Neurotoxicity of mercury sulfide in the vestibular ocular reflex system of guinea pigs

2001 ◽  
Vol 364 (3) ◽  
pp. 249-258 ◽  
Author(s):  
Jiunn-Jye Chuu ◽  
Yi-Ho Young ◽  
Shing-Hwa Liu ◽  
Shoei-Yn Lin-Shiau
Keyword(s):  
Guinea Pigs ◽  
Mercury Sulfide ◽  
Ocular Reflex ◽  
Vestibular Ocular Reflex ◽  
Reflex System

Premorbid migraine history as a risk factor for vestibular and oculomotor baseline concussion assessment in pediatric athletes

2019 ◽  
Vol 23 (4) ◽  
pp. 465-470 ◽  
Author(s):  
Ryan N. Moran ◽  
Tracey Covassin ◽  
Jessica Wallace
Keyword(s):  
Risk Factor ◽  
Smooth Pursuit ◽  
Migraine Headache ◽  
Visual Motion ◽  
Assessment Tools ◽  
Motion Sensitivity ◽  
Ocular Reflex ◽  
Migraine Headaches ◽  
Vestibular Ocular Reflex ◽  
History Of

OBJECTIVEMigraine history has recently been identified as a risk factor for concussion and recovery. The authors performed a cross-sectional study examining baseline outcome measures on newly developed and implemented concussion assessment tools in pediatrics. The purpose of this study was to examine the effects of premorbid, diagnosed migraine headaches as a risk factor on vestibular and oculomotor baseline assessment in pediatric athletes.METHODSPediatric athletes between the ages of 8 and 14 years with a diagnosed history of migraine headache (n = 28) and matched controls without a history of diagnosed migraine headache (n = 28) were administered a baseline concussion assessment battery, consisting of the Vestibular/Ocular Motor Screening (VOMS), near point of convergence (NPC), and the King-Devick (K-D) tests. Between-groups comparisons were performed for vestibular symptoms and provocation scores on the VOMS (smooth pursuit, saccades, convergence, vestibular/ocular reflex, visual motion sensitivity), NPC (average distance), and K-D (time).RESULTSIndividuals diagnosed with migraine headaches reported greater VOMS smooth pursuit scores (p = 0.02), convergence scores (p = 0.04), vestibular ocular reflex scores (p value range 0.002–0.04), and visual motion sensitivity scores (p = 0.009). Differences were also observed on K-D oculomotor performance with worse times in those diagnosed with migraine headache (p = 0.02). No differences were reported on NPC distance (p = 0.06) or headache symptom reporting (p = 0.07) prior to the VOMS assessment.CONCLUSIONSPediatric athletes diagnosed with migraine headaches reported higher baseline symptom provocation scores on the VOMS. Athletes with migraine headaches also performed worse on the K-D test, further illustrating the influence of premorbid migraine headaches as a risk factor for elevated concussion assessment outcomes at baseline. Special consideration may be warranted for post-concussion assessment in athletes with migraine headaches.

SOME THOUGHTS ABOUT THE THREE NEURONS IN THE VESTIBULAR OCULAR REFLEX

1981 ◽  
Vol 374 (1 Vestibular an) ◽  
pp. 171-188 ◽  
Author(s):  
R. Baker ◽  
C. Evinger ◽  
R. A. McCrea
Keyword(s):  
Ocular Reflex ◽  
Vestibular Ocular Reflex

scholarly journals Loss of Vestibular Ocular Reflex in Nonconvulsive Status Epilepticus

2018 ◽  
Vol 30 (3) ◽  
pp. 675-680
Author(s):  
Jennifer H. Kang ◽  
Aatif M. Husain ◽  
Joel C. Morgenlander
Keyword(s):  
Status Epilepticus ◽  
Nonconvulsive Status Epilepticus ◽  
Ocular Reflex ◽  
Vestibular Ocular Reflex

Analysis of Vestibular-Ocular Reflex by Evolutionary Framework

2008 ◽  
pp. 452-461
Author(s):  
Daniel Novák ◽  
Aleš Pilný ◽  
Pavel Kordík ◽  
Štefan Holiga ◽  
Petr Pošík ◽  
...  
Keyword(s):  
Ocular Reflex ◽  
Vestibular Ocular Reflex

scholarly journals Incremental Validity of Components of the Vestibular/Ocular Motor Screening for Concussion

2019 ◽  
Vol 34 (5) ◽  
pp. 769-769
Author(s):  
N Sandel Sherry ◽  
N Ernst ◽  
J Doman ◽  
C Holland ◽  
H Bitzer ◽  
...  
Keyword(s):  
Visual Motion ◽  
Symptomatic Patient ◽  
Incremental Validity ◽  
Ocular Motor ◽  
Final Model ◽  
Motion Sensitivity ◽  
Symptom Provocation ◽  
Ocular Reflex ◽  
Vestibular Ocular Reflex ◽  
Total Score Range

Abstract Purpose The Vestibular/Ocular Motor Screening (VOMS) tool for concussion evaluates symptom provocation (in a fixed order) across the following neuromotor tasks: smooth pursuits (SP), saccades-horizontal (Sac-H), saccades-vertical (Sac-V), near point of convergence (NPC), vestibular-ocular reflex-horizontal (VOR-H), vestibular-ocular reflex-vertical (VOR-V), and visual motion sensitivity (VMS). The current study evaluates the incremental validity of each VOMS component in consecutive order. Methods Retrospective record review of 193 subjects (49% male) aged 10–22 years old diagnosed with concussion (sport and non-sport injuries) and demonstrated an abnormal VOMS (defined by symptom provocation >2 or NPC >5cm) at initial evaluation in a specialty concussion clinic. Hierarchical regression was performed with VOMS total score (range: 0-320) as the dependent variable and each VOMS component as predictors in seven consecutive steps. Results The model was significant (p<.001) at each step; the final model including all seven VOMS components in order (SP, Sac-H, Sac-V, NPC, VOR-H, VOR-V, and VMS) was significant, F(7,185)= 6.87, p<.001 and accounted for 20.6% of the variance in total VOMS score. The only significant predictors in the final model included: SP (p=.01), NPC (p=.04), and VOR-H (p=.04). Conclusion Provocation of symptoms on SP, NPC, and VOR-H are the best predictors of total VOMS score. NPC and VOR-H symptom provocation provide unique value to vestibular screening beyond symptom provocation on SP and after completion of all other VOMS components. This information may be clinically useful when vestibular screening must be expedited (e.g., highly symptomatic patient, sideline assessment).

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