Vestibular Disorders Limited to the Vertical Semicircular Canals.

 The advent of the video head impulse test (vHIT) enables the study of each one of the six semicircular canals. In the present study, certain patients present disorders related only to the vertical semicircular canals, and they were carefully evaluated.  To investigate vestibular disorders limited to the vertical semicircular canals.

Neurotology: definitions and evidence-based therapies - Results of the I Brazilian Forum of Neurotology.

Introduction: Neurotology is a rapidly expanding field of knowledge. The study of the vestibular system has advanced so much that even basic definitions, such as the meaning of vestibular symptoms, have only recently been standardized.

Objective: To present a review of the main subjects of neurotology, including concepts, diagnosis and treatment of Neurotology, defining current scientific evidence to facilitate decision-making and to point out the most evidence-lacking areas to stimulate further new research.

Seasonality and solar radiation variation level in benign paroxysmal positional vertigo.

Background: Several studies have shown that the incidence of benign paroxysmal positional vertigo (BPPV) presents seasonal variations and there is evidence that the variation in time is dependent on the patient's amount of vitamin D.

Objectives: This is a retrospective study to verify if there is a correlation between the incidence of BPPV and the level of solar radiation, essential for the synthesis of vitamin D in the skin.

Material And Methods: This study comprised 214 patients with BPPV seen from 2012 to 2017, in a city Latitude: -30.

Normative data for static balance testing in healthy individuals using open source computerized posturography.

Purpose: Computerized posturography is the gold standard for balance assessment. Because of the great cost and dimensions of commercial equipments, low-cost and portable devices have been developed and validated, such as RombergLab, a software in open source term which works connected with a low-cost force platform. The objective of this study was to obtain normative posturography data using this software.

Behavior of the Posterior Semicircular Canal After Dix-Hallpike Maneuver.

The objective of the present study is to analyze the quantitative vestibulo-ocular responses in a group of patients with benign paroxysmal positional vertigo (BPPV) canalolithiasis and compare these data with the data of the tridimensional biomechanical model. This study was conducted on 70 patients that presented idiopathic posterior semicircular canal canalolithiasis. The diagnosis was obtained by Dix-Hallpike maneuvers recorded by videonystagmograph.

Assessment of the vestibuloocular reflex in fighter pilots with the video head impulse test.

Conclusion: There were no changes in the function of the six semicircular canals in active fighter pilots, through the use of the video head impulse test (vHIT). These results suggest that the vestibuloocular reflex (VOR) works well at the high frequencies related to the natural head movements in this population.

Objectives/hypothesis: The vestibular function in pilots has been reported as being different from that of other normal subjects.

The video head impulse test.

Conclusion: Additional research is needed to validate the importance of the video head impulse tests (vHIT), but it provides an important contribution to the evaluation of anterior and posterior semicircular canal disorders.

Objectives: To share observations of the vHIT test in clinical neurotology and to discuss the significance of the study findings.

Methods: This study comprised 200 patients with a clinical history of vestibular disturbances who were submitted to a vHIT including all six semicircular canals.

Assessing cochlear evoked potentials after electrocautery-induced trauma to the utricle.

Unlabelled: Utriculostomy is a new surgical alternative for Ménière's disease. The basis of this procedure is that the outcome of an electrocautery-induced utricular trauma does not affect cochlear function. However, a demonstration of the hypothesis that this approach to the utricle would preserve hearing is still pending.

Distortion product otoacoustic emissions in sheep before and after hyperinsulinemia induction.

Unlabelled: Transient evoked otoacoustic emissions and distortion product otoacoustic emissions have gained significant importance in the identification of cochlear alterations.

Aim: To record distortion product thresholds through the monitoring of otoacoustic emissions in normal conditions and in the presence of electrophysiologic changes in cochlear outer hair cells in sheep after hyperinsulinemia induction.

Material And Methods: Experimental study, with seven sheep in the control group and seven in the study group.