accelerate the central vestibular compensation more effectively than VN after the lesion. It is well known that vestibular neurectomy causes much more severe motion-induced dizziness after surgery than does labyrinthectomy. Taken together, these findings suggest different regions of damage in SDV (mainly the labyrinth, as in labyrinthectomy) and VN (mainly the ganglion, as in vestibular neurectomy).

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